Date   
Re: Old Tektronix Books

 

Daniel,
Good for you!

It is my impression from watching scarce items like this that there are many companies that will advertise an item at an outrageous price even if they don't have it. They rely on finding some other company that claims to have it and then if you meet the price that justifies them actually hunting down a real copy the will do that and pocket the difference.

The reality is that all there needs to be is one copy and these companies make it appear that there may be more than one copy or even many. Daniel discovered that in the case of Stan's book there was only one copy. Now the price has jumped back into the stratosphere where it usually is.

I suspect there isn't more than one (or two at the most) of the Typical Oscilloscope Circuitry books either and now that Daniel bought one of them I think the price will skyrocket like Stan's book did.

Dennis Tillman W7PF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of
Daniel Koller via Groups.Io
Sent: Friday, March 29, 2019 9:45 AM
To: TekScopes <tekscopes@groups.io>
Subject: [TekScopes] Old Tektronix Books

Hi Folks,
The recent conversation about 500 series scopes prompted Dennis to
recommend two books,
"Oscilloscopes: Collecting and Restoring a Classic"; ISBN-13:
9780963307156; Publisher: Stanley A. Griffiths; Publication date:
01/28/1992;
"Typical Oscilloscope Circuitry", (C) 1961, 1962, Tektronix,
Inc., S. W. Millikan Way, P.O. Box 500, Beaverton, Oregon.

It occurred to me that though I have not *needed* those books to
repair my scopes in the past it sure would be nice to have a better
Idea on how the circuits work, and to be able to learn more about the
scopes in general, so I looked them up.
YESTERDAY, I was able to find a couple copies of Stan's book on
Amazon, used, for about $22. If I still have the website up at home
and it has not refreshed, I'll get a screen grab for proof, but there
were one or two copies available from at least two sources, through
Amazon. But TODAY, the least expensive copy is $94.09!! So, it
seems likely to me that this very discussion, within out closed group,
prompted someone to buy a book or two, and those actions drove up the
perceived demand on a limited resource to raise the price
significantly.
Question: Did anyone here, reading those messages yesterday go
ahead and buy Stan's book on line? What was your price and through
whom did you make the purchase? I sure HOPE that someone here bought
the book. Otherwise, I have a more nefarious theory; The bots are
actively scanning our conversations to manipulate the prices of things
on line. That is not a pleasant concept.
I found a copy through Moe's books for $28 and bought it. Let's
see how the price changes tomorrow.
As for the Tek book, "Typical Oscilloscope Circuitry", also found 3
copies in good condition for under $20 and bought one. We'll see
what happens to that as well.
I just figured I'd throw this out there as an FYI / buyer beware
sort of thing. Meanwhile, I am looking forward to some fun technical
reading!
Dan




--
Dennis Tillman W7PF
TekScopes Moderator

Re: I wonder if there is much interest in vacuum tube oscilloscopes such as the 500 series

Shirley Dulcey KE1L
 

That's the beauty of print on demand. If people buy the book you make
money, though less than with a conventional print run because the cost
per copy is a bit higher. If nobody buys the book you're out next to
no cash, though you did uselessly spend time preparing your book for a
PoD release. If your primary goal is to get your book out into the
world at a reasonable price for readers, it's a good option. That's
especially true for a reissue of an older book because the time spent
writing it is already gone; you're not up against the prospect of
spending a lot of time writing something and then not getting paid for
it.

The two big players in low cost PoD publishing are Lulu.com and
Amazon's Kindle Direct Publishing. (KDP also does ebook publishing, as
you might guess from the name. Amazon's former fully owned company,
CreateSpace, was merged into KDP a couple of years ago.) Both will let
you create books with zero up-front cost, though they also offer
optional services that cost money. (A third company, iUniverse,
started that way but later pivoted into being a more traditional
vanity press, aside from doing its business online.) The zero cost
option ONLY gets you printing; you're on your own for editing,
designing a cover, preparing your book for publication, promotion, and
getting bookstores and event dealers to carry your book. You can sell
your book at their base publishing cost, in which case you make
nothing on sales, or you can set a higher price and receive a portion
of the difference between the base cost and the selling price.

One complication with reprinting old books is that the author may not
own the rights. If the book was published by a conventional publisher,
that company or its successor may own some or all of the future
publication rights. If the company is defunct it can get complicated
to untangle who actually owns the rights to the book now; they could
belong to some person or company that bought pieces of the former
publisher's intellectual property, or they may have never been bought
by anybody and be in legal limbo.

