Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Wanabejimi on October 06, 2020, 02:45:45 pm

Title: Stupid Tranformer Question
Post by: Wanabejimi on October 06, 2020, 02:45:45 pm

Why does this PT diagram say "red/yellow (CT) to red/blue (bias tap)"?

Title: Re: Stupid Tranformer Question
Post by: shooter on October 06, 2020, 02:58:59 pm

dark stabbing;
if you don't want a Ct OR a bias tap, jump CT to bias tap  :dontknow:


EDIT  :BangHead:


don't jumper, ignore me an them and do it correctly

Title: Re: Stupid Tranformer Question
Post by: bmccowan on October 06, 2020, 03:13:30 pm

There are no stupid questions. There are stupid answers and not wanting to risk giving one, I'll only add that I was curious and neither Heyboer or Classic Tone transformers for the same amps have that instructional note. Seems like some weird mistake to me.

Title: Re: Stupid Tranformer Question
Post by: bnwitt on October 06, 2020, 03:49:26 pm

It says that 50V is available between the center tap (CT) wire of your transformer secondary which is Red with a yellow stripe and the red with a blue stripe wire.  If you don't need a bias voltage, (cathode biased amp) then nut off the red with blue stripe wire. 

Title: Re: Stupid Tranformer Question
Post by: Wanabejimi on October 06, 2020, 04:02:07 pm

Thanks All!