At your risk.
A n octal base 1:5 Sowter microphone input transformer, and an octal base 7:1 Sowter microphone transformer used as output transformer are currently plugged in
With driving impedance of about 200 ohms and load terminating impedance of 10 Kohms.
Frequency response is flat at least from 15Hz (+1dB) to 78KHz (-3dB).
When connecting Sennheiser HD580 headphones across the output and listening while playing with the sinewave signal generator frequency and amplitude: As input signal is increased it can be clearly heard by ear that 2nd harmonic (octave) gradually gets into play, then including 3rd, 4th etc all too gradually happening indicating soft (analog) clipping.
Output impedance is about 400 ohms.
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