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On Mon, 02 Apr 2018 16:37:31 -0700, you wrote:

Thanks. I tried some typeface detection websites but even they couldn't come up with anything. It looks like the model numbers are in a different typeface?

All simple to draw, or so I thought. I used calipers on the spines and tried to reproduce the letters with Open Office Draw, but it's a terrible tool to play with.

I'll try CAD tools next. Ideally I'd like a tool where I have separate X and Y scaling, so I can compensate for any printing discrepancies.

I've used corel draw to generate a font. That may work for you.

Harvey

I can try drawing the letters as an RF trace in Allegro, I have precise control over widths and bends. But the K has a slight curve.

I've always wondered how this was printed back in the day. Some other manuals look like it was hot-stamped into the plastic.

Now that I look closer at the Tektronix manual, it looks like it could be a full size decal. That's what I'm trying, I bought some laser printer decal sheets and going to give it a try.

Donation made.

Thanks,

Shaun Merrigan

File a complaint with e-Bay. If you have
evidence, they will come down on the seller.

73, Dick, W1KSZ

On Mon, Apr 2, 2018, 5:54 PM snapdiode via Groups.Io <snapdiode=
[email protected]> wrote:

So about 15 years ago I made a 1S1 manual in Word by scanning the original
in three passes, to end up with OCR'd text, B/W diagrams, grayscale
pictures, and 11x17 color schematic pages.
I made it into a PDF and it ended up on BAMA.as a free download.



Which is fine, but now I see this on eBay




I can see by the thumbnail this is my PDF.

Is it too much to expect some sort of credit for the work of creating that
PDF?

Besides I keep finding typos and graphical oddities in the document.

So about 15 years ago I made a 1S1 manual in Word by scanning the original in three passes, to end up with OCR'd text, B/W diagrams, grayscale pictures, and 11x17 color schematic pages.
I made it into a PDF and it ended up on BAMA.as a free download.



Which is fine, but now I see this on eBay



I can see by the thumbnail this is my PDF.

Is it too much to expect some sort of credit for the work of creating that PDF?

Besides I keep finding typos and graphical oddities in the document.

Lee, thanks so much for your help, repeated trial fits, and great photos that clearly showed what needed to be changed. I'm glad the final product worked out for you.


I'm looking forward to working with you on feet for the 24XX family!


Jeff


________________________________
From: [email protected] <[email protected]> on behalf of Lee Houde <houdatto@...>
Sent: Thursday, March 29, 2018 7:15 PM
To: [email protected]
Subject: Re: [TekScopes] Back feet for 335 scope

Hi Jeff - I got the final version of the feet today & put them on my 335,
they fit and look beautiful!

I'm going to look through my collection of 2445's to see if I can find one
good foot to send you a picture of. I'm guessing they are a high breakage
rate part and likely common for the 24xx family so probably a fair demand.
They are a fairly large part though; they run vertically up the back of the
scope on either side so they are close to 6" high, 1/2" wide and 1-1/2 inch
deep. They are not solid though, there is a lot of open space. Kind of like
a tall, skinny, rectangular letter "D" with tabs at all four corners.

On Thu, Mar 29, 2018 at 4:50 PM, Jeff Davis <n0dyjeff@...> wrote:

Good thought. If Bert doesn't do that, I will when I get the photos.


________________________________
From: [email protected] <[email protected]> on behalf of
toby@... <toby@...>
Sent: Thursday, March 29, 2018 1:31 PM
To: [email protected]
Subject: Re: [TekScopes] Back feet for 335 scope

On 2018-03-29 3:19 PM, Jeff Davis wrote:

Hi Bert,


I think you want to send the photos to me, not Lee (Lee was test fitting

the feet on his 335). I was the one who

sent you the samples. You can send the photos to me at

n0dyjeff@... or jeff@....

Thanks!

Jeff

It might be good to post pics to the gallery here, for other people
contemplating ordering replacement feet?

--T

On Mon, 2 Apr 2018, Dennis Tillman W7PF wrote:

I made my donation couple of days ago and encourage everybody to do the same
for a good cause.

I was not clear in my original post. For the past year the museum board has
been evaluating the best way to make their invaluable collection of
microfiche available to Tek collectors. This microfiche collection has the
potential to become the most comprehensive and valuable archive we have to
support our interests.



