Date   

Re: TM500 tester switch - Attn. Jared Cabot.

Colin Herbert
 

Ah, But that order was from Mouser, not DigiKey like mine. My switch was just in a bubble-wrap bag in another plastic bag.
Colin.

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Shaun M
Sent: 24 October 2021 19:37
To: TekScopes@groups.io
Subject: Re: [TekScopes] TM500 tester switch - Attn. Jared Cabot.

Colin,

I purchased the parts for this project from Mouser in January of this year. The Grayhill switch we are discussing arrived packed a plastic tube and included the pins, stickers and paper instructions for configuring it.

Shaun M


Re: tek 2215 trace position issues

nanovnauser@...
 

Well i hooked up the eht to the crt and moved the whole lot to one side,heres a few readings i took,on q387 base i get 8.8v,it should be 2.6!,r290 wiper measures as follows,fully cw=3.44,fully ccw 3.4v,r190 is fully cw3.4,fully ccw 3.4v,dont know if this helps?


Re: 465B recapping and tantalum caps

n4buq
 

Hi Dave,

I think the subject has come up and I _think_ the filter sections for both are the same - or at least with very little changes but I can't really be sure.

Send me your address and I'll get a board out to you if you still want one. You can send me a couple of bucks to cover costs if you want but not a big deal.

Thanks,
Barry - N4BUQ

----- Original Message -----
From: "David Austerman" <737builder@gmail.com>
To: "tekscopes" <TekScopes@groups.io>
Sent: Sunday, October 24, 2021 4:49:48 PM
Subject: Re: [TekScopes] 465B recapping and tantalum caps
Barry-
I haven't looked and compared 465 and 465B board layouts on the prints, but I
figure you might have been down the road before of being asked if these are
compatible with a 465? If so, how would I obtain one of these? Do you have a
website? I have a 465 that is working fine with original electros right now
anyway, but you know how that goes. I'd like to maybe get ahead of the problem,
or at the very least be ready if I put it off until that fateful day. I might
actually not procrastinate if I had a nice little board!
Thanks, dave austerman KG5IPO



Re: 465B recapping and tantalum caps

David Austerman
 

Barry-
I haven't looked and compared 465 and 465B board layouts on the prints, but I figure you might have been down the road before of being asked if these are compatible with a 465? If so, how would I obtain one of these? Do you have a website? I have a 465 that is working fine with original electros right now anyway, but you know how that goes. I'd like to maybe get ahead of the problem, or at the very least be ready if I put it off until that fateful day. I might actually not procrastinate if I had a nice little board!
Thanks, dave austerman KG5IPO


Re: FS: 7000 series (parts) plugins 7A18 (X2) 7B53A and 067-0657 Calibration Fixture

Oz-in-DFW
 

All plugins have been spoken for. I'll relist anything that falls through.

Thanks, and sorry for any confusion I caused by missing posted replies.

--
Oz (in DFW, Texas USA) N1OZ


Re: TDS3012 and up

John Gord
 

The main boards for the TDS30xx 4 channel units are different from the 2 channel units. I don't think there is any (practical) way to convert a TDS3012 to a TDS3014 without a total main board transplant.
--John Gord

On Thu, Oct 21, 2021 at 02:27 PM, <durechenew@yahoo.com> wrote:


Gentlemen,
I while back I informed here that I'm trying to revive a TDS3012; essentially
that was done with good results.
That scope came to me with Rack Mount RM3000 (includes all the hardware to
install the scope) that doesn't have room (or usage) in my 'lab' (let's call
it that); it's in fairly good shape and if someone has a need for it, can have
it for postage (that might mean something, I'm in Toronto, Ontario, Canada).

The main subject is different: assuming there would be available another
TDS3012, what would be the challenges (from electronic point of view -
disregard mechanical stuff), to convert to a TDS3014? I believe Håkan is one
of the people with a lot of info and knowledge about these scopes and I'd love
to hear his opinion. Anyone else interested or with knowledge is invited to
share opinion; I believe is doable.
All the best to all
TT


Re: TM500 tester switch - Attn. Jared Cabot.

Shaun M
 

Colin,

I purchased the parts for this project from Mouser in January of this year. The Grayhill switch we are discussing arrived packed a plastic tube and included the pins, stickers and paper instructions for configuring it.

Shaun M


Re: TM500 tester switch - Attn. Jared Cabot.

Colin Herbert
 

Has anyone else had this problem with switches from DigiKey, or am I alone?
Colin.

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Colin
Herbert via groups.io
Sent: 23 October 2021 15:38
To: TekScopes@groups.io
Subject: [TekScopes] TM500 tester switch - Attn. Jared Cabot.

Hi Jared,

I have now (eventually) got what all of the parts for this tester seem to
be. I am however a bit puzzled about the Grayhill switch. Mine doesn't seem
to have anything other than the switch, internal tooth lockwasher and
mounting nut present. I see that you used a set of limiter pins and a foil
sticker to retain them, but these items do not appear with my switch. Such
pins and sticker do not appear on the DigiKey list either, as far as I can
see. Did you actually use the proper Grayhill items and do DigiKey stock
them? If not, how might I go about getting the switch to correctly be a
4-pole, 6-turn switch?

