12AX7 and ECC83 are virtually the same, although in theory a real ECC83 will always have a low noise spiral-wound heater; a 12AX7 might not, although many actually do.
6n2p is a similar Russian valve, but with different heater arrangements. To use it in a 12AX7/ECC83 circuit you need to rewire the heaters.
6n2p is a similar Russian valve, but with different heater arrangements. To use it in a 12AX7/ECC83 circuit you need to rewire the heaters.
ECC83/12AX7
1 = A 2 = G 3 = K 4 = Htr 6.3V 5 = Htr 6.3V 6 = A 7 = G 8 = K 9 = Htr Centre tap 0V
6N2P
1 = A 2 = G 3 = K 4 = Htr 5 = Htr 6 = A 7 = G 8 = K 9 = Scrn
The Hfe and noise figures are similar to ECC803, better than ECC83
The heater of 12.6 vbolts across 4 & 5 with a centre tap at pin 9 is the difference. Rewiring of the valve base will be required.
1 = A 2 = G 3 = K 4 = Htr 6.3V 5 = Htr 6.3V 6 = A 7 = G 8 = K 9 = Htr Centre tap 0V
6N2P
1 = A 2 = G 3 = K 4 = Htr 5 = Htr 6 = A 7 = G 8 = K 9 = Scrn
The Hfe and noise figures are similar to ECC803, better than ECC83
The heater of 12.6 vbolts across 4 & 5 with a centre tap at pin 9 is the difference. Rewiring of the valve base will be required.
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