On Fri, Mar 29, 2019 at 3:56 PM Dennis Tillman W7PF <@Dennis_Tillman_W7PF> wrote:

Hi Dave,
Stan brings up the issue of the outrageous prices used book sellers are asking for 2nd hand copies of his book whenever someone makes the mistake of asking if he has any copies left. He is stuck in a catch 22 situation. He would love to reprint it to get even with the used book stores but it took him over 10 years to sell the first printing. The last time I asked him about it he was resigned to the situation and not interested in doing anything about it.

The sad reality today is that it doesn't pay to print a book these days when someone is virtually certain to rip it off and scan it overnight. I sympathize since I often thought about writing a book on the 7000 Series.

Dennis Tillman W7PF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of
Dave Seiter
Sent: Friday, March 29, 2019 9:42 AM
To: TekScopes@groups.io
Subject: Re: [TekScopes] I wonder if there is much interest in vacuum
tube oscilloscopes such as the 500 series

Thanks, Dennis-
That was my understanding as well, which was why I was surprised
regarding the misconception that he was publishing his book again.
-Dave
On Friday, March 29, 2019, 7:45:48 AM PDT, Dennis Tillman W7PF
<@Dennis_Tillman_W7PF> wrote:

Hi Dave,
Stan is old. Stan has survived 2 or 3 bouts with cancer, a stroke, and
the recent loss of Pat, his spouse. So he doesn't have the energy he
used to. He does come to swapmeets where he sets up a table like he
always did. I visited him a few times last summer and fall. He is
getting frail but we went into his ham shack and puttered around for a
while looking for some things Pete Lancashire wanted.

Dennis Tillman W7PF

-----Original Message-----
From: Dave Seiter
Sent: Friday, March 29, 2019 1:33 AM

I haven't heard about Stan in a long time; he used to post quite a
lot. I think he had a few webcams, but they went dark long ago.
-Dave



--
Dennis Tillman W7PF
TekScopes Moderator





--
Dennis Tillman W7PF
TekScopes Moderator


Re: I wonder if there is much interest in vacuum tube oscilloscopes such as the 500 series

Dave Seiter
 

Same for musicians; I've heard that the only way they really make money these days is through t-shirt, etc sales.  
-Dave

On Friday, March 29, 2019, 12:56:12 PM PDT, Dennis Tillman W7PF <@Dennis_Tillman_W7PF> wrote:

Hi Dave,
Stan brings up the issue of the outrageous prices used book sellers are asking for 2nd hand copies of his book whenever someone makes the mistake of asking if he has any copies left. He is stuck in a catch 22 situation. He would love to reprint it to get even with the used book stores but it took him over 10 years to sell the first printing. The last time I asked him about it he was resigned to the situation and not interested in doing anything about it.

The sad reality today is that it doesn't pay to print a book these days when someone is virtually certain to rip it off and scan it overnight. I sympathize since I often thought about writing a book on the 7000 Series.

Dennis Tillman W7PF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of
Dave Seiter
Sent: Friday, March 29, 2019 9:42 AM
To: TekScopes@groups.io
Subject: Re: [TekScopes] I wonder if there is much interest in vacuum
tube oscilloscopes such as the 500 series

  Thanks, Dennis-
That was my understanding as well, which was why I was surprised
regarding the misconception that he was publishing his book again.
-Dave
    On Friday, March 29, 2019, 7:45:48 AM PDT, Dennis Tillman W7PF
<@Dennis_Tillman_W7PF> wrote:

  Hi Dave,
Stan is old. Stan has survived 2 or 3 bouts with cancer, a stroke, and
the recent loss of Pat, his spouse. So he doesn't have the energy he
used to. He does come to swapmeets where he sets up a table like he
always did. I visited him a few times last summer and fall. He is
getting frail but we went into his ham shack and puttered around for a
while looking for some things Pete Lancashire wanted.

Dennis Tillman W7PF

-----Original Message-----
From: Dave Seiter
Sent: Friday, March 29, 2019 1:33 AM

  I haven't heard about Stan in a long time; he used to post quite a
lot.  I think he had a few webcams, but they went dark long ago.
-Dave



--
Dennis Tillman W7PF
TekScopes Moderator





--
Dennis Tillman W7PF
TekScopes Moderator

Re: "Oscilloscopes: Collecting and Restoring a Classic";

Michael A. Terrell
 

There are print to order services, like http://www.lulu.com

On Thu, Mar 28, 2019 at 10:23 PM Dave Brown <davebr@...>
wrote:

Stan donated the rights to reproduce his book to the vintageTEK museum. We
sell a CD copy of it on on the museum eBay store. Stan is not reproducing
his book that we are aware of. The museum is in the process of looking into
printing more soft copies.

