Date   

Re: Tektronix 453 Orginial Instruction Manual (How useful is it?)

ROLYNN PRECHTL K7DFW
 

Bill, in general a Tek instruction or operator's manual consists of the
description, specifications, and operation instructions, plus options and
accessories information. Some are in a small format for storage in a top
pouch or drawer. The service manuals generally include all of the above
information, plus of course service info.
============================

This may confuse the poor guy, especially with instruments of that era.

There was a period during which all manuals were marked "Instruction".

These manuals had "Instruction" printed in silver on the blue front cover
and could be either an "Operators" or "Service" manual depending on what was
spelled out in the cutout window of the front cover where the instrument
nomenclature was printed. For example it would show "475 Service" or "475
Operators" through the front cover cutout. The "Operators" was a thinner
manual than the "Service" and was easy to spot because it didn't have tabs
for the schematic pages because there were none.

After this period there was no "Instruction" marked on the front cover. It's
during this period where the buyer may have to ask which manual someone is
selling i.e. does it have schematics (Service)?


K7DFW Tek Bvtn & Sunset '66-'71


6DJ8/6922

oldtek2003
 

Very interesting technical treatise on the 6DJ8/6922, written from
the audiophiles' perspective, but interesting references to
Tektronix...

http://store.electron-valve.com/suof6dforau.html


Cheers,
Tony


Tektronix 453 Orginial Instruction Manual (How useful is it?)

Bill Smith <ko4nrbs@...>
 

Just how much information is in the "Instruction
Manual". Is it a must have or is the service manual
the one you really need?
Thanks,
Bill

=====
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2710 analyzer, any list ?

Patrick Egloff <eplist@...>
 

Hi All,

It seems that i will not find a help on this list. :- ((

Is there any other list for Tektronix equipments, specialy spectrum analyzers ?

Patrick


Re: How to ruin a 535...

Dave Wise
 

6DJ8s were allowed (nay, preferred) as a substitute
for the 6BQ7A in the 53x/54x. The reason given in
the Mod Summary: Reliability.

'nuff said.

Dave Wise

-----Original Message-----
From: Tony Denning [mailto:tdenning@sympatico.ca]
Sent: Thursday, January 22, 2004 9:37 AM
To: TekScopes@yahoogroups.com
Subject: [TekScopes] Re: How to ruin a 535...


---
Interesting. I wasn't aware of this with 6BQ7A's From the manuals &
schematics I've seen, it looks like Tektronix did away with 6BQ7A's
around 1958-59, replacing them with 6DJ8s, which from my recollection
have a higher Gm. The 6BQ7A's I have are military surplus, made by
GE in the early 60's. I haven't had any problem with them as of yet.
Perhaps the older 6BQ7 had the problem.

Tony


In TekScopes@yahoogroups.com, "Robert Morein" <morepub@c...> wrote:
If you do that, you should know that the 6BQ7A may have been an
older tube that had a mechanically fragile structure. Simply moving
the scope around could cause tube failure. The later "frame grid"
tubes were an advance in shock resistance.

I can't remember for sure whether the 6BQ7A is the problem tube,
but I encountered this with a 545.

I bought a scope on eBay which had all the 6BQ7A's replaced with
6DJ8 - the Amperex "Orange Globe" variety - which from my cursory
research, seem to be fetching a premium on eBay. Can't
understand
it myself... but anyway, it looks like there's some money to be
made
here. I'll pull all the 6DJ8s and replace them with some JAN
6BQ7A's that I bought for next to nothing, and sell the 6DJ8's to
some audiophile nutter... that should cover my original
investment
in the scope and repair parts (and repair parts for the next 40
years).




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Re: eBay phishing

Dennis Tillman <Dennis@...>
 

There is not just one 'author' of this scam. There are quite a few. As eBay
shuts one down another one pops up somewhere else. I am, unfortunately, on
numerous spam lists and as a result I get 150+ emails a day. Two or three
times a week I get one of these eBay spoofs. eBay takes them seriously and
usually shuts them down within 24 hours.

Whenever you receive one of these spoofs FORWARD it (using your FORWARD
button in your eMail program) to spoof@ebay.com. They will track down
the offending site. If you go back to it a day later you will see it
is no longer available.

-----Original Message-----
From: Miroslav Pokorni [mailto:mpokorni2000@yahoo.com]
Sent: Thursday, January 22, 2004 10:20 AM
To: tekscopes@yahoogroups.com
Subject: Re: [TekScopes] eBay phishing


The authors of this action have been already found and I suppose eBay
has informed its legal-office for starting the consequent procedure.
I wonder about e-bay's actions. From my experience, e-bay is taking only
passive measures, i.e. few soothing words to customer and instructions on
how to recognize spoofing and what e-bay will not ask from us, all
boilerplate stuff.

