Bias pot in Ampeg V-4B [Archive]

View Full Version : Bias pot in Ampeg V-4B

Majin GeoDooD

01-10-2007, 12:57 PM

How simple/complicated is it to install a bias pot in an Ampeg V-4B?

I've owned one for close to a year and just measured the bias with a probe a few days ago - 15mA! I'm running JJ 6L6s in it. It should definitely be around 35 mA.

How much would a good tech charge for such a prodecure?

Majin GeoDooD

01-11-2007, 07:41 AM

Bump

Majin GeoDooD

01-12-2007, 09:27 PM

Does anybody know?

Dave C

01-12-2007, 10:21 PM

It's not that difficult a job. It would involve removing a resister and replacing it with another resister and a trim pot ....a couple dollars in parts and whatever the techs bench time is worth. I'd guess $50 or so depending on time and degree of difficulty.
Dave C

Majin GeoDooD

01-12-2007, 10:27 PM

Sounds good to me. Thanks for the help!