Dave



Re: Old Tektronix Books

Bill Fenech
 

Dan,

I purchase both online this AM through AbeBooks:

Oscilloscopes: Selecting and Restoring a Classic - $31 plus $4 shipping

Typical Oscilloscope Circuitry. Revised Edition - $19.75 including
shipping


Bill AI6JZ



Oscilloscopes: Selecting and Restoring a Classic

On Fri, Mar 29, 2019 at 1:05 PM Dennis Tillman W7PF <@Dennis_Tillman_W7PF>
wrote:

Daniel,
Good for you!

It is my impression from watching scarce items like this that there are
many companies that will advertise an item at an outrageous price even if
they don't have it. They rely on finding some other company that claims to
have it and then if you meet the price that justifies them actually hunting
down a real copy the will do that and pocket the difference.

The reality is that all there needs to be is one copy and these companies
make it appear that there may be more than one copy or even many. Daniel
discovered that in the case of Stan's book there was only one copy. Now the
price has jumped back into the stratosphere where it usually is.

I suspect there isn't more than one (or two at the most) of the Typical
Oscilloscope Circuitry books either and now that Daniel bought one of them
I think the price will skyrocket like Stan's book did.

Dennis Tillman W7PF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of
Daniel Koller via Groups.Io
Sent: Friday, March 29, 2019 9:45 AM
To: TekScopes <tekscopes@groups.io>
Subject: [TekScopes] Old Tektronix Books

Hi Folks,
The recent conversation about 500 series scopes prompted Dennis to
recommend two books,
"Oscilloscopes: Collecting and Restoring a Classic"; ISBN-13:
9780963307156; Publisher: Stanley A. Griffiths; Publication date:
01/28/1992;
"Typical Oscilloscope Circuitry", (C) 1961, 1962, Tektronix,
Inc., S. W. Millikan Way, P.O. Box 500, Beaverton, Oregon.

It occurred to me that though I have not *needed* those books to
repair my scopes in the past it sure would be nice to have a better
Idea on how the circuits work, and to be able to learn more about the
scopes in general, so I looked them up.
YESTERDAY, I was able to find a couple copies of Stan's book on
Amazon, used, for about $22. If I still have the website up at home
and it has not refreshed, I'll get a screen grab for proof, but there
were one or two copies available from at least two sources, through
Amazon. But TODAY, the least expensive copy is $94.09!! So, it
seems likely to me that this very discussion, within out closed group,
prompted someone to buy a book or two, and those actions drove up the
perceived demand on a limited resource to raise the price
significantly.
Question: Did anyone here, reading those messages yesterday go
ahead and buy Stan's book on line? What was your price and through
whom did you make the purchase? I sure HOPE that someone here bought
the book. Otherwise, I have a more nefarious theory; The bots are
actively scanning our conversations to manipulate the prices of things
on line. That is not a pleasant concept.
I found a copy through Moe's books for $28 and bought it. Let's
see how the price changes tomorrow.
As for the Tek book, "Typical Oscilloscope Circuitry", also found 3
copies in good condition for under $20 and bought one. We'll see
what happens to that as well.
I just figured I'd throw this out there as an FYI / buyer beware
sort of thing. Meanwhile, I am looking forward to some fun technical
reading!
Dan




--
Dennis Tillman W7PF
TekScopes Moderator



Re: I wonder if there is much interest in vacuum tube oscilloscopes such as the 500 series

Chuck Harris
 

Looking at the copyrights and acknowledgements, Stan vanity
pressed his book, using Tamara Wade, Specialty Binding in
Washougal, Washington. He owns the copyright for the finished
work.

If I were a betting man (I'm not), I would bet that Tamara Wade
is/was in someway connected with Tektronix's print shop.

If he still has the galleys (proofs), or can get them, he could
POD very easily.


-Chuck Harris

Shirley Dulcey KE1L wrote:

That's the beauty of print on demand. If people buy the book you make
money, though less than with a conventional print run because the cost
per copy is a bit higher. If nobody buys the book you're out next to
no cash, though you did uselessly spend time preparing your book for a
PoD release. If your primary goal is to get your book out into the
world at a reasonable price for readers, it's a good option. That's
especially true for a reissue of an older book because the time spent
writing it is already gone; you're not up against the prospect of
spending a lot of time writing something and then not getting paid for
it.

