HI, GOt a 68 SUper Reverb with a tubechar that said AB763 but circuit is actually AB568.
Had the bias supply converted to match AB763 spec ( and Cathode bias removed ) except THe tech left the 70@80 cap there when the AB763 calls for a 25@50
WHat impact , if any can this have ?
1968 Super Reverb bias supply question
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Stevem
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Re: 1968 Super Reverb bias supply question
No problem. The only main difference will be that the bigger UF filter will take a few microseconds longer to charge up.
Also if the amp is played loud enough to start to sag the power supply voltage then the bigger UF filter will keep the bias voltage more stable.
Also if the amp is played loud enough to start to sag the power supply voltage then the bigger UF filter will keep the bias voltage more stable.
When I die, I want to go like my Grandfather did, peacefully in his sleep.
Not screaming like the passengers in his car!
Cutting out a man's tongue does not mean he’s a liar, but it does show that you fear the truth he might speak about you!
Not screaming like the passengers in his car!
Cutting out a man's tongue does not mean he’s a liar, but it does show that you fear the truth he might speak about you!
Re: 1968 Super Reverb bias supply question
Does this mean Less Sag ?Stevem wrote: ↑Tue Jan 23, 2024 11:23 am No problem. The only main difference will be that the bigger UF filter will take a few microseconds longer to charge up.
Also if the amp is played loud enough to start to sag the power supply voltage then the bigger UF filter will keep the bias voltage more stable.
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Stevem
- Posts: 4576
- Joined: Fri Jan 24, 2014 3:01 pm
- Location: 1/3rd the way out one of the arms of the Milkyway.
Re: 1968 Super Reverb bias supply question
No.
The bias supply is not powering the tubes.
The bias supply is not powering the tubes.
When I die, I want to go like my Grandfather did, peacefully in his sleep.
Not screaming like the passengers in his car!
Cutting out a man's tongue does not mean he’s a liar, but it does show that you fear the truth he might speak about you!
Not screaming like the passengers in his car!
Cutting out a man's tongue does not mean he’s a liar, but it does show that you fear the truth he might speak about you!