Voltage check problem [resolved]

[BillB]

Hello, I ran the voltage checks on my StereomourII build, and all the numbers came out very close except for #7. My meter reads 0. It should read 170_230 VDC. I ran through the entire build step by step again and found no bad solder joints, touching wires, or mistakes. Any suggestions? Thanks much.

[Paul Birkeland]

This may be fairly easy to debug with a couple of build photos.

What DC voltage do you get at IA on the C4S board?

[BillB]

Paul, I get 410.

[Paul Birkeland]

Some build photos will probably help here.

-PB

[BillB]

Here's the photo Paul

[Paul Birkeland]

If you pull the 12AT7 out of that side, does the voltage pop up?

[BillB]

No change after pulling 12at7, still 0. I earlier switched the 12at7 tubes, still 0.

[Paul Birkeland]

This is very likely to be a solder joint issue on the C4S board.  I would reflow all of the joints other than the ones for the LEDs (they don't take much heat to solder properly).

[BillB]

 Paul, good call! All the voltage numbers check out. Thanks for your expertise.