1: Pin:2-4 or 7 of the 5651 for 87v.
2. Measure from wiper of R716 to the chassis and adjust to look for a change. If there is:
3. Check pin #6 on V712 and adjust again, to see if it makes a difference. if it does:
4. Measure Pin 1 of V700 while adjusting and see if that makes a diffence. If it does:

5. Measure Pin 7 of V725 while adjusting and see if that makes a difference. If it does:
6. Measure from pin 1 to pin 9 on V725

I'll report the first measurement is in a few minutes.

Thanks,

Dave

Thanks,

Dave

:Hello All,
: I will be reporting the measurements asked for by Edd in the next message in this thread. Right now I have the oscillator tube unplugged so I wont be bothered with the high voltage and one of 6080s unplugged so I wont be bothered by the smoking resistor.
: Right now the symptom is -170v on the -150 v line. No matter how I adjust the -150v control the voltage stays at -170v.
: I checked the control and it seems to work fine. Now on to voltage check number
:
:1: Pin:2-4 or 7 of the 5651 for 87v.
:2. Measure from wiper of R716 to the chassis and adjust to look for a change. If there is:
:3. Check pin #6 on V712 and adjust again, to see if it makes a difference. if it does:
:4. Measure Pin 1 of V700 while adjusting and see if that makes a diffence. If it does:
:
:5. Measure Pin 7 of V725 while adjusting and see if that makes a difference. If it does:
:6. Measure from pin 1 to pin 9 on V725
:
:I'll report the first measurement is in a few minutes.
:
:Thanks,
:
:Dave
:

Thanks,

Dave
:Hello Again All,
: Measurement number 1: -85 v Between Pin 2,4 or 7 and the chassis on the V5651. Does the 3 volts make any difference?
:
:Thanks,
:
:Dave
:
::Hello All,
:: I will be reporting the measurements asked for by Edd in the next message in this thread. Right now I have the oscillator tube unplugged so I wont be bothered with the high voltage and one of 6080s unplugged so I wont be bothered by the smoking resistor.
:: Right now the symptom is -170v on the -150 v line. No matter how I adjust the -150v control the voltage stays at -170v.
:: I checked the control and it seems to work fine. Now on to voltage check number
::
::1: Pin:2-4 or 7 of the 5651 for 87v.
::2. Measure from wiper of R716 to the chassis and adjust to look for a change. If there is:
::3. Check pin #6 on V712 and adjust again, to see if it makes a difference. if it does:
::4. Measure Pin 1 of V700 while adjusting and see if that makes a diffence. If it does:
::
::5. Measure Pin 7 of V725 while adjusting and see if that makes a difference. If it does:
::6. Measure from pin 1 to pin 9 on V725
::
::I'll report the first measurement is in a few minutes.
::
::Thanks,
::
::Dave
::
:

Thanks,

Dave
:Hello Again All,
: Skipping to measurement 3, since I initially did measurement 2, When I measure pin 6 of V712 and adjust I can adjust from -100v to -103v. For a split second I see 79 v when the control is all the way in one direction but I guess the voltage regulator tube pulls it right back up. Since I do see some changes when I adjust, I will continue with measurement number 4.
: Sorry about all the messages. But I'm making the measurements one at a time. Between tests I shut off the scope so I can re-test the turn on relay. It continues to work like a champ now that the contacts are "clean".
:
:Thanks,
:
:Dave
::Hello Again All,
:: Measurement number 1: -85 v Between Pin 2,4 or 7 and the chassis on the V5651. Does the 3 volts make any difference?
::
::Thanks,
::
::Dave
::
:::Hello All,
::: I will be reporting the measurements asked for by Edd in the next message in this thread. Right now I have the oscillator tube unplugged so I wont be bothered with the high voltage and one of 6080s unplugged so I wont be bothered by the smoking resistor.
::: Right now the symptom is -170v on the -150 v line. No matter how I adjust the -150v control the voltage stays at -170v.
::: I checked the control and it seems to work fine. Now on to voltage check number
:::
:::1: Pin:2-4 or 7 of the 5651 for 87v.
:::2. Measure from wiper of R716 to the chassis and adjust to look for a change. If there is:
:::3. Check pin #6 on V712 and adjust again, to see if it makes a difference. if it does:
:::4. Measure Pin 1 of V700 while adjusting and see if that makes a diffence. If it does:
:::
:::5. Measure Pin 7 of V725 while adjusting and see if that makes a difference. If it does:
:::6. Measure from pin 1 to pin 9 on V725
:::
:::I'll report the first measurement is in a few minutes.
:::
:::Thanks,
:::
:::Dave
:::
::
:

