Date   
Re: How to Use this Forum ..... ????

David DiGiacomo
 

On Sun, Mar 4, 2018 at 7:04 PM, tinkera123 <@tinkera123> wrote:
I cannot find anywhere, including in "Help", as to how to do the following. Can some either explain how it works .... or point to somewhere I can read it myself ....?????
1. How do I Private Message another Member of this Group ??
2. How do I 'archive' Topics that I feel I will need to refer to in the future ?? I am aware of the "Search" function.
Both of these are extremely easy on groups.io:

1. Starting from the message page or topic page, click on Reply, then Private.

2. Go to the topic page, then save the URL (or just print the page to
PDF from your browser).

Re: Right / Best way to rename a topic

Fabio Trevisan
 

Thanks Chuck and David (Partridge),

You both share the same opinion (That I better not change the subject of an
existing thread) so I`ll follow.

Rgrds,

Fabio

2018-03-05 12:06 GMT-03:00 Chuck Harris <cfharris@...>:

There really is only one way to rename a topic, and that
is to change what is in the Subject box.

The problem with renaming a topic, is that all previous
posts, and all replies to previous posts, keep the same
topic. The only posts that change are yours, and anyone
that replies to you. Further, the renamed topic retains
its position in the threading of the original topic.

Changing the topic as a means of starting a new topic is
strictly frowned upon. Doing so keeps the "new" topic in
the threading of the old topic, and seriously confuses
the readers.

I would venture that the best thing to do, is to compose
a new thread with a new topic, and be happy.

-Chuck Harris



Fabio Trevisan wrote:
Hello Folks,
My last topic was about the Tek 7623A I was prospecting to purchase.
Well, it's purchased already and I even started discussing its problems
and getting replies...
So I would like to rename the topic, so the subject reflect the ongoing
discussion...
Is there a right way to give the topic a new name, like I see sometimes
on the list... e.g.: New Subject... (was old subject)?
I`m taking the opportunity to improve my usage of the group, in order to
maintain the topic integrity and assure search-ability, etc...
Rgrds,
Fabio


Re: Can I install a 2465B motherboard in a 2445B chassis? What will I get?

Sergey Kubushyn
 

On Mon, 5 Mar 2018, David Thomas wrote:

No upside/downside -- as somebody already mentioned firmware is the same
between 2445B and 2465B and it learns what it is running on by checking
jumpers/straps on the A1 board. Just get the latest version available and
you are good to go.

I have one 2445B gathering dust on a shelf myself and couple of 2456B A1
boards so I'll convert it to 2465B when time permit. I do even have a 2465B
label :)

Not going to sell it; it is a spare and current prices make it not worth
bothering with selling. My primary analog scope is 2467B and I also have a
spare one but 2465B has bigger screen...

...so what would be the downside to installing a 2465 A5 ROM in a 2445?  Do you think it might be capable of those extended sweep rates? Any other pro's \ cons?
I have a 2445 which might thank me for a little upgrade, if its possible... :-)
--
Best Regards

David Thomas
---
******************************************************************
* KSI@home KOI8 Net < > The impossible we do immediately. *
* Las Vegas NV, USA < > Miracles require 24-hour notice. *
******************************************************************

Re: Can I install a 2465B motherboard in a 2445B chassis? What will I get?

David Thomas
 

...so what would be the downside to installing a 2465 A5 ROM in a 2445?  Do you think it might be capable of those extended sweep rates? Any other pro's \ cons?
I have a 2445 which might thank me for a little upgrade, if its possible... :-)
--
Best Regards

David Thomas

Re: Tek 547 A Sweep display during retrace

Dave Wise
 

Thank you, Chris, for your kind gift of a Siemens AF118 transistor for testing.

At least in the Q373 position*, your sample AF118 performed like a 2N2207.  I saw 60ns delay and 25ns rise vs 50ns/35ns for 2N2207, giving the same turn-on time.

