No sound coming from the left, lots of static from the right [resolved]

CrackNoob · 1089

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Offline CrackNoob

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on: February 19, 2022, 06:47:03 AM
Hello fellow Cracks,

I'm getting no sound coming from the left and lots of static coming from the right. I checked the LEDS, D2 on the large board is not lighting up and the LED on the crack A8. I tried reflowing all the joints to the small tube sockets and the connections for the speedball boards to the crack unit. Here are my result from voltage test:

Large Board:
OA - 194
OB - 72
G- 0
B -204

Small Board:

OA - 4.1
OB-77

Hope you guys can help.
« Last Edit: February 20, 2022, 06:46:32 AM by Paul Birkeland »


Offline Paul Birkeland

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Reply #1 on: February 19, 2022, 06:55:05 AM
Can you post some build photos? 

Were the voltages OK when you installed the small board?

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline CrackNoob

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Reply #2 on: February 19, 2022, 07:52:28 AM
My built was operational prior to not being used for a good year. So yes the voltage was good when I had it working.


Offline Paul Birkeland

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Reply #3 on: February 19, 2022, 07:54:01 AM
If the amp was operational and now is not, this would tend to suggest there's a flaky solder joint or loose connection making its presence known.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline CrackNoob

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Reply #4 on: February 19, 2022, 08:31:22 AM
Is it possible one of the transistor is blown? I checked all the joints, and everything looks pretty solid.


Offline Paul Birkeland

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Reply #5 on: February 19, 2022, 09:04:05 AM
Why would a transistor be blown? 

Is the keyway still present in the base of your 6080 tube?

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline CrackNoob

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Reply #6 on: February 20, 2022, 06:35:54 AM
I went through all the wires again, even though all of joints were solid, I found one red wire that was about to break off, I'm assuming during the stripping process i went a little to hard on it. I replaced it and solder, everything works great now. Thanks!


Offline CrackNoob

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Reply #7 on: February 20, 2022, 06:58:41 AM
I think I spoke too soon, maybe I had the input jack half way in which gave me both sounds on the left and right. But now when I plug in the jack all the way in it doesnt give me sound on the left side. The static went away though. One problem after another.
« Last Edit: February 20, 2022, 07:03:49 AM by CrackNoob »


Offline Paul Birkeland

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Reply #8 on: February 20, 2022, 11:02:56 AM
I would recheck your voltages and post back any that aren't correct.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline CrackNoob

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Reply #9 on: February 20, 2022, 12:47:52 PM
Voltage seems to be close to the recommended range after fixing the red wire going to the power.

Large Board:
OA - 140
OB - 120
G- 0
B - 202

Small Board:

OA - 80
OB- 80
« Last Edit: February 20, 2022, 12:53:20 PM by CrackNoob »


Offline Paul Birkeland

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Reply #10 on: February 20, 2022, 02:18:21 PM
I would post some build photos, it's possible that there's something we can spot.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

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