Second Opinion on Voltage Tests

[Dukaz112]

Hello everyone!

I did the final touches on my C2A and passed the resistance checks; however, I wanted to run by my voltage checks with y'all. Most of the voltages are in spec but a few are a little off.

Spec (Actual)

Low Current C4S

IA: 150V (150V)
OA: 60-90V (58.6V)
KregA: 3-6V (4.85V)
bRegA: 150V (150V)

IB: 150V (150V)
OB: 60-90V (70.7)
KregB: 3-6V (4.86V)
bRegB: 150V (150V)

High Current C4S (B socket)

IA: 190V (194.6V)
OA: 150V (150V)
bA: 0V (0V)

IB: 0V (0V)
OB: 90-110V (82.8V)
bB: 150V (150V)

High Current C4s (D socket)

IA: 190V (194.6V)
OA: 150V (150V)
bA: 0V (0V)

IB: 0V (0V)
OB: 90-110V (92.3V)
bB: 150V (150V)

Headphone Jack

Tip: 0V (.07V)
Ring: 0V (.06V)

Are these lowish voltages at the low current C4S OA and B sockets OB any cause for concern? All the LED's light up as well. Apologies if this post is silly, I just want to be positive that I didn't make a mistake with my soldering or assembly.

Thanks,

 

[Paul Birkeland]

Low Current C4S
OA: 60-90V (58.6V)

When we see that voltage dip below 60, you'd want to be sure that Q1A is not installed backwards, as this will cause the corresponding output voltage to be a bit lower than you'd expect. If you inspect the PN2907 transistors on the center C4S board and they are both properly installed, then you don't need to worry about this.

 

[Dukaz112]

I will have to double check the orientation, thanks Paul!