That said, my recommendation stands: BC556 or KSA992, with 220pF added to the speedup cap.  That's cheap and abundant and anyone can do it, not just the oddball with a box of AF118's.  :)

Thanks,
David

* Should be the same in the Q173 position but I didn't test it.
________________________________________
From: TekScopes@... on behalf of Christopher Hilton-Johnson chj@... [TekScopes] <TekScopes@...>
Sent: Saturday, November 25, 2017 2:15 AM
To: TekScopes@...
Subject: Re: [TekScopes] Re: Tek 547 A Sweep display during retrace

Have you looked at the AF118 as a replacement for the 2N2207?

I ask, because most of my pulls were AFs pretending to be 2Ns

Chris HJ​

Heathkit EU-81A

Leon Robinson
 

I picked up a Heathkit EU-81A Function Generator at the Russelville, AR
Hamfest Saturday, it works OK but only has a "partial" manual without any
schematic.
The only manual I can find on the Internet is the same one I got with it.
It looks a lot like a Khron-Hite but different.

Does anyone have a copy or know where there is one.

Thanks
Leon Robinson    K5JLR

Political Correctness is a Political Disease.

| | Virus-free. www.avg.com |

Re: TekScope PDFs

bobh@joba.com
 

Just to tag on to Fabio's recommendations I'll add that if you can't find what you want there are several people who sell manuals on ebay.  And, Dave at Artek http://artekmanuals.com/manuals/tektronix-manuals/ is the best for getting an excellent copy either on disk or by ftp download.

There is also the internet archive https://archive.org/details/manuals_tektronix

Occasionally I use the Wayback machine to got back in time and find a text file or maybe a pdf that was available but seemed to disappear from the net.

Ok, there is also http://www.ko4bb.com/getsimple/index.php?id=manuals&dir=Tektronix

The VintageTek museum sells original hardcopy Tek manuals and other items on ebay and also thru their website https://vintagetek.org/

Bob.

On 3/5/2018 8:54 AM, Fabio Trevisan wrote:
Hello Gary,
Desirable as it is, I don't think there's such one place...
Assuming that you're not familiar with...
There's the "TekWiki" website, kindly run and maintained by one of the
members - Kurt - and it's a good place to start (
http://w140.com/tekwiki/wiki/Main_Page).
As complete as it is, it's an autonomous effort and hosts a bunch of
information, not only product manuals, but other Tektronix publications,
but for a few models there's no manual available.
There's also the "Boat Anchor Manual Archive" another individual
innitiative: http://bama.edebris.com/manuals/
Some of the manuals are available at the internet archive:
http://bama.edebris.com/manuals/
And there's the Tektronix website... They still have some stuff, and not
only of the new things... e.g. I found the manual for the Tektronix 468
there (which is more than 30 yo).

Those are the ones I know that have scanned PDF manuals that have manuals
or other publications that are allowed to be freely distributed (e.g. clear
of copyrights issues)... And the quality of the scans are assorted. You
will find some very good scans, as well as scans with missing pages...
Split-apart schematics and drawing pages (large pages that were scanned in
2 pieces, instead of one single big scan).

There are many other sites on the web (I won't mention names, just Google
for them), that hosts manuals that are not cleared of copyrights... but
it's a scattered resource at best.

What you wish, would probably need to be an initiative by Tektronix
themselves... but Tek under Danaher seems not to be so fond of their own
history and legacy as one (or as us, Tek enthusiasts) would wish.

Rgrds,

Fabio

2018-03-05 1:58 GMT-03:00 Gary Robert Bosworth <@grbosworth>:

Does anyone know a website where I can download ALL of the TekScope
publications in PDF format?
Gary



Re: TekScope PDFs

Fabio Trevisan
 

Hello Gary,
Desirable as it is, I don't think there's such one place...
Assuming that you're not familiar with...
There's the "TekWiki" website, kindly run and maintained by one of the
members - Kurt - and it's a good place to start (
http://w140.com/tekwiki/wiki/Main_Page).
As complete as it is, it's an autonomous effort and hosts a bunch of
information, not only product manuals, but other Tektronix publications,
but for a few models there's no manual available.
There's also the "Boat Anchor Manual Archive" another individual
innitiative: http://bama.edebris.com/manuals/
Some of the manuals are available at the internet archive:
http://bama.edebris.com/manuals/
And there's the Tektronix website... They still have some stuff, and not
only of the new things... e.g. I found the manual for the Tektronix 468
there (which is more than 30 yo).