It was the board's conclusion, having already investigated or tried
everything (and more) that our members have suggested, that the only
possible way to make the microfiche available was through a YouCaring
Fundraiser.



They are asking for your financial help reaching their goal of $6,000. It
isn't hard to understand how unlocking the information contained in the
museum's microfiche is in our own self-interest.



I just made a $50 donation towards the microfiche scanner. I hope you will
consider making a donation as well. The process is simple, you can pay by
credit card, and your donation is tax deductible. The donation link is:





Finally, the museum could do much more if they had additional volunteers who
are able to work at the museum. They have a long list of projects and an
acute shortage of volunteer manpower. If there is any way you can volunteer
please contact the museum at contactus@...
<mailto:contactus@...> .

Dennis Tillman W7PF

TekScopes Moderator and Co-Owner



---



The vintageTEK museum has an extensive microfiche collection and has
launched a YouCaring fundraiser to help purchase a microfiche scanner to be
able to digitize portions of the collection. Tektronix for decades released
documentation to the field on microfiche. While some of this information has
been made public, we know specific documentation was only released on
microfiche.



Today the museum can view the information but is unable to digitize it to be
able to support restorations, research, and customer inquiries. Please
contribute to the museum fundraiser campaign. Any amount is appreciated.



The museum operates solely by the support of volunteers, contributions, and
modest ebay sales. The museum does not charge for tours or special events so
your contributions are essential. vintageTEK is a 501(c)(3) charity so all
donations are 100% tax deductible under section 170 of the IRS code.



Please see our blog at

<>
for more
information or visit our YouCaring fundraiser site at
<>
www.youcaring.com/Vintagetek-fiche

< <>
>



Thank you for your support and contribution.



vintageTEK

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

Thanks, Phil. I'm glad they worked out for you! And thanks very much for the inspiration to start the project.

Jeff

________________________________
From: [email protected] <[email protected]> on behalf of Phillip Potter <p.potter@...>
Sent: Friday, March 30, 2018 12:00 PM
To: [email protected]
Subject: Re: [TekScopes] Back feet for 335 scope

Hi Jeff,

Just a quick note to let you know that I received the 335 back feet and
they are "perfect!" in fit and finish. The included screws and washers
are "icing on the cake" and make it even better!

I will be setting up for some photographs in the near future.

Thanks,

Phil


On 3/30/2018 6:59 AM, Jeff Davis wrote:

I uploaded the photos taken from having the feet installed on Bert's 314 to the photo gallery this morning. The album name is "Tektronix 314 and 335 Replacement Feet"


Jeff

________________________________
From: [email protected] <[email protected]> on behalf of toby@... <toby@...>
Sent: Thursday, March 29, 2018 1:31 PM
To: [email protected]
Subject: Re: [TekScopes] Back feet for 335 scope

On 2018-03-29 3:19 PM, Jeff Davis wrote:

Hi Bert,


I think you want to send the photos to me, not Lee (Lee was test fitting the feet on his 335). I was the one who
sent you the samples. You can send the photos to me at n0dyjeff@... or jeff@....


Thanks!

Jeff

It might be good to post pics to the gallery here, for other people
contemplating ordering replacement feet?

--T

On 2018-04-02 7:37 PM, snapdiode via Groups.Io wrote:

Thanks. I tried some typeface detection websites but even they couldn't come up with anything. It looks like the model numbers are in a different typeface?

Yes, they are set separately, and apparently in a slightly inconsistent
set of faces (since they're all done at different times).

All simple to draw, or so I thought. I used calipers on the spines and

tried to reproduce the letters with Open Office Draw, but it's a
terrible tool to play with.


It's all a question of how close you want it. I'd be happy to help
redraw the TEKTRONIX INC characters in say Illustrator -- but after all
that effort you'd still be stuck for model number setting.

I think I could find a commercial $$ font that is fairly close, but I
assume you'd prefer a free font? That narrows it down a lot -- and few
free fonts are very high quality. However I did find this free font:


Of course it's not exactly the same, but it looks quite attractive, and
I'd argue it's probably close enough.

--Toby

I'll try CAD tools next. Ideally I'd like a tool where I have separate X and Y scaling, so I can compensate for any printing discrepancies.

I can try drawing the letters as an RF trace in Allegro, I have precise control over widths and bends. But the K has a slight curve.

