1. Paramour: Top Level Link.
             10% Distortion Tables vs Frequency. Output impedance vs Frequency.

2. Paramour: Stock Output Transformer, Stock  Choke, AVVT 2A3 M tubes,
             Right Amp, 10% distortion pictures, No distortion curves.
             These links open new windows so you can compare them together.

3. Paramour: Stock Output Transformer, EXO-04 Choke, AVVT 2A3 M tubes,
             Right Amp, 10% distortion pictures, distortion curves.

4. Paramour: Stock Output Transformer, Stock  Choke, Sino 2A3 tubes,
             Left Amp,  10% distortion pictures, distortion curves and pictures.

5. Paramour: Stock Output Transformer, Stock  Choke, AVVT 2A3 tubes,
             Left Amp,  10% distortion pictures, distortion curves.

6. Paramour: EXO-45-VS Output Transformer, Stock  Choke, AVVT 2A3 tubes,
             Left Amp,  10% distortion pictures, distortion curves,
             50Hz 100 Hz distortion curve comparison.

7. Paramour: EXO-45-VS Output Transformer, EXO-04 Choke, AVVT 2A3 tubes
             Right Amp, 10% distortion pictures, distortion curves.

Note: Sino tube shown

This is the left channel with the stock Paramour magnetics with an AVVT 2A3 at 10 kHz, 10 usec/ div, 10% distortion. (6.1 V rms)

The top is distorted because the choke can only supply the "idle bias" current into the output transformer.
The bottom is not as distorted because the tube can actively pull down. The tube is pulling down the "load current" and the "bias current" stored in the parafeed choke.

This is the left channel with the stock Paramour magnetics with an AVVT 2A3 at 1 kHz, 100 usec/ div, 10% distortion. (6.10 V rms)

This is the left channel with the stock Paramour magnetics with an AVVT 2A3 at 100 Hz, 1 msec/ div, 10% distortion. (5.13 V rms)

This is the left channel with the stock Paramour magnetics with an AVVT 2A3 at 50 Hz, 2 msec/ div, 10% distortion. (3.81 V rms)

This is the left channel with the stock Paramour magnetics with an AVVT 2A3 at 20 Hz, 5 msec/ div, 10% distortion. (1.40 V rms)

Notes for Chart 3:
1. I took these distortion measurements with a Heathkit Sinewave generator that was sending 1.0 % distortion at 100 Hz and 1.5 % distortion at 50 Hz to the Paramour before the Paramour added any distortion of its own.
2. I could manually null the HP334A I was using better than the autonull would work.

Chart 3: Left Paramour with stock iron: Distortion vs Output Power into 8.45 ohms on 8 ohm tap with AVVT 2A3 output tube. (Left Amplifier)