High T9 voltage, 1 LED doesn't light up

afilen · 1686

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Offline afilen

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Reply #15 on: June 23, 2021, 01:47:31 PM
Trimmed 3U and resoldered, resoldered A9. I also switched the 12AU7 tube to a new one from Amazon and now I only have a very faint hum in the left channel. Connected my DAC via RCA and am able to get sound in the left channel, but even after turning the volume to near max on the Crack, the music is far too quiet. New pics added
« Last Edit: June 23, 2021, 02:09:55 PM by afilen »



Offline afilen

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Reply #16 on: June 23, 2021, 02:23:53 PM
Checked my voltages again and they are in the 170V range once again, so I’ll have to see if there’s any crossed wires



Offline Paul Birkeland

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Reply #17 on: June 23, 2021, 04:09:47 PM
Checked my voltages again and they are in the 170V range once again, so I’ll have to see if there’s any crossed wires
Which voltages are 170V?  That would be appropriate for T2, T4, B2, and B5.

Where the black wires on the headphone jack meet doesn't look well captured by soldered.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline afilen

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Reply #18 on: June 23, 2021, 04:30:31 PM
Cleaned off and resoldered where the 2 black wires meet on the headphone jack. No hum/buzz anymore. Connecting it to my DAC, I hear no sound unless I turn up the volume pot to the max - and even then, it is barely audible through the headphones. Currently testing with ZMF Auteurs



Offline Paul Birkeland

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Reply #19 on: June 23, 2021, 04:32:55 PM
Cleaned off and resoldered where the 2 black wires meet on the headphone jack. No hum/buzz anymore.
How are the voltages?

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man