Tube Question

roycruz23 said:
Hi! Can I substitute/use 6FY7 or 6FM7 for 6FJ7?

Thank you,
Roy
The 6FY7 can't handle the voltage or the plate dissipation. The 6FM7 would need to change the operating points (voltages and currents) - in other words, re-design the circuit.
 
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