Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: isaac_teller on May 12, 2021, 01:12:19 pm

Title: power TX w/o center tap and tremolo
Post by: isaac_teller on May 12, 2021, 01:12:19 pm

Hello again. I'm building a Blackface Deluxe clone. The power TX doesn't have a center tap(full wave bridge rectifier). I have no problem obtaining the bias voltage from one leg of the AC secondary but how would I implement the tremolo? Thank you.


http://www.prowessamplifiers.com/schematics/fender/deluxe_reverb_ab763_schem.pdf

Title: Re: power TX w/o center tap and tremolo
Post by: pdf64 on May 12, 2021, 01:16:51 pm

What do you perceive to be the sticking point?

Title: Re: power TX w/o center tap and tremolo
Post by: isaac_teller on May 12, 2021, 01:27:40 pm

There's no 50 volt tap. I'm using this bias circuit. Everything works out except the cap connected to the 2M2 resistor


http://www.valvewizard.co.uk/cap_coupled_bias_supply2.jpg (http://www.valvewizard.co.uk/cap_coupled_bias_supply2.jpg)

Title: Re: power TX w/o center tap and tremolo
Post by: pdf64 on May 12, 2021, 02:05:11 pm

Take that feed from the raw bias supply, the -ve end of C2.

Title: Re: power TX w/o center tap and tremolo
Post by: isaac_teller on May 12, 2021, 02:21:20 pm

Thank you very much