Thanks,

Dave
:Hello All Again,
: This is the test from pin 1 of V700 to the chassis. No matter how I adjust the control, I can see a change for a split second and it always changes right back to -121.6 volts and it is insistent upon that voltage.
:
:Thanks,
:
:Dave
::Hello Again All,
:: Skipping to measurement 3, since I initially did measurement 2, When I measure pin 6 of V712 and adjust I can adjust from -100v to -103v. For a split second I see 79 v when the control is all the way in one direction but I guess the voltage regulator tube pulls it right back up. Since I do see some changes when I adjust, I will continue with measurement number 4.
:: Sorry about all the messages. But I'm making the measurements one at a time. Between tests I shut off the scope so I can re-test the turn on relay. It continues to work like a champ now that the contacts are "clean".
::
::Thanks,
::
::Dave
:::Hello Again All,
::: Measurement number 1: -85 v Between Pin 2,4 or 7 and the chassis on the V5651. Does the 3 volts make any difference?
:::
:::Thanks,
:::
:::Dave
:::
::::Hello All,
:::: I will be reporting the measurements asked for by Edd in the next message in this thread. Right now I have the oscillator tube unplugged so I wont be bothered with the high voltage and one of 6080s unplugged so I wont be bothered by the smoking resistor.
:::: Right now the symptom is -170v on the -150 v line. No matter how I adjust the -150v control the voltage stays at -170v.
:::: I checked the control and it seems to work fine. Now on to voltage check number
::::
::::1: Pin:2-4 or 7 of the 5651 for 87v.
::::2. Measure from wiper of R716 to the chassis and adjust to look for a change. If there is:
::::3. Check pin #6 on V712 and adjust again, to see if it makes a difference. if it does:
::::4. Measure Pin 1 of V700 while adjusting and see if that makes a diffence. If it does:
::::
::::5. Measure Pin 7 of V725 while adjusting and see if that makes a difference. If it does:
::::6. Measure from pin 1 to pin 9 on V725
::::
::::I'll report the first measurement is in a few minutes.
::::
::::Thanks,
::::
::::Dave
::::
:::
::
:

Dave
:Hello Again All,
: I see that the 12B4 tubes require 100 volts from the 100 volt supply. The 100 volt supply uses the same 6080 tube (other section) as the 225 volt supply where there is the burning resistor. The 6080 is unplugged so the resistor wont burn and there is no 100 volt supply. So I will have to put the 6080 back in. Do I need to let the resistor (R756) burn or can I disconnect it from the circuit? R756 has now gone up to 18 ohms after burning the last time. It's probably ready to crack in half. So if I have to use it, I will have to re-replace it. I think I only have one or two more NOS resistors that look like the original.
: It looks like I can disconnect one end of the resistor and the 100 volt supply should be ok. Am I correct?
:
:Thanks,
:
:Dave
::Hello All Again,
:: This is the test from pin 1 of V700 to the chassis. No matter how I adjust the control, I can see a change for a split second and it always changes right back to -121.6 volts and it is insistent upon that voltage.
::
::Thanks,
::
::Dave
:::Hello Again All,
::: Skipping to measurement 3, since I initially did measurement 2, When I measure pin 6 of V712 and adjust I can adjust from -100v to -103v. For a split second I see 79 v when the control is all the way in one direction but I guess the voltage regulator tube pulls it right back up. Since I do see some changes when I adjust, I will continue with measurement number 4.
::: Sorry about all the messages. But I'm making the measurements one at a time. Between tests I shut off the scope so I can re-test the turn on relay. It continues to work like a champ now that the contacts are "clean".
:::
:::Thanks,
:::
:::Dave
::::Hello Again All,
:::: Measurement number 1: -85 v Between Pin 2,4 or 7 and the chassis on the V5651. Does the 3 volts make any difference?
::::
::::Thanks,
::::
::::Dave
::::
:::::Hello All,
::::: I will be reporting the measurements asked for by Edd in the next message in this thread. Right now I have the oscillator tube unplugged so I wont be bothered with the high voltage and one of 6080s unplugged so I wont be bothered by the smoking resistor.
::::: Right now the symptom is -170v on the -150 v line. No matter how I adjust the -150v control the voltage stays at -170v.
::::: I checked the control and it seems to work fine. Now on to voltage check number
:::::
:::::1: Pin:2-4 or 7 of the 5651 for 87v.
:::::2. Measure from wiper of R716 to the chassis and adjust to look for a change. If there is:
:::::3. Check pin #6 on V712 and adjust again, to see if it makes a difference. if it does:
:::::4. Measure Pin 1 of V700 while adjusting and see if that makes a diffence. If it does:
:::::
:::::5. Measure Pin 7 of V725 while adjusting and see if that makes a difference. If it does:
:::::6. Measure from pin 1 to pin 9 on V725
:::::
:::::I'll report the first measurement is in a few minutes.
:::::
:::::Thanks,
:::::
:::::Dave
:::::
::::
:::
::
:

Hello Dave,

I have not been able to follow your posts for some time so forgive me if I repeat something.

The problem you are describing on th e-150 supply is characteristic of a NO LOAD condition. One end of the adjustment pot connects to ground through R718, 68K and the other end of the pot connects to -150V through R715, 50K. Have you checked these resistors?

The other possibility is there is too much gain in the regulator circuit. Have you checked R719, 470K, R712, 100K and R713, 1K?

Gary

:Hello All,
: I'm posting again so that it will show up in November's posts. Later today, I'll remove the burning resistor and put the 6080 back in and make the measurements all over again.
:
:Dave
::Hello Again All,
:: I see that the 12B4 tubes require 100 volts from the 100 volt supply. The 100 volt supply uses the same 6080 tube (other section) as the 225 volt supply where there is the burning resistor. The 6080 is unplugged so the resistor wont burn and there is no 100 volt supply. So I will have to put the 6080 back in. Do I need to let the resistor (R756) burn or can I disconnect it from the circuit? R756 has now gone up to 18 ohms after burning the last time. It's probably ready to crack in half. So if I have to use it, I will have to re-replace it. I think I only have one or two more NOS resistors that look like the original.
:: It looks like I can disconnect one end of the resistor and the 100 volt supply should be ok. Am I correct?
::
::Thanks,
::
::Dave
:::Hello All Again,
::: This is the test from pin 1 of V700 to the chassis. No matter how I adjust the control, I can see a change for a split second and it always changes right back to -121.6 volts and it is insistent upon that voltage.
:::
:::Thanks,
:::
:::Dave
::::Hello Again All,
:::: Skipping to measurement 3, since I initially did measurement 2, When I measure pin 6 of V712 and adjust I can adjust from -100v to -103v. For a split second I see 79 v when the control is all the way in one direction but I guess the voltage regulator tube pulls it right back up. Since I do see some changes when I adjust, I will continue with measurement number 4.
:::: Sorry about all the messages. But I'm making the measurements one at a time. Between tests I shut off the scope so I can re-test the turn on relay. It continues to work like a champ now that the contacts are "clean".
::::
::::Thanks,
::::
::::Dave
:::::Hello Again All,
::::: Measurement number 1: -85 v Between Pin 2,4 or 7 and the chassis on the V5651. Does the 3 volts make any difference?
:::::
:::::Thanks,
:::::
:::::Dave
:::::
::::::Hello All,
:::::: I will be reporting the measurements asked for by Edd in the next message in this thread. Right now I have the oscillator tube unplugged so I wont be bothered with the high voltage and one of 6080s unplugged so I wont be bothered by the smoking resistor.
:::::: Right now the symptom is -170v on the -150 v line. No matter how I adjust the -150v control the voltage stays at -170v.
:::::: I checked the control and it seems to work fine. Now on to voltage check number
::::::
::::::1: Pin:2-4 or 7 of the 5651 for 87v.
::::::2. Measure from wiper of R716 to the chassis and adjust to look for a change. If there is:
::::::3. Check pin #6 on V712 and adjust again, to see if it makes a difference. if it does:
::::::4. Measure Pin 1 of V700 while adjusting and see if that makes a diffence. If it does:
::::::
::::::5. Measure Pin 7 of V725 while adjusting and see if that makes a difference. If it does:
::::::6. Measure from pin 1 to pin 9 on V725
::::::
::::::I'll report the first measurement is in a few minutes.
::::::
::::::Thanks,
::::::
::::::Dave
::::::
:::::
::::
:::
::
:

Thanks,

Dave
:
:
:

: : : : : : :Sir David. . . . . : : : : :AhhhhSoooo . . . . . I see where this thread has finally ended up, so I will just make my add on at this point. : : : : : : :Hello All, : : :I will be reporting the measurements asked for by Edd in the next message in this thread. Right now I have the oscillator tube unplugged so I wont be bothered with the high voltage and one of 6080s unplugged so I wont be bothered by the smoking resistor. :Right now the symptom is -170v on the -150 v line. No matter how I adjust the -150v control the voltage stays at -170v. : : :I checked the control and it seems to work fine. : : :Now on to voltage check number : : : :1: Pin:2-4 or 7 of the 5651 for 87v. . . .Edd : : : :Measurement number 1: -85 v Between Pin 2,4 or 7 and the chassis on the V5651. Does the 3 volts make any difference? . . .Dave : : : :No, that is fine, that gas tube regulator IS doing its job. . . .Edd : : : :2. Measure from wiper of R716 to the chassis and adjust to look for a change. If there is: : : : :Skipping to measurement 3, since I initially did measurement 2 : : : :Roger- Roger : : : :3. Check pin #6 on V712 and adjust again, to see if it makes a difference. if it does: : : : :When I measure pin 6 of V712 and adjust I can adjust from -100v to -103v. : : :For a split second I see 79 v when the control is all the way in one direction but I guess the voltage regulator tube pulls it :right back up. : : : :I think this will be related to a fault your 100 v supply voltage, is its 6080 back in circuit ?. : : : :4. Measure Pin 1 of V700 while adjusting and see if that makes a difference. If it does: : : : :This is the test from pin 1 of V700 to the chassis. No matter how I adjust the control, I can see a change for a split second and it always changes right back to -121.6 volts and it is insistent upon that voltage. : : : :Also, what I believe to be a fallacy in the level of an adjunct supply. : : : :5. Measure Pin 7 of V725 while adjusting and see if that makes a difference. If it does: : : : :Needless to say, prior faults in the regulator loop made this an impossibility : : : : : : :O.K. Looks like you did just fine , up to that point of voltage discreptancy. : : : :Good job in supplying all of the required info possible, up to this point. : : :What will be needed now is the moving over to the over heating resistor at the raw DC supply feeding the +225 V circuitry :and its input circuitry. : : :What is needed there is to "Take a load off Fannie" by the shunting of that now rated 18 ohm resistor ( seems like you initially had it being at 8 ohms) with a 27 ohm value to bring the pair down to 10.8 ohms. : : : OR just pull that original and tack in a 10 ohm 5 watt wirewound in there until the problem is solved. : : :Now since you seem so good in working with a numbered procedure: : : :I think that the main prob now is having that -150 being at -170 and the effect that it is having in its being interlocked as a referencing or to be used to get a full voltage swing on the other supplies, : : :Sooooo. PUT ALL OF YOUR 6080's in their sockets, : : :Plug in the Sweep oscillator tube so that it will be adding its loading down the power supply again. : : :After initially getting the "hot resistor" situation abated: : : :1 . . .Give us the voltage readings from the output nodes of the: : : :500V supply . . . . . : : :350 V supply . . . . . : : :225V supply . . . . . : : :100 V supply . . . . . : : :-150 supply, which is our problem child and expect to still be -170. : : :Now I would be wanting the output voltages from the RAW DC SUPPLY points for these supplies: : : :1 . . . . . : : :The Voltage that is across Filter C790, (that is providing only a PORTION of a series string up voltages, that build up to an accumulated +600 volt level, to then be regulated down to the +500 supply. : : :2 . . . . . : : :The voltage that is read across Filter C780 Positive terminal AND the metering negative lead goes to the Positive terminal of Filter :C756, (this is another series stringing and the only way to read that desired voltage). : : :3 . . . . . : : :The voltage that is read across Filter C756 Positive terminal AND the metering negative lead goes to the Positive terminal of Filter :C740 or C741, (this is another series stringing and the only way to read the desired voltage). : : :4 . . . . . : : :The voltage that is read across Filter C740 or C741 , (no probem here, as this is the bottom leg of ALL of the series stringing of the supplies. ) : : : :4 . . . . . : : :The voltage that is read across Filter C732. (no probem here, also, as this is the raw DC supply for your stand alone -150 v :supply. ) : : : :With all of the voltages read on those points now go back up to their associative input /current limiting resistors and measure ACROSS then so that we can then compute and see the current demands of each supply node. (With our particular interest, now being directed towards that +225 V supply ) : : : : :The relevant resistor/or/ resistor pairs are: : : : :500V supply . . . . . R790 : : :350 V supply . . . . .R780/R777 : : :225V supply . . . . . R756 . . .Recognize that resistor # ? : : :100 V supply . . . . .R740 : : :-150 supply . . . . . R732/R733 : : : :Gimme me that data and I will mark up the working schema and be using those figures for analysis. : : : :THENNNNNN, I will show you how to " pull " the -150 supply to get it to a proper - 150 value, and then see if the other supplies will then fall more fully into accordance, if appreciably off. : : :(Will be needing an ~ 100 K linear potentiometer on hand.) : : : : : :73's de Edd : : : : : : :

