If you use the "original" circuit as a reference and the cathode resistor is bypassed with a cap, then the input sensitivity of the amp will be approximately 1VRMS for 3.5 Watts out at 5% THD+N.
Many factors come into play here, but that is a good estimate based on a few 2A3 amps I have built using a 6SL7 tube as a driver.
Many factors come into play here, but that is a good estimate based on a few 2A3 amps I have built using a 6SL7 tube as a driver.
It is difficult to address your question without a schematic, and I am not attempting to disagree with TDH+N; but, in my estimation, it is difficult to obtain much more than 3 Watts out of a 2A3 into a reasonable OPT impedance...especially in your typical Loftin-White circuit.
Assuming a plate load equal to 200% of the 6SL7's R(p), and a fully bypassed R(k), I'm guesstimating that 1.3 vac input will give you approx 3 Watts into a 3k5 load.
Assuming a plate load equal to 200% of the 6SL7's R(p), and a fully bypassed R(k), I'm guesstimating that 1.3 vac input will give you approx 3 Watts into a 3k5 load.
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