Driver Testing: 32U and 46U voltage issues

[dehringer]

Hi,

I’m working my way through my Kaiju build and am running into issues with the voltages on 32U and 46U.

On the A socket board:

• IA: 506v
• OA: 302v
• 32u: 3.9mv

On the B socket board:

• IA: 506v
• OA: 307v
• 32u: 16.3mv

Turning neither pot changes 32U/46U significantly.

I did noticed that it looks like neither LED in D2 on the B sides of the boards is lit.

I tried reflowing everything on the two boards, which made no difference. Can you recommend next steps for troubleshooting?

Thank you for you help!

 

[dehringer]

Additional pictures of the other side.

 

[Paul Birkeland]

All your 431 regulators are installed backwards.  You have also left off a resistor on each board.

The resistor going to pin 3 on one of your 4 pin sockets appears to be very close to pin 4.  Keep in mind that if they touch, you will likely damage the 300B tube plugged into that socket.

 

[dehringer]

Well that was one of the more inconvenient mistakes I’ve made.  I fixed one side and it is looking good.  But I managed to damage a regulator when attempting to unsolder it.  So I’m going to need to order a new one.

Thanks for the call out on the resistor near on the 4-pin socket.  I’ve given it some more room so there isn’t a chance of it touching pin 4.

Thanks for the quick response Paul!