Originally Posted by southall-1998_mk2
Tentative rough specifications of this new design, subject to changes as things are tweaked / refined:
Bandwidth 10Hz - 50Khz (100Khz -6dB approx)
THD into 8R / 1Khz:
Just over 1W: 0.004% (Almost entirely just 2nd and 3rd harmonic)
Approx 10W: 0.008% (Almost entirely just 2nd and 3rd harmonic)
Approx 25W: 0.012%
Full power: 0.025% (amount of power slightly curtailed in prototype due to unregulated screen supply dropping significantly)
Yes, this is with a valve output stage, and this is actually significantly better than many solid state amplifiers, even currently sold ones, especially in terms of harmonic spectrum at low levels.
Output impedance approximately 0.3 ohms, substantially resistive even until top of audio band (not directly measured as of yet)
Minimal peaking / ringing into capacitive loads, unconditional stability
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