Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Toffe007 on September 25, 2019, 09:24:37 am

Title: Help needed - No sound Blues Junior conversion.
Post by: Toffe007 on September 25, 2019, 09:24:37 am

So i´ve double checked the wiring, meassured the the powersection, biased to 25mV but still no sound . How to advance? Only thing i found is that filement is changed for el84 V4 and V5. Pin 4 and 5 is wired reversed. But  this is the case in all hoffman building pictures but not in schematics.

Title: Re: Help needed - No sound Blues Junior conversion.
Post by: PRR on September 25, 2019, 11:20:07 pm

Heater "polarity" does NOT matter, any more than to a 2-pin-plug room-heater.

What is "no sound"? A small hiss? Hum? Or genuinely NO sound? Even when you bump the tubes? NO sound on a tube amp is often the speaker connector mis-wired.