On Thu, Feb 17, 2022 at 05:24 PM, Dave Wise wrote:
My manual scan covers serial numbers from the beginning to at least 10760.
During that time, the 130 used a 6BH6 for V110, Guard Voltage Cathode
Follower. It was always a 6BH6 and nothing else was ever a 6BH6. The V70
Multivibrator has always been a 6U8. The V76 Clamp Tube is ¡°Use 6DJ8¡± so
early instruments were probably 6BQ7, an older dual triode that Tek globally
replaced with 6DJ8 because the latter is more reliable.
Printed on chassis of S/N 8069: "V76 6DJ8/6922 6BQ7A". Albert
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My manual scan covers serial numbers from the beginning to at least 10760. During that time, the 130 used a 6BH6 for V110, Guard Voltage Cathode Follower. It was always a 6BH6 and nothing else was ever a 6BH6. The V70 Multivibrator has always been a 6U8. The V76 Clamp Tube is ¡°Use 6DJ8¡± so early instruments were probably 6BQ7, an older dual triode that Tek globally replaced with 6DJ8 because the latter is more reliable. If the multivibrator is not switching, then the input may not be swinging past one of the threshold voltages, upper or lower. What¡¯s the frequency and amplitude of the AC part of the input waveform? What are the DC voltages? Dave Wise From: [email protected] < [email protected]> On Behalf Of SCMenasian via groups.io Sent: Thursday, February 17, 2022 5:12 AM To: [email protected]Subject: Re: [TekScopes] Type 130 L-C Meter Jerome, Are you sure the clamp tube should be a 6DJ8? I have a 130 (which I have converted to solid state) and the clamp tube is a 6BH6. Of course the 130 went through several iterations and your version may very well have a 6DJ8. The schematic I have shows a 6BH6 and the writing on the chassis near the tube socket says 6BH6. Mine worked well (until the main electrolytic capacitor in the power supply gave up the ghost); so, I'm fairly sure my tube is good. I am in Pennsylvania and can ship it to you for a nominal price, at your suggestion, including shipping. Stephen Menasian
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Re: RTM/TM 506 Fan replacement
Well, mine is actually a very old one... I bought it decades ago.
Its much quiter because it doesn't run on nominal speed, the supply in the TM506 or TM5006 giving only 110V to the fan. The remaining noise is mainly from the bearings.
cheers
Martin
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Will respond to you gentlemen when I get off of hell....er, work. Thank you
so much. You are amazing.
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On Thu, Feb 17, 2022, 8:11 AM SCMenasian <scm@...> wrote: Jerome,
Are you sure the clamp tube should be a 6DJ8? I have a 130 (which I have
converted to solid state) and the clamp tube is a 6BH6. Of course the 130
went through several iterations and your version may very well have a 6DJ8.
The schematic I have shows a 6BH6 and the writing on the chassis near the
tube socket says 6BH6. Mine worked well (until the main electrolytic
capacitor in the power supply gave up the ghost); so, I'm fairly sure my
tube is good. I am in Pennsylvania and can ship it to you for a nominal
price, at your suggestion, including shipping.
Stephen Menasian
|
Jerome,
Are you sure the clamp tube should be a 6DJ8? I have a 130 (which I have converted to solid state) and the clamp tube is a 6BH6. Of course the 130 went through several iterations and your version may very well have a 6DJ8. The schematic I have shows a 6BH6 and the writing on the chassis near the tube socket says 6BH6. Mine worked well (until the main electrolytic capacitor in the power supply gave up the ghost); so, I'm fairly sure my tube is good. I am in Pennsylvania and can ship it to you for a nominal price, at your suggestion, including shipping.
Stephen Menasian
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Re: RTM/TM 506 Fan replacement
I have also replaced mine a few years ago with one (220v) I bought from my local electronics store.
I can¡¯t tell you the make off the top of my head, but it¡¯s much, much quieter than the original one.
I can only imagine that anything modern and new you replace it with will make a huge improvement.
