Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: joesatch on April 13, 2025, 06:25:44 pm

Title: PT Tap question
Post by: joesatch on April 13, 2025, 06:25:44 pm

PT will power 2 x 5881 tubes and 40 watt OT.  this 25V tap @75ma, what can it be used for? Not enough for a bias supply? Not enough to rectify for 12vdc for  V1 filament?

Title: Re: PT Tap question
Post by: tubeswell on April 13, 2025, 08:46:37 pm

25VAC will rectify to 35VDC which could be okay for 6V6s depending on the B+ voltage, but it’s no problem to squeeze more out of it if you use a voltage doubler. 75mA is plenty for a bias supply.