Date   

Re: Tek 576 Curve Tracer HV Transformer winding

Mlynch001
 

Dave,

Any idea how hot this transformer is supposed to run? I can 3D print objects that will withstand up to 125-150F for indefinite periods. Or I can machine the center bobbin out of DELRIN Plastic or PTFE.

--
Michael Lynch
Dardanelle, AR


Re: From 2014: Tektronix Announces Winner of Europe’s Oldest Working Oscilloscope Contest

Dave Wise
 

I'm guilty too!

Do you think the 513 was the military contract (1949-1950) that TekWiki says led to the 517, model not identified in the 517 article?

And note that the non-suffix 513 was distributed; once again, "D" signified Delay Line.

Dave

Those rows of tubes marching off to the horizon are amazing.

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Chuck Harris
Sent: Monday, September 16, 2019 12:06 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] From 2014: Tektronix Announces Winner of Europe’s Oldest Working Oscilloscope Contest

I plea guilty to my brain spontaneously emitting gas about the "D"
being for Distributed. It was, of course, an indication of the delay
line, that allowed you to see the triggering signal.

The 513D, however, announced back in 1949 had a distributed vertical
amplifier containing a host of 6CB6's. That was at least two years
before the 517 showed up in the catalogs.

-Chuck Harris

Dave Wise wrote:
That D suffix indicates Delay line, not Distributed amplifier. (So you could view the edge that triggered the sweep.) Tek's first distributed-amp scope was Type 517.

Dave Wise


Re: 3.5mm connector for SD24 sampling head...

Bruce Atwood
 

[cid:part1.E4A154FB.31B925D5@outlook.com]

On 9/16/2019 10:26 AM, Chuck Harris wrote:

Hi,

I have an SD24 sampling head that is otherwise ok, but has a
3.5mm connector that was banged into a wall by the previous
owner. The connector leading edge is peened over a little bit.

Finding a new connector seems unlikely.

Does anyone out there have a parts unit SD24 or 26 that has a
spare connector?

Thanks!

-Chuck Harris



.



--
Bruce Atwood PhD
Department of Astronomy
The Ohio State University
100 West 18th Ave., Room 4055
Columbus, OH 43210

Phone 614.314.0189
FAX 614.292.2928


Re: Identify the 3-pin Sealectro power Connector from 454 scope for P6045 probe

 

Tom,
I was in a similar circumstance and was able to purchase one from Q-service in Rhodes, Greece.  The price was reasonable.  You might try them.
Bruce, KG6OJI


Re: 11801 NVRAM

Albert Otten
 

On Mon, Sep 16, 2019 at 07:03 PM, Reginald Beardsley wrote:


With a 100 kHz ramp I need a trigger around 99.989 kHz to display the full
ramp for a single cycle. That's a difference in period of ~1.1 ns. Or with a
100 kHz trigger, I need a 100.0108 kHz ramp.
Sorry to disagree with this Reg. The period is 10 us and a shift of 1 period would require about 9000 periods, not 1024. The frequency difference should be a factor 9 larger.
Still my view that the time base accuracy plays no substantial role (in the ps/div range) remains.

Albert

Albert


Re: 11801 NVRAM

Chuck Harris <cfharris@...>
 

Certainly, if they are plugged in.

If they are soldered in, it may take me years longer...

-Chuck Harris



Sergey Kubushyn wrote:

On Mon, 16 Sep 2019, Chuck Harris wrote:

Sorry for jumping in but is it somehow possible to share those ROMs?

I do have 11801C sitting on a shelf with difficult access to it and I'm not
sure it has 1T option that would've been nice to have...

My 11801C, with OPTS 1T (Telecom std masks),

has, Exec: 4.05, Disp: 4.00, Timebase/Controller: 4.03, ACQ1: 9.02, ACQ2: 9.02

-Chuck Harris

Reginald Beardsley via Groups.Io wrote:
My scope is an 11801. That should be visible in the screen photo I posted.
Based on the dates on parts it is 1989 production. It is enough different from
the 11801C that it was obvious from the meager information in the service manual
for the 11801C that I needed an actual an 11801 manual. Zenith was kind enough to
furnish a scan of the 11801 service manual, which is now available online, but I
bought a paper copy.

I currently am triggering off a square wave on one channel of the 33622A while
displaying a ramp from the other channel. There is a periodic jitter in the time
base, so even with an external trigger I cannot get a stable sweep. In 1024 point
mode at 1 ps/div it appears that there are 4-5 subsweeps before it repeats. As a
result the trace oscillates back and forth over a span of about 1.3 ps as it
drifts across the screen. In 5120 point mode it seems to have just 2 subsweeps
with ~1 ps dither between them.

