T100 Single Ended Stereo Amplifier.

T100 load
line for 5k plate load. Voltage swing is 400Vp that should give 15W rms into
the load.

10kHz square wave response:

Distortion at 12W. ~1% 2nd harmonic, falling pattern.

15-Feb-2010:
T100 with reverse feedback from 16 ohm tapping of output
transformer back to the interstage transformer.
Feedback calculations are similar to cathode feedback.
The T100 grid resistor is reduced to 39R to provide possibilities
to enter class A2.
