Speedball build help [resolved]

[chutracheese]

Hey everyone, I could use some help trouble shooting my speedball build. I've had the Crack built for almost a year. Love it. Works great.
I've completed the first part and the tests aren't correct.

Terminal    Voltage (DC)
OA                71.2V
IA                  185V
B-A/B            0V
IB                  185V
OB                  0V

Any ideas?

 

[chutracheese]

All 4 LEDs are working on circuit board, however, only 1 of the 2 are working for the  12au7 tube.

 

[Paul Birkeland]

None of the solder joints on that PC board have been sufficiently heated.  Be sure you are using solder with lead in it (not silver bearing or lead free solder) and be sure your iron is turned up all the way.

 

[chutracheese]

Very frustrated. No resolution yet.

Could it be a bad tube or socket?
A6 is showing 76V.
A1 is showing 0.
So power isn't getting to U5 from A2.
Unless I am wrong about where power comes from before A2.
I hope that makes sense.

 

[Doc B]

If you might clarify whether you tried PB's suggestion of reheating and reflowing the solder joints on the PC board, he can combine that info with the measurements you just posted and make further suggestions on where to look.

 

[Paul Birkeland]

To add to what Dan mentioned, solder has both the metals in it that you are using to lock everything in place, and it has rosin flux that helps remove oxidation before the solder flows out and cures.  I can tell your solder joints haven't been flowed out because I can see the flux sitting in the joints.  It looks like dark rings around the component leads on the boards.  Flux isn't conductive, so you'll need to apply a proper amount of heat to let the flux bubble out and to get the solder to flow out properly. 
https://www.youtube.com/watch?v=EN16Pi7pcfk

 

[chutracheese]

Good news!
First off, thanks everyone.
I followed your advice.
I desoldered almost everything and then resoldered it all.
I originally used Cardas Audio Quad Eutectic Silver Solder, but really struggled with it.
I bought leaded solder 63/37 and some new tips. So much easier to use.
I just tested everything, and everything is as it should be!

Thanks again for your help and patience.

Now on to the second circuit board.

 

[chutracheese]

Success!

Listening now! Fantastic! Well worth the upgrade!

 

[Paul Birkeland]

Silver solder is indeed a total pain in the butt, I'm glad you got it all sorted out!