When the OXO heater kicks on everything jumps out of sync for a while. It may
well be that the mystery NVRAM calibration constants are intended to correct the
time offset between the sweeps. IIRC my timebase ROMS have a 1991 or 1992 date,
so it is possible that my scope had a FW update and could be corrected if I knew
where and what values to write with a PROM programmer.

If someone has an 11801C or other newer model open I'd appreciate version and date
information on the timebase board ROMS. But if anyone knows *anything* about this
I'm very interested in investigating. I've got another 11801x in CA at my
sister's house which I'm waiting for her to ship to me. I have had more fun with
my 11801 than any other piece of test gear I've bought. Being able to see
reflections from each side of a high grade SMA-F to N-F adapter is quite amazing.

Have Fun!
Reg




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




Re: 3.5mm connector for SD24 sampling head...

Chuck Harris <cfharris@...>
 

Hi Reg,

The flat cylinder of the nose (that comes just before the thread), has
been smashed almost flat on one side. The mating surfaces (inside of
the connector), appear to be ok, to my calibrated eye.

I have thought about making a little rotary tool that would roll around
the outside edge, and roll the smashed edge back to the proper shape,
as it is pretty soft metal, but I fear that I will spend more time than
the plugin is worth, and destroy the needed accuracy of the APC 3.5mm
connector.

It would seem better to find someone that has an electrically damaged
head that has a good connector, and work out a trade for the connector.

I, of course, have no idea what I will find when I try to replace the
connector. I don't have a clue how it is terminated on the circuit
board... probably the success of such a swap is highly improbable.

-Chuck Harris

Reginald Beardsley via Groups.Io wrote:

How extensive is the damage? If it's just the thread, a fine triangular needle file will fix that.

If the side has been pushed in so it is no longer round, but not too badly damaged, it's a bit more complex, but still a fairly simple repair if you have access to a small lathe with which to make a plug expander to fit inside the connector.

I made one once to fix a friend's flute foot joint which was worn and allowed the foot to fall off. It took a couple of tries to make one that worked, but I'm not a machinist and had no experience. All I had to go on was the concept of a conical plug being pulled into a conical hole which then forced the outer cylinder to expand.

Would you post a close up photo to the files section?

Have Fun!
Reg




Re: 11801 NVRAM

Albert Otten
 

On Sun, Mar 24, 2019 at 01:32 PM, Jack2015 wrote:


I did same mistake last week on my CSA803 when replacing NVRAM on the timebase
board(selftest error code E5322),
the factory calibration data is gone,now when I measure a 100khz signal it
shows me 106Khz,when measure a 1Mhz signal it shows 106Mhz...
I want to know how to fix this problem too.
Jack,

I may have overlooked an answer to this *old* question. The batteries in my CSA803 were dead on arrival. So I also had to replace the batteries (plus chips) without restoring any data. The frequency measurements are still OK. I may have done some user available calibration though.
This is in line with my conclusion that factory calibration constants were introduced in later models.

Albert


Identify the 3-pin Sealectro power Connector from 454 scope for P6045 probe

Tom Li
 

Hello.

I just purchased a vintage Tektronix P6045 FET probe online. It needs +/-12-volt
power and was designed to be powered from a 3-pin Sealectro power connector on
the 454/454A scope, or a 015-0073-00 power supply.

I'd like to use the probe with my digital scope and feed the +/-12-volt power
externally from my own power supply, without using the original one, however,
I cannot find this Sealectro socket to connect my probe.

TekWiki is unable to confirm it either, it says "The 015-0073-00 (power supply) has
a 3-pin probe power connector (Sealectro 55-850-0018-98?)", note the question mark,
and worse, I was unable to find that Sealectro part.

I asked at the EEVBlog Forum [0], and I was advised to replace the probe power cord.
Since it's an early probe, I'd like to keep it as-is, modifying the probe will be my
the last option, Any suggestion on the candidates for the power connector is
appreciated.

(Sorry if it's a double-post, my original mail seems to be dropped due to technical
problems.)

Thanks,
Tom Li

[0] https://www.eevblog.com/forum/testgear/power-connector-for-tektronix-p6045-probe-454a-scope/


Identify the 3-pin Sealectro power Connector from 454 scope for P6045 probe

Tom Li
 

Hello.