Those are the ones I know that have scanned PDF manuals that have manuals
or other publications that are allowed to be freely distributed (e.g. clear
of copyrights issues)... And the quality of the scans are assorted. You
will find some very good scans, as well as scans with missing pages...
Split-apart schematics and drawing pages (large pages that were scanned in
2 pieces, instead of one single big scan).

There are many other sites on the web (I won't mention names, just Google
for them), that hosts manuals that are not cleared of copyrights... but
it's a scattered resource at best.

What you wish, would probably need to be an initiative by Tektronix
themselves... but Tek under Danaher seems not to be so fond of their own
history and legacy as one (or as us, Tek enthusiasts) would wish.

Rgrds,

Fabio

2018-03-05 1:58 GMT-03:00 Gary Robert Bosworth <@grbosworth>:

Does anyone know a website where I can download ALL of the TekScope
publications in PDF format?
Gary



Re: Right / Best way to rename a topic

Chuck Harris
 

There really is only one way to rename a topic, and that
is to change what is in the Subject box.

The problem with renaming a topic, is that all previous
posts, and all replies to previous posts, keep the same
topic. The only posts that change are yours, and anyone
that replies to you. Further, the renamed topic retains
its position in the threading of the original topic.

Changing the topic as a means of starting a new topic is
strictly frowned upon. Doing so keeps the "new" topic in
the threading of the old topic, and seriously confuses
the readers.

I would venture that the best thing to do, is to compose
a new thread with a new topic, and be happy.

-Chuck Harris



Fabio Trevisan wrote:

Hello Folks,
My last topic was about the Tek 7623A I was prospecting to purchase.
Well, it's purchased already and I even started discussing its problems and getting replies...
So I would like to rename the topic, so the subject reflect the ongoing discussion...
Is there a right way to give the topic a new name, like I see sometimes on the list... e.g.: New Subject... (was old subject)?
I`m taking the opportunity to improve my usage of the group, in order to maintain the topic integrity and assure search-ability, etc...
Rgrds,
Fabio

Re: Right / Best way to rename a topic

 

Please don't EVER do that, it messes up thread based readers!

Please start a completely new topic (i.e. don't reply to an existing topic and change the subject in your mail client).

David

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Fabio Trevisan
Sent: 05 March 2018 13:50
To: TekScopes@groups.io
Subject: [TekScopes] Right / Best way to rename a topic

Hello Folks,
My last topic was about the Tek 7623A I was prospecting to purchase.
Well, it's purchased already and I even started discussing its problems and getting replies...
So I would like to rename the topic, so the subject reflect the ongoing discussion...
Is there a right way to give the topic a new name, like I see sometimes on the list... e.g.: New Subject... (was old subject)?
I`m taking the opportunity to improve my usage of the group, in order to maintain the topic integrity and assure search-ability, etc...
Rgrds,
Fabio

Re: Tekmate floppy setup problem.

Szabolcs Szigeti
 

Hi,

Thanks, but I doubt it. I have tried a number of disks, even one from an
original packaging. I'm able to use them in a notebook. The imteresting
thing is that if I try to format them in in the Tekmate, then format stops
with unusable track 0, but it formats that track. or at least does
something with that, because then I have to reformat the disk to use it
again. This is why i suspect that there is some discrepancy in what
bios/dos thinks about the drives and what they are really. But, I do not
see anything else other than the bios setup to change the floppy type.
I can still not beleive that I have 3 equally faulty floppy drives, but
I'll try and get hol of a fourth one or try them in a PC. I'll also try
cleaning them, to make sure that that is not the problem.

Szabolcs

2018-03-05 4:04 GMT+01:00 battyhugh <@Hugh>:

It might surprise you, but your floppys are corrupt. I would suggest
getting a tube of disk cleaner (10%alcohol and a drop of detergent) - and
using a nice clean tissue - I recommend toilet paper - open the shutter and
clean the disk carefully on both sides. I have to do this to recover old
disks with files.