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bonjour ¨¤ tous
Have 130 LC since 1980s, from LLNL salvage was $0.30/lb,
Still working fine, uniquely wide,capacity compensation 75,pF.
generally the problems in older valve equipment is often leaky or open electrolytics, carbon composition resistors that drift higher, or were overloaded, and defective paper, oil or plastic capacitors.
hope this note,helps you
Jon
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Re: RTM/TM 506 Fan replacement
I replaced the fan in my TM506 an TM5006 with 220volt Papst models. Mechanically identical, very quit.
As to the airflow: as long as the temperature of the outgoing air is moderate I do not see any problem. The modules remain cool compared to a TM503 without fans. And I usually do not operate the frame when ambient temperatures are above 35¡ãC - due to overheating of brains :-)
cheers
Martin
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VintageTek received permission to post the three-part article. See
There's also a beautifully restored manual as well.
--Cheers,
Tom
--
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
350 Jane Stanford Way
Stanford University
Stanford, CA 94305-4070
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On 2/16/2022 22:09, Kerry Burns wrote: Hello Jerome
In 2020 Silicon Chip magazine did a three part restoration feature on the Type 130.
The link to the first part is
Unfortunately it costs to access the full articles ¡¡
Regards
Kerry
From: <[email protected]> on behalf of Jerome D Leach <jeromeleach17@...>
Reply to: <[email protected]>
Date: Thursday, 17 February 2022 at 2:39 pm
To: <[email protected]>
Subject: [TekScopes] Type 130 L-C Meter
Greetings fellows.
Had this 130 for several years and decided to finally repair it.
Replaced all the paper capacitors, and the filter caps. have little
ripple so left them in.
Powered up, the needle moves up to zero, then drops back down slightly.
No effect when coarse adjust is manipulated. Checked PS voltages, and
they appear reasonable: +150 comes in at +149.9. The +270 unregulated is
a bit low at 257.8. Used the 'scope and determined that both the
variable and fixed oscillators are working along with the mixer. Good
waveform into the grid of V70B, a 6U8 used as the multivibrator. Looking
at the waveform on pin 6 of the 6U8 on my Tek 561A, I can manipulate the
coarse and fine adjust knobs on the faceplate and vary the frequency so
I assume everything back to the input UHF jack is fine. Output is pin 6
of V70A, and should be a square wave, but is a flat line. Checked all
the PS voltages going into V70 and they are fine. All components appear
good with no evidence of overheating, etc. Changed out the tube with two
other brand new 6U8s with no joy.
Looked at the clamp circuit and it's tube, a 6DJ8. All associated
discreet components look fine, and the supply voltages are correct.
Changed out the 6DJ8 with a couple known good tubes and still no joy.
Am a definite novice at diagnosing electronic circuits, so could use a
bit of advice as to what to look for.
Thanks folks.
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Hello Jerome In 2020 Silicon Chip magazine did a three part restoration feature on the Type 130. The link to the first part is Unfortunately it costs to access the full articles ¡¡ Regards Kerry From: < [email protected]> on behalf of Jerome D Leach <jeromeleach17@...> Reply to: < [email protected]> Date: Thursday, 17 February 2022 at 2:39 pm To: < [email protected]> Subject: [TekScopes] Type 130 L-C Meter Greetings fellows. Had this 130 for several years and decided to finally repair it. Replaced all the paper capacitors, and the filter caps. have little ripple so left them in. Powered up, the needle moves up to zero, then drops back down slightly. No effect when coarse adjust is manipulated. Checked PS voltages, and they appear reasonable: +150 comes in at +149.9. The +270 unregulated is a bit low at 257.8. Used the 'scope and determined that both the variable and fixed oscillators are working along with the mixer. Good waveform into the grid of V70B, a 6U8 used as the multivibrator. Looking at the waveform on pin 6 of the 6U8 on my Tek 561A, I can manipulate the coarse and fine adjust knobs on the faceplate and vary the frequency so I assume everything back to the input UHF jack is fine. Output is pin 6 of V70A, and should be a square wave, but is a flat line. Checked all the PS voltages going into V70 and they are fine. All components appear good with no evidence of overheating, etc. Changed out the tube with two other brand new 6U8s with no joy. Looked at the clamp circuit and it's tube, a 6DJ8. All associated discreet components look fine, and the supply voltages are correct. Changed out the 6DJ8 with a couple known good tubes and still no joy. Am a definite novice at diagnosing electronic circuits, so could use a bit of advice as to what to look for. Thanks folks.