I've always wondered how this was printed back in the day. Some other manuals look like it was hot-stamped into the plastic.

Now that I look closer at the Tektronix manual, it looks like it could be a full size decal. That's what I'm trying, I bought some laser printer decal sheets and going to give it a try.

I was not clear in my original post. For the past year the museum board has
been evaluating the best way to make their invaluable collection of
microfiche available to Tek collectors. This microfiche collection has the
potential to become the most comprehensive and valuable archive we have to
support our interests.



It was the board's conclusion, having already investigated or tried
everything (and more) that our members have suggested, that the only
possible way to make the microfiche available was through a YouCaring
Fundraiser.



They are asking for your financial help reaching their goal of $6,000. It
isn't hard to understand how unlocking the information contained in the
museum's microfiche is in our own self-interest.



I just made a $50 donation towards the microfiche scanner. I hope you will
consider making a donation as well. The process is simple, you can pay by
credit card, and your donation is tax deductible. The donation link is:





Finally, the museum could do much more if they had additional volunteers who
are able to work at the museum. They have a long list of projects and an
acute shortage of volunteer manpower. If there is any way you can volunteer
please contact the museum at contactus@...
<mailto:contactus@...> .

Dennis Tillman W7PF

TekScopes Moderator and Co-Owner



---



The vintageTEK museum has an extensive microfiche collection and has
launched a YouCaring fundraiser to help purchase a microfiche scanner to be
able to digitize portions of the collection. Tektronix for decades released
documentation to the field on microfiche. While some of this information has
been made public, we know specific documentation was only released on
microfiche.



Today the museum can view the information but is unable to digitize it to be
able to support restorations, research, and customer inquiries. Please
contribute to the museum fundraiser campaign. Any amount is appreciated.



The museum operates solely by the support of volunteers, contributions, and
modest ebay sales. The museum does not charge for tours or special events so
your contributions are essential. vintageTEK is a 501(c)(3) charity so all
donations are 100% tax deductible under section 170 of the IRS code.



Please see our blog at

<>
for more
information or visit our YouCaring fundraiser site at
<>
www.youcaring.com/Vintagetek-fiche

< <>
>



Thank you for your support and contribution.



vintageTEK

On Mon, Apr 2, 2018 at 04:16 pm, Reed Dickinson wrote:

If resonance cannot be achieved at about 21KHz

It would be nice to able to really drive it at that frequency. My idea should work though. Part of the thing is to get enough voltage up to see if the CRT is shorted.

On Mon, Apr 2, 2018 at 03:29 am, John Brown wrote:

So there may (probably?) be other issues.

You can almost bet on it. I detest that type of power supply when it is self oscillating, but they are efficient when they work.

So either the transistors are underdriven or overloaded. There is no snubber capacitance to be at fault, the circuit really doesn't have an inductive kick like single ended ones.

If it proves to be the drive, hope it is C 1841/1834 or the resistors across them. In fact they warrant a quick check before going to other trouble. And the load on CR 1832/1833, or the diodes themselves.

(one of my JURB techniques if not)

I would find an audio amp and feed T 1960 with it. Whichever winding you choose to backfeed depends on the power of the amp. About a 3 KHz square wave should drive it well enough and probably won't destroy the amp. If you can't drive it to the full voltages they should at least be proportionately low. Watch that amp for heat buildup, they are not made for 3 KHz square waves, if current doesn't get it dv/dt could.

If you get proportional outputs from that side of the PS look at the drive. There isn't much to slow it down. (take that both ways :-)

I see the thing has current limiting but sometimes they sit there too long running into a short and go poof, maybe from heat if nothing else.

I see it senses beam current, HV current and the cathode of the CRT, but that isn't necessarily used for protection. I didn't read the theory of operation, if you can find the right section it might be worth a look.

I have original (bound paper) Tek Common Design Catalogs

#1 (October 1982): Semiconductors (includes Integrated Circuits)

#2 (June 1983): Mechanical



I am looking for Volumes 5 and 6

#5: Resistors and capacitors

#6: Wire, Insulation, Power Supplies



If anyone is interested in a trade please contact me off list at dennis at
ridesoft dot com

Dennis Tillman W7PF

Hi, I m from Argentina. I m repairing a 2445B. When I turn on it, the panel control lamps flashing one time only. The TRC never drawing anything.
I check the J119 voltages, for example....pin # 1. (-15V) I read -14,6V (+/- 0.2V) pin #8 I read 82V (+/- 0.3V) etc etc etc. The readouts are nearby but are not exactly.

