Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: panhead on April 29, 2012, 10:15:43 am

Title: Fender bias balance pot
Post by: panhead 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?

Title: Re: Fender bias balance pot
Post by: Tiny_Daddy on April 29, 2012, 10:27:22 am

Option: Modify the circuit to use two bias pots.

Title: Re: Fender bias balance pot
Post by: panhead 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.

Title: Re: Fender bias balance pot
Post by: Tiny_Daddy 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.

Title: Re: Fender bias balance pot
Post by: sluckey on April 29, 2012, 06:44:26 pm

Quote from: panhead 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.

Good luck. I'd hit every amp forum I could and ask if anyone has a used pot to sell.

Title: Re: Fender bias balance pot
Post by: birt 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...

Title: Re: Fender bias balance pot
Post by: LooseChange on April 30, 2012, 05:02:21 am

Quote from: panhead 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.

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.