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Hi Jerome,
That's a nice unit and definitely worth fixing.
V70 is a straightforward Schmitt trigger, and there's not a lot that can go wrong. Measure voltages on the tube pins. Measure resistances (R72 and R73 in particular). If they've drifted far upward (including going open-circuit altogether), that would certainly kill the Schmitt. You'll find something quite obvious from those measurements.
Good luck!
-- Cheers,
Tom
--
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
350 Jane Stanford Way
Stanford University
Stanford, CA 94305-4070
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On 2/16/2022 19:14, Jerome D Leach wrote: Greetings fellows.
Had this 130 for several years and decided to finally repair it. Replaced all the paper capacitors, and the filter caps. have little ripple so left them in.
Powered up, the needle moves up to zero, then drops back down slightly. No effect when coarse adjust is manipulated. Checked PS voltages, and they appear reasonable: +150 comes in at +149.9. The +270 unregulated is a bit low at 257.8. Used the 'scope and determined that both the variable and fixed oscillators are working along with the mixer. Good waveform into the grid of V70B, a 6U8 used as the multivibrator. Looking at the waveform on pin 6 of the 6U8 on my Tek 561A, I can manipulate the coarse and fine adjust knobs on the faceplate and vary the frequency so I assume everything back to the input UHF jack is fine. Output is pin 6 of V70A, and should be a square wave, but is a flat line. Checked all the PS voltages going into V70 and they are fine. All components appear good with no evidence of overheating, etc. Changed out the tube with two other brand new 6U8s with no joy.
Looked at the clamp circuit and it's tube, a 6DJ8. All associated discreet components look fine, and the supply voltages are correct. Changed out the 6DJ8 with a couple known good tubes and still no joy.
Am a definite novice at diagnosing electronic circuits, so could use a bit of advice as to what to look for.
Thanks folks.
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Crap, pin 6 on the brain. Input of V70 is pin 9, output is 6.
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On 2/16/22 22:14, Jerome D Leach via groups.io wrote: Greetings fellows.
Had this 130 for several years and decided to finally repair it. Replaced all the paper capacitors, and the filter caps. have little ripple so left them in.
Powered up, the needle moves up to zero, then drops back down slightly. No effect when coarse adjust is manipulated. Checked PS voltages, and they appear reasonable: +150 comes in at +149.9. The +270 unregulated is a bit low at 257.8. Used the 'scope and determined that both the variable and fixed oscillators are working along with the mixer. Good waveform into the grid of V70B, a 6U8 used as the multivibrator. Looking at the waveform on pin 6 of the 6U8 on my Tek 561A, I can manipulate the coarse and fine adjust knobs on the faceplate and vary the frequency so I assume everything back to the input UHF jack is fine. Output is pin 6 of V70A, and should be a square wave, but is a flat line. Checked all the PS voltages going into V70 and they are fine. All components appear good with no evidence of overheating, etc. Changed out the tube with two other brand new 6U8s with no joy.
Looked at the clamp circuit and it's tube, a 6DJ8. All associated discreet components look fine, and the supply voltages are correct. Changed out the 6DJ8 with a couple known good tubes and still no joy.
Am a definite novice at diagnosing electronic circuits, so could use a bit of advice as to what to look for.
Thanks folks.
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Quick update here: It turns out that there are 2 Python modules exporting the name "serial", one called serial, one called pyserial. I had to do "Python -m pip uninstall serial", followed by " Python -m pip install pyserial" before it worked. Found this by searching for the error message.
I was able to download exactly 1 WF from my 468 using the micro-pro based AR488 controller (configured as a controller) but after that no more communication.
A while ago, I posted this on eevblog:
================
I was able to talk to a Tektronix 468 (with GPIB option) using the micro-pro version of AR488 (thanks so much for this design).
The program I used was the Prologix Configurator from KE5FX (this means I had to change the AR488 version string to match prologix).
