Driver Testing: 32U and 46U voltage issues

dehringer · 3993

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Offline dehringer

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on: September 09, 2022, 03:02:10 PM
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!



Offline dehringer

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Reply #1 on: September 09, 2022, 03:03:00 PM
Additional pictures of the other side.



Offline Paul Birkeland

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Reply #2 on: September 09, 2022, 03:33:27 PM
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.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline dehringer

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Reply #3 on: September 09, 2022, 06:03:10 PM
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!