I'm repairing a 2475-130 with a 12AX7 as PI. Caps weak, some R drifted away, all changed yet.
May be the OT is faulty, and I 'm looking for a replacement OT. The only type I found is a TAD for the 2485-130 with a Raa of 4.7k (4x EL34 at 702V plate) and a TAD for the 2475-150 with a Raa of 2,8k.
Does anybody know the Raa of the original OT? At the moment is built in a Welter OT with 5k Raa. Raa 4,7k is a reliyable value?
Thanks and bye