Colin.


Re: TDS3044B repair

 

You posted that message in a thread with a different name: "TDS3012 and up".
That's unnecessarily confusing.
Your question was about converting a two-channel TDS3012 to a 4-channel version (TDS3014). I can imagine that not a lot of people would be able to answer such a question, knowing that precious little is known about these 'scopes technically, both hardware- and firmware-wise.

Raymond


Re: TDS3044B repair

durechenew@...
 

I posted a message (it is actually a new post, #187365), that, for unknown reasons, was not broadcasted (or nobody had a reason to answer or comment); thought to mention it here, maybe it's still of some interest to someone or there are some people that would like to know more on the subject; or have info to share (I'm sure about that).
Regards
TT


Re: Newbie with a 466 that won't sweep

Andreas Ragner
 

Hi Richard,
I checked my notes and found the following:

" Tektronix 466 Repair (October 2013):
466 early model, Timing circuit board A7, signal 'A' SWP START LEVEL to Q1002A
C1115 shorted (Tantal, 100µF/20V), replaced by AL-Electrolytic 220µF/35V "

Symptom of the 466 was no horizontal sweep, but vertical deflection was ok.
I chose the capacitor just by looking for a most close value fit in my new parts box.
The solder side of the A7 board is reachable only by dismantling.
As I did not plan to carry the scope around in a car (i.e. no shaking and rattling),
I made the repair process straightforward. The tantalum has been cut just at the body.
I soldered the capacitor to the remaining standoffs.

Regards, Andreas


Re: tek 2215 trace position issues

nanovnauser@...
 

I currently have the crt removed,is it ok to power the cope on with the crt removed,or do i need to connect the anode eht to prevent arcing?


Re: 465B recapping and tantalum caps

pdxareaid
 

On Sat, Oct 23, 2021 at 11:02 AM, Ozan wrote:


It looks like there are two alternate locations for the thermistor.
yep, i see that now. odd but REALLY resolved now. thanks, phil


Re: 465B recapping and tantalum caps

Ozan
 

On Sat, Oct 23, 2021 at 10:12 AM, pdxareaid wrote:


On Sat, Oct 23, 2021 at 10:00 AM, pdxareaid wrote:


"The mysterious cap you mention is a 50 ohm thermistor in parallel with the
27
ohm resistor."

thanks Mark. I have seen no documentation of that thermistor. How do you
know
this? Where can i look? Did i just miss something simple?
Ahhh...i see it now in the circuit diagram. it is just not depicted on the A4
board for some reason. Thanks.
-------

It is RT4373, on A4 board diagram it is shown to the left of R4373 trimpot. In your picture if you look at the same location there are two empty solder islands, instead the thermistor is in the "mystery component" location. Tracing connection in the picture shows it is parallel to R4374 (27-ohm) which matches the schematic. It looks like there are two alternate locations for the thermistor.

Ozan


Re: 465B recapping and tantalum caps

pdxareaid
 

On Sat, Oct 23, 2021 at 10:00 AM, pdxareaid wrote:


"The mysterious cap you mention is a 50 ohm thermistor in parallel with the 27
ohm resistor."

thanks Mark. I have seen no documentation of that thermistor. How do you know
this? Where can i look? Did i just miss something simple?
Ahhh...i see it now in the circuit diagram. it is just not depicted on the A4 board for some reason. Thanks.


Re: 465B recapping and tantalum caps

pdxareaid
 

On Sat, Oct 23, 2021 at 08:00 AM, Mark Vincent wrote:


C4331 is 47mfd. It should be 25V or 35V. Using a larger value, 100mfd 25V ULD
for example, will work.
I agree the V rating should be higher. even 25V seems a little low but 35+ is likely sufficient.


Re: 465B recapping and tantalum caps

pdxareaid
 

"The mysterious cap you mention is a 50 ohm thermistor in parallel with the 27 ohm resistor."

thanks Mark. I have seen no documentation of that thermistor. How do you know this? Where can i look? Did i just miss something simple?


TDS784C early serial number firmware?

Jared Cabot
 

Hi all,
I'm currently running firmware 5.2e on my TDS784C scope, but I've heard there is a version 5.3(x) floating around.
Does anyone have a copy of this firmware, or have a scope with this version that they can dump it from via GPIB? (I can provide the simple commands to do so).
Or even any versions that aren't on tekwiki, we may as well post them up there for future reference.

https://w140.com/tekwiki/wiki/TDS784

Thanks!


Re: TM500 tester switch - Attn. Jared Cabot.

Jared Cabot
 

Hi,

I had the pins and sticker supplied with the switch when I purchased it. Maybe they forgot to include them with the switch when packing them?
All you really need is a two short bits of wire to stick in the holes as shown in the manual to limit the rotation. I think some tinned copper wire, piano wire or even a bit of paperclip could work if it fits.
Some cello-tape would work fine to replace the sticker I think.

Jared


Re: 465B recapping and tantalum caps

Mark Vincent
 

C4331 is 47mfd. It should be 25V or 35V. Using a larger value, 100mfd 25V ULD for example, will work.

The mysterious cap you mention is a 50 ohm thermistor in parallel with the 27 ohm resistor.

Mark

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