It is quite easy to spot that credit card information request is fraud,
because buyers, at least, do not have that on file with e-bay. Things get
somewhat more involved when spoofers pose as PayPal, but again those seem to
be quite clumsy attempts. I would not know how many victims PayPal spoofers
net, but I doubt that many people fall for it. However, I am not saying that
any of those risks should be discounted.

It seems that "about.com" is involved too with this affaire, because
they accepted to register an evidently illicit subdomain containing the
leftmost characters of a string eBay already uses in its existing URLs.
Andreas, I do not want to imply that your views about internet community
attempts to fight fraud are naove, but those people are of the same kind as
ones who were in dot-coms. They will tell you, with fervor, how dedicated to
customer satisfaction and safety of our privacy they are and round file
reports on attempted fraud or technical problems in the next breath. Shell I
remind you about those solicitous 'error reports' that our PC monitors
(Windows of newer kind) file with Microsoft, whenever something on PC
crashes and, believe me, all those reports end up in a bit bucket.

Regards

Miroslav Pokorni


Re: eBay phishing

Miroslav Pokorni
 

The authors of this action have been already found and I suppose eBay
has informed its legal-office for starting the consequent procedure.
I wonder about e-bay's actions. From my experience, e-bay is taking only
passive measures, i.e. few soothing words to customer and instructions on
how to recognize spoofing and what e-bay will not ask from us, all
boilerplate stuff.

It is quite easy to spot that credit card information request is fraud,
because buyers, at least, do not have that on file with e-bay. Things get
somewhat more involved when spoofers pose as PayPal, but again those seem to
be quite clumsy attempts. I would not know how many victims PayPal spoofers
net, but I doubt that many people fall for it. However, I am not saying that
any of those risks should be discounted.

It seems that "about.com" is involved too with this affaire, because
they accepted to register an evidently illicit subdomain containing the
leftmost characters of a string eBay already uses in its existing URLs.
Andreas, I do not want to imply that your views about internet community
attempts to fight fraud are na�ve, but those people are of the same kind as
ones who were in dot-coms. They will tell you, with fervor, how dedicated to
customer satisfaction and safety of our privacy they are and round file
reports on attempted fraud or technical problems in the next breath. Shell I
remind you about those solicitous 'error reports' that our PC monitors
(Windows of newer kind) file with Microsoft, whenever something on PC
crashes and, believe me, all those reports end up in a bit bucket.

Regards

Miroslav Pokorni


Re: Goverment Auction in Norfolk, Va.(Lot's of Tektronix Scopes)

regman10
 

I have actually bought a fair amount of gear from gov. liquidators. Most
people (like myself) wait until the last minute to bid (so the $35.00
minimum bid price will change -sometimes dramatically). Don't forget the
hidden costs such as local sales tax and the 10% "buyers premium".

The photos don't tell the whole story - oftentimes the equipment is
positioned not to show damaged controls, etc. Examine the photos VERY
CAREFULLY. The condition codes are often inaccurate. I bought one unit,
condition A4, and someone had removed ALL of the IC's inside (But then I
bought a 7603 w/plugins for $35.00, that was an H7, that was repaired with a
junkbox transistor).

The shipping charges will make you faint - I have paid over $100.00 for
shipping (a scope) - as high as $150.00. The packers vary all over the
place - I had one shipment where they threw all 3 scopes in a double wall
box (453, 453A and a 465M) All three were destroyed in shipping. I have yet
to be reimbursed for anything yet my shipping instructions were to pack each
item separately and I was billed for that. The insurance only covers 10
cents to the pound and IT GOES TO THE SHIPPER! Some sites have notoriously
bad packers. Other sites do foam-in-place tri-wall box. If you can pick
the stuff up yourself you'll be way ahead. I am willing to pay a premium
price to pick up stuff locally whenever possible because of the high
shipping costs (not to mention the likelyhood of damage). And by the way,
Norfolk VA was where I had my worst experience. Pay the premium for the
best packing job. I have also had things omitted from the shipment that was
in the photos like covers, etc. I have had entire portions of the order
"lost" and not shipped. Buyer beware.

By the time I have made repairs, located suitable probes, manuals, etc. I
have lost money on every scope I have purchased. Paying the full price on a
eBay scope that is warranted is not that bad of a deal. It's really more of
a hobby because I enjoy repairing stuff. There is a reeason why the govt.
is dumping this stuff. You may luck out and find that one unit that was
truly underutilized and truly surplus then again you may be getting a beater
that's not economically repairable.

This is not to say you can't get a good deal from them occasionally, but
you'll be much happier with lowered expectations.

The old saying - if it seems like too good of a deal - it probably isn't-
rings true here.

-----Original Message-----
From: Bill Smith [mailto:ko4nrbs@yahoo.com]
Sent: Thursday, January 22, 2004 7:16 AM
To: TekScopes@yahoogroups.com
Subject: [TekScopes] Goverment Auction in Norfolk, Va.(Lot's of
Tektronix Scopes)


Here is five 453 scopes as a lot with the bid now at
$35.00.
http://web.govliquidation.com/auction/view?id=312815

Lot's of 465 and 475 scopes there as well.
http://origin.govliquidation.com/list/c7234/lna/3.html

Auction is over in 6 hours!!
Bill


=====
Bill Smith KO4NR

__________________________________
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Yahoo! SiteBuilder - Free web site building tool. Try it!
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Re: How to ruin a 535...

oldtek2003
 

---
Interesting. I wasn't aware of this with 6BQ7A's From the manuals &
schematics I've seen, it looks like Tektronix did away with 6BQ7A's
around 1958-59, replacing them with 6DJ8s, which from my recollection
have a higher Gm. The 6BQ7A's I have are military surplus, made by
GE in the early 60's. I haven't had any problem with them as of yet.
Perhaps the older 6BQ7 had the problem.

Tony


In TekScopes@yahoogroups.com, "Robert Morein" <morepub@c...> wrote:
If you do that, you should know that the 6BQ7A may have been an
older tube that had a mechanically fragile structure. Simply moving
the scope around could cause tube failure. The later "frame grid"
tubes were an advance in shock resistance.

I can't remember for sure whether the 6BQ7A is the problem tube,
but I encountered this with a 545.

I bought a scope on eBay which had all the 6BQ7A's replaced with
6DJ8 - the Amperex "Orange Globe" variety - which from my cursory
research, seem to be fetching a premium on eBay. Can't
understand
it myself... but anyway, it looks like there's some money to be
made
here. I'll pull all the 6DJ8s and replace them with some JAN
6BQ7A's that I bought for next to nothing, and sell the 6DJ8's to
some audiophile nutter... that should cover my original
investment
in the scope and repair parts (and repair parts for the next 40
years).


fair price for 475 tripler

nn0c <nn0c@...>
 

I have a dismembered 475 that another ham is interested in.
Particularly the 'tripler'. Could someone please clue me in on a
fair price for a working 'tripler'?

Thanks

Paul NN0C


Re: eBay phishing

Andreas <signupbox@...>
 

The phishing pages can be easily recognized because:

1. eBay will never ask you for personal data as password, Credit Card number or s.o.
2. they aren't secured pages (no HTTPS protocol!)
3. the rerouted data belongs to the domain "k3.com" (no doubt this is not under eBay's domain) masked into a long and weird URL

More danger comes with the fact that the incriminated pages requests your Credit Card info.

This attempt has been really easy to counter fight.
The authors of this action have been already found and I suppose eBay has informed its legal-office for starting the consequent procedure.

It seems that "about.com" is involved too with this affaire, because they accepted to register an evidently illicit subdomain containing the leftmost characters of a string eBay already uses in its existing URLs.

No further comment.

Andreas.



Ben Clarke wrote:

At 00:25 22/01/04, Craig Sawyers wrote:

If you DO make the mistake of filling in the spoof form, you will have given
your log-on details (name and password) so some shady third party, who can
then get access to all your eBay account information.
Though you may not want your account details to be accessible to someone else the real danger here is of 'Identity Theft'.
The spoofers are looking for an account with a nice high number of solid positive feedback reports, ie a trustworthy eBay seller.
Once they get the password they change the email address to their own Hotmail one, then put a brand new, top of the range, Apple laptop, or similar high value item up for sale with a Buy It Now at less than half it's value. To all intents and purposes it looks like a very good, safe, deal so within a couple of hours they will get some poor punter hooked. He sends his money but never sees the laptop of course, eventually he complains to eBay who point the finger at you.
Beware,
Ben
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Re: How to ruin a 535...

Robert Morein <morepub@...>
 

If you do that, you should know that the 6BQ7A may have been an older tube that had a mechanically fragile structure. Simply moving the scope around could cause tube failure. The later "frame grid" tubes were an advance in shock resistance.

I can't remember for sure whether the 6BQ7A is the problem tube, but I encountered this with a 545.

----- Original Message -----
From: Tony Denning
To: TekScopes@yahoogroups.com
Sent: Wednesday, January 21, 2004 8:16 PM
Subject: [TekScopes] Re: How to ruin a 535...


--- In TekScopes@yahoogroups.com, "Craig Sawyers" <c.sawyers@t...>
wrote:

I bought a scope on eBay which had all the 6BQ7A's replaced with
6DJ8 - the Amperex "Orange Globe" variety - which from my cursory
research, seem to be fetching a premium on eBay. Can't understand
it myself... but anyway, it looks like there's some money to be made
here. I'll pull all the 6DJ8s and replace them with some JAN
6BQ7A's that I bought for next to nothing, and sell the 6DJ8's to
some audiophile nutter... that should cover my original investment
in the scope and repair parts (and repair parts for the next 40
years).

Cheers,
Tony


>> Yup. I've seen a few on eBay sans tubes over the last year.
Suppose the
> equation is that the 18 or more 6DJ8's are worth a mint to the
audio folks
> (perhaps $20 each), whereas a fully working 5xx series scope will
only get
> $50 maximum.
>
> Very glad that my 545A has the full complement of firebottles!
>
> Craig



------------------------------------------------------------------------------
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Goverment Auction in Norfolk, Va.(Lot's of Tektronix Scopes)

Bill Smith <ko4nrbs@...>
 

Here is five 453 scopes as a lot with the bid now at
$35.00.
http://web.govliquidation.com/auction/view?id=312815

Lot's of 465 and 475 scopes there as well.
http://origin.govliquidation.com/list/c7234/lna/3.html

Auction is over in 6 hours!!
Bill


=====
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__________________________________
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Re: BAMA

jeans <jeans@...>
 

Hi michael, BAMA is working fine here (Australia) <http://bama.sbc.edu/>.
Don Black.

Michael Dunn wrote:

I haven't been able to get into BAMA for days! Anyone NOT having probs?




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Re: eBay phishing

benclarke_uk
 

At 00:25 22/01/04, Craig Sawyers wrote:
If you DO make the mistake of filling in the spoof form, you will have given
your log-on details (name and password) so some shady third party, who can
then get access to all your eBay account information.

Though you may not want your account details to be accessible to someone
else the real danger here is of 'Identity Theft'.

The spoofers are looking for an account with a nice high number of solid
positive feedback reports, ie a trustworthy eBay seller.

Once they get the password they change the email address to their own
Hotmail one, then put a brand new, top of the range, Apple laptop, or
similar high value item up for sale with a Buy It Now at less than half
it's value. To all intents and purposes it looks like a very good, safe,
deal so within a couple of hours they will get some poor punter hooked. He
sends his money but never sees the laptop of course, eventually he
complains to eBay who point the finger at you.

Beware,

Ben


Re: Tek Circuitry Book (1962)

robin.birch@...
 

But they won't ship outside of us or ca - sob :-). ANy one got one that
they'll sell to the uk?

Cheers

Robin



"Tony Denning"
<tdenning@sympat To: TekScopes@yahoogroups.com
ico.ca> cc:
Subject: [TekScopes] Tek Circuitry Book (1962)
22/01/2004 02:41






Good book for sale on eBay for those interested in the older
tube/valve Tek scopes...

http://cgi.ebay.ca/ws/eBayISAPI.dll?
ViewItem&item=3072593242&category=15050

Cheers,
Tony




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Re: Tek Circuitry Book (1962)

Craig Sawyers <c.sawyers@...>
 

Good book for sale on eBay for those interested in the older
tube/valve Tek scopes...
That's a good book. If you have a 535, 545 or 555 you'll find that the book
deals with the design principle behind every circuit in it. Written at a
time when Tek was seriously proud of what it did, and not paranoid about
plagiarism of its schematics and know-how. Can you image them now
publishing a detailed technical treatise about their DPO's?

Craig


Tek Circuitry Book (1962)

oldtek2003
 

Good book for sale on eBay for those interested in the older
tube/valve Tek scopes...

http://cgi.ebay.ca/ws/eBayISAPI.dll?
ViewItem&item=3072593242&category=15050

Cheers,
Tony


Tek T912 Intensity?

manfromtrane <ccramb@...>
 

Dear Group,
I am needing some advise on a T912 scope. I got it from an auction on
Ebay. It appears to be brand new. It had the usual problem of the
capacitor 478 shorted which drops the +120. After correcting that I
was able to get a display. The next item is that the traces are a
little wider than needed and the background of the screen has green
glow. Not as bright as when you turn on the storage but the same
contrast behind traces. I have checked all the power supplies, Astig
is funtioning, Focus is functioning and down the circuit from the
intensity and Z axis appear to be giving the right voltage and wave
forms. The high voltage supply or the CRT is making a high pitch
sound when I turn the intensity up. It quiets down when I turn it
down. If I turn the intensity clear down I should not have any trace
display but that is not the case. It dims but is still very visible.
I am thinking that High voltage must be in a runaway and is too high
and isn't being reduced enough to back off the display. I don't have
access to HV probe so that is a problem I know. Could this be a CRT
problem or something outside of it? Any help would be greatly
appreciated.


Re: How to ruin a 535...

Bill Lewis <wrljet@...>
 

I got my 180A like that. Only had to dig up the 52 tubes to put it back on the air.

Had a few others like that as well.

Bill

From: "Albert LaFrance" <lafrance@att.net>

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2590535177

Albert

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