Incorrect voltages for stock Crack

hiace91 · 560

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Offline hiace91

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on: February 11, 2020, 08:47:43 PM
Hi,

I've finished my crack build and passed the resistance checks but the voltages are off. I'm in Australia so I'm working with 240v and here is what I'm getting:

1 150
2 165
3 0
4 165
5 75

6 0
7 147
8 0
9 97
10 0

Both tubes are glowing and seem to be fine. Does anybody have any recommendations?

Cheers,

Jamie.


Offline Tom-s

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Reply #1 on: February 11, 2020, 09:02:09 PM
Are LED's on?

To explain. I'm answering this as i think USA has gone to bed.

One half of your 12AU7 isn't conducting. So probably a loose connection on the small tube socket.
Double check LED orientation and for bad connections, resolder all that look suspicious.
« Last Edit: February 11, 2020, 09:10:12 PM by Tom-s »


Offline Paul Birkeland

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Reply #2 on: February 12, 2020, 04:26:50 AM
Post photos of your build if possible. 

Either the solder joint at A4/A5 isn't sound, an LED is damaged, or there's some other loose connection that's less common.  Do both halves of the 12AU7 light up?  can you carefully measure the DC voltage at A3 and A8?

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

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