Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: fossilshark on October 07, 2016, 08:38:19 pm

Title: Output Transformer impedance for 6v6gt push pull
Post by: fossilshark on October 07, 2016, 08:38:19 pm

If i am correct, in a push pull amplifier you connect the two plates to the 8k primary and the center tap goes to b+. I need to know the impedance of the line you connect to the grids (or screens, pin 4) of the 6v6s. If im to vague i can send a picture of my schematic.

Title: Re: Output Transformer impedance for 6v6gt push pull
Post by: PRR on October 07, 2016, 08:57:01 pm

Basic connection is screens to B+, sometimes a drop-filtered B+ from the main B+.

UltraLinear connects screens to taps on the OT windings. While there must be an impedance around here, we usually just specify the winding ratio percent.

If you found some other plan, better show it.

Title: Re: Output Transformer impedance for 6v6gt push pull
Post by: sluckey on October 07, 2016, 10:19:54 pm

Fender used a 470Ω/1W resistor in the blackface push/pull 6V6 amps. He connected screens directly to B+ in the earlier tweed and brown amps.