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Hoffman Amps Forum image Author Topic: Fender bias balance pot  (Read 3155 times)

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Offline panhead

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Fender bias balance pot
« on: April 29, 2012, 10:15:43 am »
Anybody know where I can get a new 4-lug 10k linear Fender style bias balance pot?
Panhead

Offline Tiny_Daddy

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Re: Fender bias balance pot
« Reply #1 on: April 29, 2012, 10:27:22 am »
Option: Modify the circuit to use two bias pots.

Offline panhead

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Re: Fender bias balance pot
« Reply #2 on: April 29, 2012, 05:08:41 pm »
Thanks, but that's not an option in this case. The guy want's to keep it as original as possible, meaning no extra holes drilled in the chassis. I looked at Doug's bias conversions here, but again, no mods - just repair. I had to argue just to put a grounded power cable and disconnect the ground switch.
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Offline Tiny_Daddy

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Re: Fender bias balance pot
« Reply #3 on: April 29, 2012, 06:07:27 pm »
Then you could swap a pot from another amp after installing Doug's bias conversion in that other amp.

Offline sluckey

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Re: Fender bias balance pot
« Reply #4 on: April 29, 2012, 06:44:26 pm »
Thanks, but that's not an option in this case. The guy want's to keep it as original as possible, meaning no extra holes drilled in the chassis. I looked at Doug's bias conversions here, but again, no mods - just repair. I had to argue just to put a grounded power cable and disconnect the ground switch.
Good luck. I'd hit every amp forum I could and ask if anyone has a used pot to sell.
A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. Don't wait to be asked. JUST DO IT!

Offline birt

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Re: Fender bias balance pot
« Reply #5 on: April 30, 2012, 04:14:13 am »
i think i might have one. if i can find it it will take some time to send it from Belgium...

Offline LooseChange

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Re: Fender bias balance pot
« Reply #6 on: April 30, 2012, 05:02:21 am »
Thanks, but that's not an option in this case. The guy want's to keep it as original as possible, meaning no extra holes drilled in the chassis. I looked at Doug's bias conversions here, but again, no mods - just repair. I had to argue just to put a grounded power cable and disconnect the ground switch.
IMO, the owner is an idiot... I guess he wants the amp to sound crappy too.
These days it's easy to get matched tubes. Change the balance to adjustable...
Tell him it's not a mod it's an improvement.
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