Procrastination is our worst enemy.🙂
i know, i have over ten projects in various stages of completion, money is tight.....
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?