I just purchased a vintage Tektronix P6045 FET probe online. It needs +/-12-volt
power and was designed to be powered from a 3-pin Sealectro power connector on
the 454/454A scope, or a 015-0073-00 power supply.

I'd like to use the probe with my digital scope and feed the +/-12-volt power
externally from my own power supply, without using the original one, however,
I cannot find this Sealectro socket to connect my probe.

TekWiki is unable to confirm it either, it says "The 015-0073-00 (power supply) has
a 3-pin probe power connector (Sealectro 55-850-0018-98?)", note the question mark,
and worse, I was unable to find that Sealectro part.

I asked at the EEVBlog Forum [0], and I was advised to replace the probe power cord.
Since it's an early probe, I'd like to keep it as-is, modifying the probe will be my
the last option, Any suggestion on the candidates for the power connector is
appreciated.

Thanks,
Tom Li

[0] https://www.eevblog.com/forum/testgear/power-connector-for-tektronix-p6045-probe-454a-scope/


Re: 11801 NVRAM

Sergey Kubushyn
 

On Mon, 16 Sep 2019, Chuck Harris wrote:

Sorry for jumping in but is it somehow possible to share those ROMs?

I do have 11801C sitting on a shelf with difficult access to it and I'm not
sure it has 1T option that would've been nice to have...

My 11801C, with OPTS 1T (Telecom std masks),

has, Exec: 4.05, Disp: 4.00, Timebase/Controller: 4.03, ACQ1: 9.02, ACQ2: 9.02

-Chuck Harris

Reginald Beardsley via Groups.Io wrote:
My scope is an 11801. That should be visible in the screen photo I posted. Based on the dates on parts it is 1989 production. It is enough different from the 11801C that it was obvious from the meager information in the service manual for the 11801C that I needed an actual an 11801 manual. Zenith was kind enough to furnish a scan of the 11801 service manual, which is now available online, but I bought a paper copy.

I currently am triggering off a square wave on one channel of the 33622A while displaying a ramp from the other channel. There is a periodic jitter in the time base, so even with an external trigger I cannot get a stable sweep. In 1024 point mode at 1 ps/div it appears that there are 4-5 subsweeps before it repeats. As a result the trace oscillates back and forth over a span of about 1.3 ps as it drifts across the screen. In 5120 point mode it seems to have just 2 subsweeps with ~1 ps dither between them.

When the OXO heater kicks on everything jumps out of sync for a while. It may well be that the mystery NVRAM calibration constants are intended to correct the time offset between the sweeps. IIRC my timebase ROMS have a 1991 or 1992 date, so it is possible that my scope had a FW update and could be corrected if I knew where and what values to write with a PROM programmer.

If someone has an 11801C or other newer model open I'd appreciate version and date information on the timebase board ROMS. But if anyone knows *anything* about this I'm very interested in investigating. I've got another 11801x in CA at my sister's house which I'm waiting for her to ship to me. I have had more fun with my 11801 than any other piece of test gear I've bought. Being able to see reflections from each side of a high grade SMA-F to N-F adapter is quite amazing.

Have Fun!
Reg



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


Re: From 2014: Tektronix Announces Winner of Europe’s Oldest Working Oscilloscope Contest

Chuck Harris <cfharris@...>
 

I plea guilty to my brain spontaneously emitting gas about the "D"
being for Distributed. It was, of course, an indication of the delay
line, that allowed you to see the triggering signal.

The 513D, however, announced back in 1949 had a distributed vertical
amplifier containing a host of 6CB6's. That was at least two years
before the 517 showed up in the catalogs.

-Chuck Harris

Dave Wise wrote:

That D suffix indicates Delay line, not Distributed amplifier. (So you could view the edge that triggered the sweep.) Tek's first distributed-amp scope was Type 517.

Dave Wise


Re: 11801 NVRAM

Chuck Harris <cfharris@...>
 

My 11801C, with OPTS 1T (Telecom std masks),

has, Exec: 4.05, Disp: 4.00, Timebase/Controller: 4.03, ACQ1: 9.02, ACQ2: 9.02

-Chuck Harris

Reginald Beardsley via Groups.Io wrote:

My scope is an 11801. That should be visible in the screen photo I posted. Based on the dates on parts it is 1989 production. It is enough different from the 11801C that it was obvious from the meager information in the service manual for the 11801C that I needed an actual an 11801 manual. Zenith was kind enough to furnish a scan of the 11801 service manual, which is now available online, but I bought a paper copy.

