Bare Knuckle Pickups Forum

Forum Ringside => Tech => Topic started by: TomW on July 14, 2007, 09:47:36 AM

Title: Changing Tubes
Post by: TomW on July 14, 2007, 09:47:36 AM

The power tubes in my Marshall DSL100 need changing and I was just wondering if my amp needs rebiasing if I replace the tubes with the same type of tube but a different brand.

Title: Changing Tubes
Post by: jordan on July 14, 2007, 01:20:27 PM

Yes.

Power-amp tubes should always be re-biased, even if replacing them with the same brand. This is because tubes all have different ratings, and your amp will be (or should have been) biased for a particular valve rating.

Pre-amp tubes, however, can be changed without the need to rebias.

Title: Changing Tubes
Post by: TomW on July 14, 2007, 02:19:38 PM

Thanks for the reply.
Does anyone know of a good shop in Leeds where they will replace the valves and rebias my amp? What is the average cost?