Any suggestions?

Thanks.-

Thanks. I tried some typeface detection websites but even they couldn't come up with anything. It looks like the model numbers are in a different typeface?

All simple to draw, or so I thought. I used calipers on the spines and tried to reproduce the letters with Open Office Draw, but it's a terrible tool to play with.

I'll try CAD tools next. Ideally I'd like a tool where I have separate X and Y scaling, so I can compensate for any printing discrepancies.

I can try drawing the letters as an RF trace in Allegro, I have precise control over widths and bends. But the K has a slight curve.

I've always wondered how this was printed back in the day. Some other manuals look like it was hot-stamped into the plastic.

Now that I look closer at the Tektronix manual, it looks like it could be a full size decal. That's what I'm trying, I bought some laser printer decal sheets and going to give it a try.

Hi John:

My Tek Common Design Parts Catalog shows the Jedec part number as 2N6308. There are probably NTE replacements for the 2N6308. You should also replace all the associated diodes around the switching transistors with 1N4007 ones. They are rated 1KV at 1A, an overkill but a big safety margin. With an oscillator at about 21KHz test the resonant circuit components L1835 and C1835, they should display minimum impedance at resonance. Unsolder the anode end of CR1848 and go between TP1835 and pin 2 of P1960 to make this test. If resonance cannot be achieved at about 21KHz then one component of the resonant circuit is defective and a severe impedance mismatch exists between the power inverter circuit and T1960.

Reed Dickinson

I got a 7B53A in decent conditions. It seems in a good working state with one exception: the (broken) slider that selects "mixed mode" in delayed sweep, it's actuated by pulling the little red knob coaxial with the time-base knob.

I've posted three photos showing the case : /g/TekScopes/album?id=42160

Does anyone know where to find a possible replacement? Discarding the hypothesis of finding another 7B53A as a donor?
I'm thinking (as an extreme case) to install a miniature lever switch on the front of the plugin (making an appropriate hole) and wire it to the pcb pads after removing the old slider piece ...
Any suggestion is welcome.
Max

Hello,

This email message is a notification to let you know that a file has been uploaded to the Files area of the [email protected] group.

File: TEK Part Number System.pdf

Uploaded By: Robert Hay

Description:
Tektronix Part Number alphabetical and numerical reference (1984)

You can access this file at the URL:
/g/TekScopes/files/TEK%20Part%20Number%20System.pdf

Cheers,
The Groups.io Team

I have requested that Groups.io provide a search capability for the photo
albums.



This seems like a simple request since the albums are already in
alphabetical order and since they already provide search capability for many
other things.



Dennis Tillman W7PF

TekScopes Moderator

Albert,
Thanks for the heads up... my remarks just after your quote.

On Fri, Mar 30, 2018 at 01:12 pm, Albert Otten wrote:

Fabio, 151-0271-00 is not a matched pair, so Tek didn't judge that necessary .
20 mV difference is not important at all since these transistors are current
driven at the emitter. The transistors in the previous pair Q2405/2505 have
(or should have) enough headroom in Vce (maybe check this). This also explains
that you see no difference in collector signal. Difference in hfe could do
more harm perhaps, though I also doubt this.
A suitable replacement would be 2N4261. Sphere has a few new in stock under
151-0434-00, $6 each. In the cross ref also listed as 151-0271-00.

As you will see on my other reply to Roger, I managed to make the proper vertical LF step response right, by using the LF adjustments there are on the vertical plugin.
Those transistors though, seem to have become less important (but opportunely, I will try to find a replacement).
I also found, on the Tek semiconductor x-ref, that there seem to be a difference between the part 151-0271-00 and the 151-0434-00.
While the latter is indeed a direct equivalent to the 2N4261, it seems the 151-0271-00 is a variation of the 4261, which they called the A5T-4261.
The a5T kind is an 80mA Ic part, while the vanilla 2n4261 is a 30mA part.
The A5T has a TO-92 package and seems also to be capable of dissipating more power as well (0.5W against 0.2W the TO-72A package of the 2n4261).

Krgrds,

Fabio

I set this on top during extended run time periods. /g/TekScopes/photo/37195/10?p=Name,,,20,1,0,0