I currently am triggering off a square wave on one channel of the 33622A while displaying a ramp from the other channel. There is a periodic jitter in the time base, so even with an external trigger I cannot get a stable sweep. In 1024 point mode at 1 ps/div it appears that there are 4-5 subsweeps before it repeats. As a result the trace oscillates back and forth over a span of about 1.3 ps as it drifts across the screen. In 5120 point mode it seems to have just 2 subsweeps with ~1 ps dither between them.

When the OXO heater kicks on everything jumps out of sync for a while. It may well be that the mystery NVRAM calibration constants are intended to correct the time offset between the sweeps. IIRC my timebase ROMS have a 1991 or 1992 date, so it is possible that my scope had a FW update and could be corrected if I knew where and what values to write with a PROM programmer.

If someone has an 11801C or other newer model open I'd appreciate version and date information on the timebase board ROMS. But if anyone knows *anything* about this I'm very interested in investigating. I've got another 11801x in CA at my sister's house which I'm waiting for her to ship to me. I have had more fun with my 11801 than any other piece of test gear I've bought. Being able to see reflections from each side of a high grade SMA-F to N-F adapter is quite amazing.

Have Fun!
Reg




Re: 11801 NVRAM

Chuck Harris <cfharris@...>
 

I'm sorry Reg, I thought you had a "C" model.

I agree, they are fun to play with.

I will try to check my "C" for the information
you need.

-Chuck Harris

Reginald Beardsley via Groups.Io wrote:

My scope is an 11801. That should be visible in the screen photo I posted. Based on the dates on parts it is 1989 production. It is enough different from the 11801C that it was obvious from the meager information in the service manual for the 11801C that I needed an actual an 11801 manual. Zenith was kind enough to furnish a scan of the 11801 service manual, which is now available online, but I bought a paper copy.

I currently am triggering off a square wave on one channel of the 33622A while displaying a ramp from the other channel. There is a periodic jitter in the time base, so even with an external trigger I cannot get a stable sweep. In 1024 point mode at 1 ps/div it appears that there are 4-5 subsweeps before it repeats. As a result the trace oscillates back and forth over a span of about 1.3 ps as it drifts across the screen. In 5120 point mode it seems to have just 2 subsweeps with ~1 ps dither between them.

When the OXO heater kicks on everything jumps out of sync for a while. It may well be that the mystery NVRAM calibration constants are intended to correct the time offset between the sweeps. IIRC my timebase ROMS have a 1991 or 1992 date, so it is possible that my scope had a FW update and could be corrected if I knew where and what values to write with a PROM programmer.

If someone has an 11801C or other newer model open I'd appreciate version and date information on the timebase board ROMS. But if anyone knows *anything* about this I'm very interested in investigating. I've got another 11801x in CA at my sister's house which I'm waiting for her to ship to me. I have had more fun with my 11801 than any other piece of test gear I've bought. Being able to see reflections from each side of a high grade SMA-F to N-F adapter is quite amazing.

Have Fun!
Reg




Re: Tek 576 Curve Tracer HV Transformer winding

Dave Wise
 

I made the bobbin flanges for my 453 rewind out of sanded-off CD's. Cheap abundant source of 0.050" polycarbonate sheet.

FWIW,
Dave Wise

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Mlynch001
Sent: Sunday, September 15, 2019 5:53 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Tek 576 Curve Tracer HV Transformer winding

Success! I jacked the oven up to 350 and went for broke. My wife yelled "I smell something" so I figured it was hot enough. Gave it a twist as instructed and it popped apart. One outer leg had already fallen off, so I am thinking that the core was already cracked by the earlier attempt. No harm, no foul, super glue to the rescue.

I APPRECIATE all the advice that was given. A special thanks to Chuck Harris for his concise instructions. Now to figure out how to make and wind a new bobbin.

Sincerely,

--
Michael Lynch
Dardanelle, AR


Re: 561B Recapping

widgethunter <tubesnthings@...>
 

If it aint broke don't fix it!!!Running several 561As & 565 in original condition with NO issues.That is the norm for 500 series gear.Bernie Schroder

-----Original Message-----
From: Glydeck via Groups.Io <glydeck=aol.com@groups.io>
To: TekScopes <TekScopes@groups.io>
Sent: Sun, Sep 15, 2019 5:15 pm
Subject: Re: [TekScopes] 561B Recapping

I would be interested as well. — George
On Sep 15, 2019, at 1:17 PM, David Holland <david.w.holland@gmail.com> wrote:

Anyone recapped a Tektronix 561B, and have some pointers for capacitor
replacement specifications?  (ESR/DF & ripple current ratings
particularly)

Looking up the Tektronix part numbers will lead to NSN numbers, which
will give original manufacturers, (Sprague/Mallory), and purported
original part numbers, that I can not find references to.