The 468 was configured as device 3 and the TALKONLY option was DISABLED.
Commands I issued before turning the 468 on:
++addr 3
++srqauto 1
++eor 7
The 468 (which is ONLY a talker, not a listener) issues an SRQ value 1 on startup (called Power On SRQ).
==============
the AR488 handles this SRQ using these settings. With this setting, the GPIB LED on the side of the 468 is turned off because the "Power On SRQ" request is now handled.
-Jan-
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Greetings fellows.
Had this 130 for several years and decided to finally repair it. Replaced all the paper capacitors, and the filter caps. have little ripple so left them in.
Powered up, the needle moves up to zero, then drops back down slightly. No effect when coarse adjust is manipulated. Checked PS voltages, and they appear reasonable: +150 comes in at +149.9. The +270 unregulated is a bit low at 257.8. Used the 'scope and determined that both the variable and fixed oscillators are working along with the mixer. Good waveform into the grid of V70B, a 6U8 used as the multivibrator. Looking at the waveform on pin 6 of the 6U8 on my Tek 561A, I can manipulate the coarse and fine adjust knobs on the faceplate and vary the frequency so I assume everything back to the input UHF jack is fine. Output is pin 6 of V70A, and should be a square wave, but is a flat line. Checked all the PS voltages going into V70 and they are fine. All components appear good with no evidence of overheating, etc. Changed out the tube with two other brand new 6U8s with no joy.
Looked at the clamp circuit and it's tube, a 6DJ8. All associated discreet components look fine, and the supply voltages are correct. Changed out the 6DJ8 with a couple known good tubes and still no joy.
Am a definite novice at diagnosing electronic circuits, so could use a bit of advice as to what to look for.
Thanks folks.
|
I'm trying to get the Python program that John (Twilight-Logic) posted below to run.
I was able to comment out the "termios" lines but now I'm running into a different issue. Python claims that module "serial" has no attribute "Serial":
Python 3.10.2 (tags/v3.10.2:a58ebcc, Jan 17 2022, 14:12:15) [MSC v.1929 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license()" for more information.
========== RESTART: C:\electronics\Tek468\468plot-main\src\468plot.py ==========
Traceback (most recent call last):
File "C:\electronics\Tek468\468plot-main\src\468plot.py", line 728, in <module>
ser = serial.Serial()
AttributeError: module 'serial' has no attribute 'Serial'
I installed "serial" as follows: Python -m pip install serial
John, thank you so much for your brilliant AR488 design!
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Re: RTM/TM 506 Fan replacement
Michael, thanks for the part number. >May I ask what vendor you sourced >them from? Would the same fan fit my R7603's? I found these as NOS on E-Bay. I have No idea if they will fit the 7603 Rack mount. But I am thinking that they might just work. I have never seen inside a R7603, but looking at the manual the illustration appears very similar to the RTM506 fan. -- Michael Lynch Dardanelle, AR
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Hi Bob,
Thank you very much for your efforts.
I appreciate your help.
I will visit Tekwiki to see what is there.
Regards,
Ken
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On 16Feb, 2022, at 3:36 PM, Bob Haas <robeughaas@...> wrote:
Ken: The vintageTEK Museum has some microfiche, but it's likely it's no more complete than what's already on Tekwiki. I will check the microfiche when I'm next at the Museum, probably Saturday. This is a newer product for which Tek never published detailed service information.
--
Bob Haas
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Re: 311-1430-00 pot wanted for 465 Horiz. position
Bob,
That control should work with the single knob. Let me know how to pay you. Thanks.
Mark
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Ken: The vintageTEK Museum has some microfiche, but it's likely it's no more complete than what's already on Tekwiki. I will check the microfiche when I'm next at the Museum, probably Saturday. This is a newer product for which Tek never published detailed service information.
--
Bob Haas
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Re: 311-1430-00 pot wanted for 465 Horiz. position
Mark: Is it the rotating partial circle for "waiting"? it should come up eventually. If not I've uploaded a photo here: /g/TekScopes/album?id=272717-- Bob Haas
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Martin
Jean-Paul
jrseattle
Mlynch001
Bob Haas