The two big players in low cost PoD publishing are Lulu.com and
Amazon's Kindle Direct Publishing. (KDP also does ebook publishing, as
you might guess from the name. Amazon's former fully owned company,
CreateSpace, was merged into KDP a couple of years ago.) Both will let
you create books with zero up-front cost, though they also offer
optional services that cost money. (A third company, iUniverse,
started that way but later pivoted into being a more traditional
vanity press, aside from doing its business online.) The zero cost
option ONLY gets you printing; you're on your own for editing,
designing a cover, preparing your book for publication, promotion, and
getting bookstores and event dealers to carry your book. You can sell
your book at their base publishing cost, in which case you make
nothing on sales, or you can set a higher price and receive a portion
of the difference between the base cost and the selling price.

One complication with reprinting old books is that the author may not
own the rights. If the book was published by a conventional publisher,
that company or its successor may own some or all of the future
publication rights. If the company is defunct it can get complicated
to untangle who actually owns the rights to the book now; they could
belong to some person or company that bought pieces of the former
publisher's intellectual property, or they may have never been bought
by anybody and be in legal limbo.

Re: Old Tektronix Books

Daniel Koller
 

Aha!  Bill, you're the culprit!   ;)
I did the same - you got there first.   The $31 "Oscilloscopes" (was $28 something when I looked) was NOT available.  GlassFrogBooks (via Abe's Books) came back and said they did not have the copy and requested $10 more to find another copy.  We will see if they can find it for $38!!   I won't go higher than that because I won't believe they can find a copy.
As for the "Typical circuits book"   There were three, one at $15, one at $17 and one at $19.   I ordered the $17 one.    I hope I get it.
Dennis, yes, what you said is right.   I've noticed that with goods sometimes - There is only one item out there, or was, as some retailer some place, but other aggregator or sale websites pretend to have is at the same price.  Sometimes it's obvious and you can tell who the original retailer is (particularly if the photos are identical).  Sometimes it's not so simple.   Such aggregator websites are infuriating because they provide no new benefit, no new information to anyone.  They are just there to scam and make money for the operator.  
Dan

On Friday, March 29, 2019, 4:55:41 PM EDT, Bill Fenech <wfenech@...> wrote:

Dan,

I purchase both online this AM through AbeBooks:

Oscilloscopes: Selecting and Restoring a Classic  -  $31 plus $4 shipping

Typical Oscilloscope Circuitry. Revised Edition  -  $19.75 including
shipping


Bill  AI6JZ

Re: Old Tektronix Books

John Williams
 

Good sleuthing. If you want a laugh take a look at the price on The Cathode Ray Tube by Peter Keller. If I hadn’t retired years ago I could sell the three books and retire in style. Apparently. Lol

Re: Old Tektronix Books

Bill Fenech
 

Slight revision to my previous email....one book is marked as received and
confirmed while the other has not confirmed yet
(though have been charged for both).

Dan - FYI I ordered both books after I saw your email this morning. :) I
was only partially up to speed on the other thread at the time.

Cheers
Bill AI6JZ

On Fri, Mar 29, 2019 at 2:16 PM Daniel Koller via Groups.Io <kaboomdk=
yahoo.com@groups.io> wrote:

Aha! Bill, you're the culprit! ;)
I did the same - you got there first. The $31 "Oscilloscopes" (was $28
something when I looked) was NOT available. GlassFrogBooks (via Abe's
Books) came back and said they did not have the copy and requested $10 more
to find another copy. We will see if they can find it for $38!! I won't
go higher than that because I won't believe they can find a copy.
As for the "Typical circuits book" There were three, one at $15, one at
$17 and one at $19. I ordered the $17 one. I hope I get it.
Dennis, yes, what you said is right. I've noticed that with goods
sometimes - There is only one item out there, or was, as some retailer some
place, but other aggregator or sale websites pretend to have is at the same
price. Sometimes it's obvious and you can tell who the original retailer
is (particularly if the photos are identical). Sometimes it's not so
simple. Such aggregator websites are infuriating because they provide no
new benefit, no new information to anyone. They are just there to scam and
make money for the operator.
Dan
On Friday, March 29, 2019, 4:55:41 PM EDT, Bill Fenech <
wfenech@...> wrote:

Dan,

I purchase both online this AM through AbeBooks:

Oscilloscopes: Selecting and Restoring a Classic - $31 plus $4 shipping

Typical Oscilloscope Circuitry. Revised Edition - $19.75 including
shipping


Bill AI6JZ






Re: Old Tektronix Books

Adrian
 

I might be a culprit too just got the only copy of “oscilloscopes” I could see on Ebay which from the photo was the same one that was listed on Amazon and a couple of other sellers google found. I already have a copy of Stan’s book

Adrian
Sent from an I-thingy

On 29 Mar 2019, at 21:21, Bill Fenech <wfenech@...> wrote:

Slight revision to my previous email....one book is marked as received and
confirmed while the other has not confirmed yet
(though have been charged for both).