There's nothing I'm aware of specifically wrong with the scope at the
moment, other than 47 years on those caps - based on the 1972 date
codes, and a serial # in the B19xxx range.

There is also 2 (of 3) tantalum capacitors that don't seem to be
de-rated particularly well (C11 & C31). - (Yes, they look like
tantalum, the NSN's say they are tant., and their tiny physical size
strongly implies it as well.)

I've a DER DE-5000 and a HV supply (Eico 950B) so I could pull them
and measure DF/ESR/leakage/etc to my hearts content, but if I'm going
to remove them, I'd just as soon put new caps back in circuit.

Suggestions? Comments? Cries of Derision?

Thanks,

David



Re: 3.5mm connector for SD24 sampling head...

Reginald Beardsley
 

How extensive is the damage? If it's just the thread, a fine triangular needle file will fix that.

If the side has been pushed in so it is no longer round, but not too badly damaged, it's a bit more complex, but still a fairly simple repair if you have access to a small lathe with which to make a plug expander to fit inside the connector.

I made one once to fix a friend's flute foot joint which was worn and allowed the foot to fall off. It took a couple of tries to make one that worked, but I'm not a machinist and had no experience. All I had to go on was the concept of a conical plug being pulled into a conical hole which then forced the outer cylinder to expand.

Would you post a close up photo to the files section?

Have Fun!
Reg


Re: From 2014: Tektronix Announces Winner of Europe’s Oldest Working Oscilloscope Contest

Dave Wise
 

That D suffix indicates Delay line, not Distributed amplifier. (So you could view the edge that triggered the sweep.) Tek's first distributed-amp scope was Type 517.

Dave Wise

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Chuck Harris
Sent: Sunday, September 15, 2019 6:57 AM
To: TekScopes@groups.io
Subject: Re: [TekScopes] From 2014: Tektronix Announces Winner of Europe’s Oldest Working Oscilloscope Contest

The 310 is close, but no cigar.

The 511 was the original Tek scope, the 511AD was a
later refined model, with a distributed vertical amplifier.

My working (?) 513D is probably older than Alan's 511AD.

I give it a ? because although I went over it completely
about 30 years ago, it has the selenium rectifiers, which
tend to turn into insulators.

According to Stan G's book:

511 last catalog 1952
511AD last catalog 1955
513 last catalog 1953
513D last catalog 1953

310 last catalog 1958
310A last catalod 1971

-Chuck Harris

Dave Daniel wrote:
Hmmm.. I have (and had back in 2014) a working 310.

As cool as an MDO would be, and not that I want a 'scope that I can't repair when
(not if) it breaks, but there have to be hundreds of owners of vintage Tektronix
'scopes out there that own working 'scopes that are older than the 511 cited in the
post, Europe or not.

I don't recall hearing of this "contest". It is weird that it did not come to light
while it was in progress. Does anyone have any information about the the contest itself?

DaveD


Re: 11801 NVRAM

Reginald Beardsley
 

Albert,

The signal is 20 mVpp, so that is the full ramp in the image. I just posted more in response to Bob Koller.

My calculation of the frequencies required is not correct. Not sure what I got wrong. With the settings I gave I get a flat trace across the screen which slowly rises and then starts over at the bottom. I'm guessing I calculated the frequencies such that each sweep was a constant offset from the trigger.

With a 100 kHz ramp I need a trigger around 99.989 kHz to display the full ramp for a single cycle. That's a difference in period of ~1.1 ns. Or with a 100 kHz trigger, I need a 100.0108 kHz ramp.

I've never dealt with such extreme aliasing before and normally I am considering the frequency domain effects. So this will take some thought.

Have Fun!
Reg


Re: PM for a working Tek 577 with D1 storage Curve Tracer

Mlynch001
 

Kevin,

My 577 had been sitting for some time in storage. It had some balky switches. I have found that cleaning those switches with non-working latches will bring them back to proper function. This is a common switch, used in almost all Contemporary TEK instruments. I buy many so called "non-working" instruments that need only thorough cleaning of these type switches to restore their function.

--
Michael Lynch
Dardanelle, AR

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