• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

output transformer spec for 6SN7 Cathode Follower

Both sections of a 6SN7 in parallel cut the OPT inductance requirements in half. Subing in a 6BL7 would further reduce the inductance further.🙂
The preamp could be isolated from the main amp by cutting the connexion between the preamp common & the main amp common, thus avoiding a ground loop.Done all the time in broadcast work.

So shall I make the two triodes work in parallel as mostly I use pin4 for input and now to add 1 as well. Do I need to connect both cathode, anode and grids and the connect the cathode resistor and capacitor and the trafo to anode?