Good luck

Hugh @Hugh



Right / Best way to rename a topic

Fabio Trevisan
 

Hello Folks,
My last topic was about the Tek 7623A I was prospecting to purchase.
Well, it's purchased already and I even started discussing its problems and getting replies...
So I would like to rename the topic, so the subject reflect the ongoing discussion...
Is there a right way to give the topic a new name, like I see sometimes on the list... e.g.: New Subject... (was old subject)?
I`m taking the opportunity to improve my usage of the group, in order to maintain the topic integrity and assure search-ability, etc...
Rgrds,
Fabio

Re: [Resolved] 5L4N Spectrum not Analyzing

magnustoelle
 

I admire your persistence, Rick.

Cheers,

Magnus

Re: Diode 5082-2068 Substitute or Source

brasscat
 

I've got a few Philips BAT85 schottky diodes 30V 200mA on the way,
going to try one of those. Could get one from that ohio class sub, but
it was taking up too much room and the neighbors were beginning to
talk, so it had to go. But, I could get one from a junker FG502 if I had
one.

[Resolved] 5L4N Spectrum not Analyzing

Rick
 

Fixed per the last thread

Re: 5L4N Spectrum not Analyzing

Rick
 

Turns out I had a decade counter on hand that met most of the specs. That did the trick and the unit is now working. The LO signal makes it to the mixer and the analyzer displays the spectrum. The remaining problem is that the -20dB gain setting is very low or not passing the signal at all. This is an original problem and not related to the short that blew out the decade counter. I'll chase this down in another thread. Thanks Brian for kicking me off in the right direction.

Rick

Re: How to Use this Forum ..... ????

tinkera123
 

Okay .... I have been receiving the Daily Summary so that I didn't get 'swamped' by too many emails .... so I am not seeing some of the fields that you and others (via PM's) are seeing ... :)

I will change my Subscription to individual emails for tomorrow and see what happens.

Cheers,
Ian

Re: App Notes

stefan_trethan
 

Perhaps they could use it to demonstrate how their reputation, which
they have exploited over the later decades, was once warranted.

But who knows, maybe they don't want their current contributions,
which sometimes amount to no more than flinging crap at the
competition, measured by that.

ST

On Mon, Mar 5, 2018 at 6:06 AM, Gary Robert Bosworth
<@grbosworth> wrote:
You can't be serious.


On Sat, Mar 3, 2018 at 9:45 PM, Artekmedia <manuals@...> wrote:

Gary
Curious ..... what is the motivation in this day and age for Tektronix to
keep a repository of 30+ year old applications notes?
-DC
manuals@...

On 3/4/2018 12:36 AM, Gary Robert Bosworth wrote:

Thank you Ronald. I hope you can find them. Hard to believe they are not
readily available through Tektronix. Why can't Tektronix maintain a
repository?

Gary

Re: TekScope PDFs

 

I do not think all of them have been scanned yet but Kurt has
everything that I have:

http://w140.com/tekwiki/wiki/Tektronix_Magazines

On Sun, 04 Mar 2018 20:58:26 -0800, you wrote:

Does anyone know a website where I can download ALL of the TekScope publications in PDF format?
Gary

Re: 7603 15+ rail dead. Options?

 

On Mon, 26 Feb 2018 14:24:45 +0000, you wrote:

... and Q926 doesn’t appear to have a specified substitute — though I presume any small NPN transistor capable of handling 60 volts or so would be fine.
Hmm, Q926 is 151-0347-00 6-6&12 which is a 2N5551, 100MHz 160V 600mA
TO-92. You might get away with a 2N4401 selected for high Vceo but
one of the many high voltage TO-92 parts is the way to go and the
2N5551 is still produced and the best option.

Is there any good reason why I can't simply obtain +15 v from a 2 amp 15 volt regulator chip — like an L78S15CS — and ignore the +15v sense line?
The regulators are designed to track each other so that would not be a
good idea. If there was a short on the -50 volt supply which is used
as a reference, the +15 volt supply is suppose to drop.