PJCCS

Tubeman · 52973

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Offline Tubeman

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Reply #15 on: May 12, 2022, 10:21:27 AM
Yes.
Here are the test voltages with the A and B connections reversed:

IA 34.9V
IB 34.9V
A6 24V
B6 34.2V
A5 2.8V
B5 1.7V
« Last Edit: June 10, 2022, 06:36:37 AM by Paul Birkeland »


Offline Paul Birkeland

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Reply #16 on: May 12, 2022, 10:25:32 AM
This tells you there's something wrong outside the PJCCS.  It could be something simple like a battery in backwards or a tube that is rather dead, so perhaps the best next step would be to swap 3S4s between sides to see if the bad voltage moves back to the A output of the PJCCS.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline Tubeman

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Reply #17 on: May 12, 2022, 10:40:23 AM
If I swap the tubes the tubes the test voltages on the A and B side stay the same and I verified that the D batteries are installed correctly.
The maddening thing is that the preamp functions perfectly with the 4K plate resistor installed.


Offline Paul Birkeland

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Reply #18 on: May 12, 2022, 10:43:14 AM
Can you show photos of the entire build with the PJCCS installed?

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline Tubeman

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Reply #19 on: June 10, 2022, 06:13:45 AM
Paul,

I believe that the problem was probably a defective PCB.
I built another PJCCCS kit that I had and installed it on the Quickie according to the updated assembly manual that you sent me and the test voltages are correct and the preamp functions properly.
Thank you for emailing me the updated manual.


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