Dan - FYI I ordered both books after I saw your email this morning. :) I
was only partially up to speed on the other thread at the time.

Cheers
Bill AI6JZ

On Fri, Mar 29, 2019 at 2:16 PM Daniel Koller via Groups.Io <kaboomdk=
yahoo.com@groups.io> wrote:

Aha! Bill, you're the culprit! ;)
I did the same - you got there first. The $31 "Oscilloscopes" (was $28
something when I looked) was NOT available. GlassFrogBooks (via Abe's
Books) came back and said they did not have the copy and requested $10 more
to find another copy. We will see if they can find it for $38!! I won't
go higher than that because I won't believe they can find a copy.
As for the "Typical circuits book" There were three, one at $15, one at
$17 and one at $19. I ordered the $17 one. I hope I get it.
Dennis, yes, what you said is right. I've noticed that with goods
sometimes - There is only one item out there, or was, as some retailer some
place, but other aggregator or sale websites pretend to have is at the same
price. Sometimes it's obvious and you can tell who the original retailer
is (particularly if the photos are identical). Sometimes it's not so
simple. Such aggregator websites are infuriating because they provide no
new benefit, no new information to anyone. They are just there to scam and
make money for the operator.
Dan
On Friday, March 29, 2019, 4:55:41 PM EDT, Bill Fenech <
wfenech@...> wrote:

Dan,

I purchase both online this AM through AbeBooks:

Oscilloscopes: Selecting and Restoring a Classic - $31 plus $4 shipping

Typical Oscilloscope Circuitry. Revised Edition - $19.75 including
shipping


Bill AI6JZ







Re: Old Tektronix Books

Daniel Koller
 

YESTERDAY.  PM some time.

TODAY, after a couple of us bought books, and all I did was refresh the screen:


Amazon:  liars, cheaters,... statisticians!!
  Dan
p.s.  Let's see who actually receive the books they ordered.  Three or more of us requested them.   Until one of us actually receives a book, we have to assume there are *none* out there.   Once one of two of us get books, we can then *know* there are none out there!

On Friday, March 29, 2019, 5:39:03 PM EDT, Adrian <Adrian@...> wrote:

I might be a culprit too just got the only copy of “oscilloscopes”  I could see on Ebay which from the photo was the same one that was listed on Amazon and a couple of other sellers google found. I already have a copy of Stan’s book

Adrian
Sent from an I-thingy

On 29 Mar 2019, at 21:21, Bill Fenech <wfenech@...> wrote:

Slight revision to my previous email....one book is marked as received and
confirmed while the other has not confirmed yet
(though have been charged for both).

Dan - FYI I ordered both books after I saw your email this morning.  :)  I
was only partially up to speed on the other thread at the time.

Cheers
Bill  AI6JZ

On Fri, Mar 29, 2019 at 2:16 PM Daniel Koller via Groups.Io <kaboomdk=
yahoo.com@groups.io> wrote:

Aha!  Bill, you're the culprit!  ;)
I did the same - you got there first.  The $31 "Oscilloscopes" (was $28
something when I looked) was NOT available.  GlassFrogBooks (via Abe's
Books) came back and said they did not have the copy and requested $10 more
to find another copy.  We will see if they can find it for $38!!  I won't
go higher than that because I won't believe they can find a copy.
As for the "Typical circuits book"  There were three, one at $15, one at
$17 and one at $19.  I ordered the $17 one.    I hope I get it.
Dennis, yes, what you said is right.  I've noticed that with goods
sometimes - There is only one item out there, or was, as some retailer some
place, but other aggregator or sale websites pretend to have is at the same
price.  Sometimes it's obvious and you can tell who the original retailer
is (particularly if the photos are identical).  Sometimes it's not so
simple.  Such aggregator websites are infuriating because they provide no
new benefit, no new information to anyone.  They are just there to scam and
make money for the operator.
Dan
    On Friday, March 29, 2019, 4:55:41 PM EDT, Bill Fenech <
wfenech@...> wrote:

Dan,

I purchase both online this AM through AbeBooks:

Oscilloscopes: Selecting and Restoring a Classic  -  $31 plus $4 shipping

Typical Oscilloscope Circuitry. Revised Edition  -  $19.75 including
shipping


Bill  AI6JZ







Stan Griffiths - Re: [TekScopes] I wonder if there is much interest in vacuum tube oscilloscopes such as the 500 series

toby@...
 

On 2019-03-29 4:59 PM, Chuck Harris wrote:
Looking at the copyrights and acknowledgements, Stan vanity
pressed his book,

Hate to repeat myself but I'm worried far less about the book, which is
certain to survive, in print, and somebody will soon enough digitise it;
and more about his 1000 scopes and everything else he's collected.

Somebody should probably try to find out if he has made provision for
it. Donation to TEKmuseum? Do they even have space or funds for transport?

--Toby

Re: 11801 question

Albert Otten
 

Hi Reg,

I did similar with a CSA803A. This scope has the slower Calibrator, about 120 ps rise time.
First I tested an SD-22 with the cal signal. 20 ps/div and 10 mV/div, which gives a reasonable steep mid part of the trace. About the 50% point centered at the grids center. During more than half an hour from startup I could not detect any shift in the trace.
Next I followed your splitter setup, with an SD-20 and an SD-26. In Enhanced Accuracy I set the SD-20 as delay reference and had the SD-26 delay calibrated to this. Displayed 20 ps/div and 5 mV/div. Made the mid region of the traces coincide by a small fine adjustment of Vertical Position of one of the traces. Again I saw no systematic shift of one trace w.r.t. the other. However there 2 occasions (which I noticed) where there was a short duration shift (more or less jumping) of one of the traces over 2-3 ps. That could jst as well be a shift vertically of course. I attributed this to a not firm enough cable connection somewhere since the trace returned nicely to the proper position. Not sure though.
Altogether I can't share your "pessimism" about the performance.

Albert

On Thu, Mar 28, 2019 at 12:52 AM, Reginald Beardsley wrote:


I've got the unit running with a pair of SD-22s fed by a 2 port splitter from
the calibrator into ports 5 & 7. I was finally able to figure out how to
manually adjust the skew so the two traces overlaid. The cables are about 1/2
mm different lengths

I'm seeing the displacement between the two traces vary from 0 to about 10 ps
over the course of a few minutes. Is this normal or is there a fault? I've
read the user manual once, but it's not great. Certainly no match for a 465
or 485 manual.

Does anyone know why this is happening? I've got the internal clock output
connected to an HP 8356A and I can see the period varying. I don't have the
8356A connected to a GPSDO at the moment, but it has the OXCO option and is
very stable.

Is there any reason to think that replacing the 200 MHz master oscillator with
one of Leo Bodnar's GPSDOs would eliminate the interchannel drift?

I discovered this shortly after making an offer for four SD-26 heads. My
intended use is to measure actual FPGA word skew of a DSP stream, so this
would be a serious problem.

Thanks,
Reg

Re: Tek transformer 120-0866-02

Jerry
 

I guess there isn't a PM on this board. You can send an email to clist at handler dot com. But take the 'd' out of handler. Maybe that will keep the skimmers at bay.

Jerry

Tek 11302 wanted for an HP 8568 trade

Jerry
 

I have a burning need for a Tek 11302. I have one, played around with it quite a bit but was never able to figure out what is wrong with it. The basic problem was that every time I booted it up, I had to tune the display as it was out of focus. The focus system wouldn't work enough and I had to mess with the trim pots but even then it wouldn't stick. I have the calibration software and messed around with it but you need a lot of special modules to calibrate the scope. I've been thinking lately that it probably has an NVRam or something that is bad or a battery, but it's only been about 9 months since I took a crack at it and I'm sure I looked for a battery as well as an NVRam back then. My memory just isn't there anymore. I also checked all the voltages, caps, etc, and just never got anywhere. For a while it seemed like I was making progress but it just wouldn't trace correctly (in addition to the focus). So once I got it somewhat in focus, the signal trace seemed to not overlay on subsequent traces so I had a fatter trace horizontally than expected.

Anyway, I have an 8568A that was upgraded to a B. I think they upgraded it as an option at the factory if I remember correctly. It has the 75ohm BNC connector as well as the standard 50Ohm. I had been thinking about keeping it just for the 75 ohm connector. The display is serviceable and the unit works well overall. It has all the cables and I have the interposer I think that would connect to the HP 85585A preselector. I have an 85685A preselector on my other 8568B. I believe it was stored in a closet for a very long time. I remember it being very clean inside, much more than my other 8568B and the calibration constants are better as well. I bought it about 2yrs ago as a backup to my 8568B but since I also have an 8566, I figure it would be a good trade for a working 11302 if someone has one. I want an analog scope as I think they are easier to view modulation envelopes on and I also have a good selection of modules for one already.

So, if you are in the SF Bay Area and would like to trade a working 11302 scope for a pretty decent 8568B (labeled A but it is a B) Spectrum Analyzer, please drop a note to clist at handler dot com but take the 'd' out of handler so it becomes hanler. I get so much spam as it is. I'm not interested in any other trades for the analyzer (possible 11301) as I have quite a few scopes. I somehow fell in love with the 11302 I have and just wish I was able to get it working.

Thanks,

Jerry

Re: I wonder if there is much interest in vacuum tube oscilloscopes such as the 500 series

 

At his age he isn't interested.

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of
Chuck Harris
Sent: Friday, March 29, 2019 2:00 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] I wonder if there is much interest in vacuum
tube oscilloscopes such as the 500 series

Looking at the copyrights and acknowledgements, Stan vanity pressed
his book, using Tamara Wade, Specialty Binding in Washougal,
Washington. He owns the copyright for the finished work.

If I were a betting man (I'm not), I would bet that Tamara Wade is/was
in someway connected with Tektronix's print shop.

If he still has the galleys (proofs), or can get them, he could POD
very easily.


-Chuck Harris

Shirley Dulcey KE1L wrote:
That's the beauty of print on demand. If people buy the book you
make
money, though less than with a conventional print run because the
cost
per copy is a bit higher. If nobody buys the book you're out next to
no cash, though you did uselessly spend time preparing your book for
a
PoD release. If your primary goal is to get your book out into the
world at a reasonable price for readers, it's a good option. That's
especially true for a reissue of an older book because the time
spent
writing it is already gone; you're not up against the prospect of
spending a lot of time writing something and then not getting paid
for
it.

The two big players in low cost PoD publishing are Lulu.com and
Amazon's Kindle Direct Publishing. (KDP also does ebook publishing,
as
you might guess from the name. Amazon's former fully owned company,
CreateSpace, was merged into KDP a couple of years ago.) Both will
let
you create books with zero up-front cost, though they also offer
optional services that cost money. (A third company, iUniverse,
started that way but later pivoted into being a more traditional
vanity press, aside from doing its business online.) The zero cost
option ONLY gets you printing; you're on your own for editing,
designing a cover, preparing your book for publication, promotion,
and
getting bookstores and event dealers to carry your book. You can
sell
your book at their base publishing cost, in which case you make
nothing on sales, or you can set a higher price and receive a
portion
of the difference between the base cost and the selling price.

One complication with reprinting old books is that the author may
not
own the rights. If the book was published by a conventional
publisher,
that company or its successor may own some or all of the future
publication rights. If the company is defunct it can get complicated
to untangle who actually owns the rights to the book now; they could
belong to some person or company that bought pieces of the former
publisher's intellectual property, or they may have never been
bought
by anybody and be in legal limbo.


--
Dennis Tillman W7PF
TekScopes Moderator

Re: 11801 question

Reginald Beardsley
 

Albert,

I've got the splitter setup running using two ports on a single SD-22. The delay between the traces is very stable, but relative to on screen cursors it moves around by 1-2 ps. Leo Bodnar commented he thought the low frequency shifting was due to avalanche operation in the heads.

I'm using split cursors on the first peak of the step, but I get similar results if I pick a point midway up the edge. However, I'm using the 5 ps/div range.and 100 fs cursor steps. Using a point midway on the edge seems to let me measure the delay to 200-300 fs with smoothing and 32 point averaging turned on.

This is really just gratuitous playing with a new toy that fairly well blows my mind. I bought four SD-26 heads with 2017 cal dates on eBay for $200 each. When they arrive it will get very interesting as I have an 8 port splitter.

But that requires 8 length matched cables. I'd like to get a crimper for RG402 SMA and 2.4 mm connectors but am having a hard time finding one.

The 11801 FW is incredibly buggy, but when it's working properly it's an awesome instrument. Now I just need an SD-24 and an SD-32 at sensible prices.

Once I figure out how to get machine readable data off this beast I'll be able to do some really cool stuff. At least after a week or two of math and physics ;-)

Reg

Re: 11801 question

Jim Ford
 

Hi, Reg.I think you want 2.92 mm connectors.  2.4 mm connectors will not mate with SMAs.  SMA, 3.5 mm, and 2.92 mm are all mechanically compatible. I understand that 2.4 mm and 1.85 mm connectors will intermate but not with SMA and the like. Jim Ford Sent from my Verizon, Samsung Galaxy smartphone

-------- Original message --------From: "Reginald Beardsley via Groups.Io" <pulaskite=yahoo.com@groups.io> Date: 3/29/19 4:51 PM (GMT-08:00) To: TekScopes@groups.io Subject: Re: [TekScopes] 11801 question Albert,I've got the splitter setup running using two ports on a single SD-22.  The delay between the traces is very stable, but relative to on screen cursors it moves around by 1-2 ps.  Leo Bodnar commented he thought the low frequency shifting was due to avalanche operation in the heads.I'm using split cursors on the first peak of the step, but I get similar results if I pick a point midway up the edge.  However, I'm using the 5 ps/div range.and 100 fs cursor steps.  Using a point midway on the edge seems to let me measure the delay to 200-300 fs with smoothing and 32 point averaging turned on.This is really just gratuitous playing with a new toy that fairly well blows my mind.  I bought four SD-26 heads with 2017 cal dates on eBay for $200 each.  When they arrive it will get very interesting as I have an 8 port splitter.  But that requires  8 length matched cables.  I'd like to get a crimper for RG402 SMA and 2.4 mm connectors but am having a hard time finding one.The 11801 FW is incredibly buggy, but when it's working properly it's an awesome instrument.  Now I just need an SD-24 and an SD-32 at sensible prices.Once I figure out how to get machine readable data off this beast I'll be able to do some really cool stuff.  At least after a week or two of math and physics ;-)Reg

Re: 11801 question (+GPSDO vs OXCO)

Reginald Beardsley
 

Jim,

The SD-22, 24 & 26 use 3.5 mm connectors. The SD-30 & 32 use 2.4 mm connectors. Having been infected with a severe case of "Test Equipment Acquisition" syndrome, I'm trying to cope as best I can. I'm also trying to avoid doing something stupid. I'm playing with things I never even dreamed I could have. And measuring the air gap in an SMA to 3.5 mm connection completely blows my mind!

I'm seeing a slow, persistent 5 ps variation in trace timing even after running for hours. The 11801 uses a 200 MHz OCXO. Even if it is good to 1e-8, 5 ps is 2e-11. But the scanty service data make it hard to know how the horizontal sweep clock is being generated.

Has anyone replaced the OCXO with a GPDSO. Leo Bodnar is of the opinion that the periodic drift is the sampling head.

I plan to test that tomorrow by locking my LeCroy DDA-125 to a 10 MHz reference and then comparing the OCXO output to a 200 MHz signal from the other port on Leo's GPSDO. At least if I can figure out the correct settings for Leo's dual GPSDO for 200 MHz output.

Have Fun!
Reg

Re: 11801 question (+GPSDO vs OXCO)

 

Hi Reginald,

There are sophisticated ways to increase the time resolution of timebases which I first discovered while reading the Tek DC5010 service manual. It was many years ago so I no longer remember the details, but what I do remember is thinking at the time that it was an electronic equivalent to how a Vernier Caliper works to get an additional digit of resolution out of a measurement scale.

It is unfortunate that Tek no longer provides technical details and a detailed Theory of Operation the way they once did. I always wonder if this was done in a vain attempt to turn a profit for the support their manuals used to provide because they were losing money, or if this was a decision that backfired on them and caused them to lose even more money that they might have otherwise.

Either way it was coincident with Tek beginning a deep slide they never recovered from.

Dennis Tillman W7PF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of
Reginald Beardsley via Groups.Io
Sent: Friday, March 29, 2019 6:13 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] 11801 question (+GPSDO vs OXCO)

Jim,

The SD-22, 24 & 26 use 3.5 mm connectors. The SD-30 & 32 use 2.4 mm
connectors. Having been infected with a severe case of "Test
Equipment Acquisition" syndrome, I'm trying to cope as best I can.
I'm also trying to avoid doing something stupid. I'm playing with
things I never even dreamed I could have. And measuring the air gap
in an SMA to 3.5 mm connection completely blows my mind!

I'm seeing a slow, persistent 5 ps variation in trace timing even
after running for hours. The 11801 uses a 200 MHz OCXO. Even if it
is good to 1e-8, 5 ps is 2e-11. But the scanty service data make it
hard to know how the horizontal sweep clock is being generated.

Has anyone replaced the OCXO with a GPDSO. Leo Bodnar is of the
opinion that the periodic drift is the sampling head.

I plan to test that tomorrow by locking my LeCroy DDA-125 to a 10 MHz
reference and then comparing the OCXO output to a 200 MHz signal from
the other port on Leo's GPSDO. At least if I can figure out the
correct settings for Leo's dual GPSDO for 200 MHz output.

Have Fun!
Reg



--
Dennis Tillman W7PF
TekScopes Moderator