FDP Home Page / FDP Forum / FAQ's
The bright cap, the feedback loop resistor and one of the voltage divider resistors that determine the bias point, next to V2 and V3 (phase inverter). They are GT 12AX7M (Mullard clones). Not shown, JAN Phillips 5751 for V1 and JJ EL84's for power section.
I strongly recommend 5751 or 12AY7 for V1.