Since the 12ax7 are getting more expensive, i'm looking at the 6n2p tubes as alternatives maybe. But the pinout is different. I found this picture. Am i right in thinking that for the D-la2a i'd have to:
- cut the trace between pin 4 and 5
- rewire the heaters to pin 4 and 5, and connect pin 4 with the other tubes' pin 4, and pin 5 with the other pin 5 and pin 9 of the 12bh7 and 6AQ5
- rewire 9 to ground
I'm not sure of the last step, is it necessary? And where can i easily connect to ground? I was thinking maybe at the ground pins from c171/172/173/174, because those are closeby. Any advice?