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Hoffman Amps Forum image Author Topic: 5B6 build... no output  (Read 7345 times)

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Offline zephyrblau

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  • Posts: 40
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Re: 5B6 build... no output
« Reply #50 on: October 10, 2023, 05:59:35 pm »
found another missing wire and installed it. verified all wiring.
voltages now read as follows:
1) 400 [407]
2) 320 [339]
3) 300 [315]
4) 160 [100]
5) 180 [100]
6) 390 [401]
7) 180 [97]
8) 320 [339]
9) 390 [404]

oscillation is still an issue. chop sticking produces no change. dropping the 6SC7GT produces no change.
drop the Russkie 6SL7 and the amp is dead quiet.
I'm a paint by numbers guy who knows how to solder but little else.

Offline sluckey

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Re: 5B6 build... no output
« Reply #51 on: October 10, 2023, 06:52:48 pm »
Keep looking. I suspect at least one more wiring error.
A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. Don't wait to be asked. JUST DO IT!

Offline zephyrblau

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  • Posts: 40
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Re: 5B6 build... no output
« Reply #52 on: October 12, 2023, 07:05:56 pm »
changed out the Russkie 6SL7 (actually 6SN7) to a 5691 and all is well. again my thanks to all for the help.
I'm a paint by numbers guy who knows how to solder but little else.

 


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