:
:
:
:
:
:

: :[ [ [ [ [ [ [ . . . WORKING SCHEMATIC OF TEK 545 PS . . . ] ] ] ] ] ] : : : : : : : : :

:
:
:
:
:
:
:Hello Dave,
::
::I have not been able to follow your posts for some time so forgive me if I repeat something.
::
::The problem you are describing on th e-150 supply is characteristic of a NO LOAD condition. One end of the adjustment pot connects to ground through R718, 68K and the other end of the pot connects to -150V through R715, 50K. Have you checked these resistors?
::
::The other possibility is there is too much gain in the regulator circuit. Have you checked R719, 470K, R712, 100K and R713, 1K?
::
::Gary
::
:::Hello All,
::: I'm posting again so that it will show up in November's posts. Later today, I'll remove the burning resistor and put the 6080 back in and make the measurements all over again.
:::
:::Dave
::::Hello Again All,
:::: I see that the 12B4 tubes require 100 volts from the 100 volt supply. The 100 volt supply uses the same 6080 tube (other section) as the 225 volt supply where there is the burning resistor. The 6080 is unplugged so the resistor wont burn and there is no 100 volt supply. So I will have to put the 6080 back in. Do I need to let the resistor (R756) burn or can I disconnect it from the circuit? R756 has now gone up to 18 ohms after burning the last time. It's probably ready to crack in half. So if I have to use it, I will have to re-replace it. I think I only have one or two more NOS resistors that look like the original.
:::: It looks like I can disconnect one end of the resistor and the 100 volt supply should be ok. Am I correct?
::::
::::Thanks,
::::
::::Dave
:::::Hello All Again,
::::: This is the test from pin 1 of V700 to the chassis. No matter how I adjust the control, I can see a change for a split second and it always changes right back to -121.6 volts and it is insistent upon that voltage.
:::::
:::::Thanks,
:::::
:::::Dave
::::::Hello Again All,
:::::: Skipping to measurement 3, since I initially did measurement 2, When I measure pin 6 of V712 and adjust I can adjust from -100v to -103v. For a split second I see 79 v when the control is all the way in one direction but I guess the voltage regulator tube pulls it right back up. Since I do see some changes when I adjust, I will continue with measurement number 4.
:::::: Sorry about all the messages. But I'm making the measurements one at a time. Between tests I shut off the scope so I can re-test the turn on relay. It continues to work like a champ now that the contacts are "clean".
::::::
::::::Thanks,
::::::
::::::Dave
:::::::Hello Again All,
::::::: Measurement number 1: -85 v Between Pin 2,4 or 7 and the chassis on the V5651. Does the 3 volts make any difference?
:::::::
:::::::Thanks,
:::::::
:::::::Dave
:::::::
::::::::Hello All,
:::::::: I will be reporting the measurements asked for by Edd in the next message in this thread. Right now I have the oscillator tube unplugged so I wont be bothered with the high voltage and one of 6080s unplugged so I wont be bothered by the smoking resistor.
:::::::: Right now the symptom is -170v on the -150 v line. No matter how I adjust the -150v control the voltage stays at -170v.
:::::::: I checked the control and it seems to work fine. Now on to voltage check number
::::::::
::::::::1: Pin:2-4 or 7 of the 5651 for 87v.
::::::::2. Measure from wiper of R716 to the chassis and adjust to look for a change. If there is:
::::::::3. Check pin #6 on V712 and adjust again, to see if it makes a difference. if it does:
::::::::4. Measure Pin 1 of V700 while adjusting and see if that makes a diffence. If it does:
::::::::
::::::::5. Measure Pin 7 of V725 while adjusting and see if that makes a difference. If it does:
::::::::6. Measure from pin 1 to pin 9 on V725
::::::::
::::::::I'll report the first measurement is in a few minutes.
::::::::
::::::::Thanks,
::::::::
::::::::Dave
::::::::
:::::::
::::::
:::::
::::
:::
::
: