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.
           This link opens a new window so you can compare it to other pages.

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.

Not only can you see the EXO-45-VS, but you can see the AVVT 2A3M this time.

This is the left channel with the EXO-45-VS Output Transformer, stock plate choke with an AVVT 2A3 at 10 kHz, 10 usec/ div, 10% distortion. (6.4 V rms)

This is the left channel with the EXO-45-VS Output Transformer, stock plate choke with an AVVT 2A3 at 1 kHz, 100 usec/ div, 10% distortion. (6.46 V rms)

This is the left channel with the EXO-45-VS Output Transformer, stock plate choke with an AVVT 2A3 at 100 Hz, 1 msec/ div, 10% distortion. (5.79 V rms)

This is the left channel with the EXO-45-VS Output Transformer, stock plate choke with an AVVT 2A3 at 50 Hz, 2 msec/ div, 10% distortion. (4.54 V rms)

This is the left channel with the EXO-45-VS Output Transformer, stock plate choke with an AVVT 2A3 at 20 Hz, 5 msec/ div, 10% distortion. (1.77 V rms)
Notice how clean this 10% looks. It is all lower order distortion (no fast wiggles).

This is the left channel with the EXO-45-VS Output Transformer, stock plate choke with an AVVT 2A3, low level 20 Hz square wave, 5 msec/ div. No nasties are visible. The decay is clean.

Notes for Chart 4:
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 4: Left Paramour with EXO-45-VS output transformer, stock plate choke:
Distortion vs Output Voltage into 8.45 ohms on 8 ohm tap with AVVT 2A3 output tube. (Left Amplifier)

I installed a new output pot in my IG-5282 sine generator so I could repeat the test voltages more exactly. I also noticed that the 9V batteries were dropping in voltage when they were loaded (the power turned on) so I put in new 9V batteries. With the new 9V batteries and new output pot, the 50 Hz and 100 Hz residual distortion dropped to 0.28%.

To make the measurements depend even more on the output iron, I used the same 12AT7 and AVVT 2A3 in both amplifiers while I was taking the measurements. The hum would adjusted down to be 4.4 to 4.6 mV in both amplifiers. The EXO-45-VS had about 6 CDs worth of burn-in for these measurements. The EXO-04 had many more hours of burn-in. Also, these measurements were taken in the same evening on a counter top instead of on the floor. All the previous tests were done with the amps on a tile floor.

At 50 Hz, I got more power out by upgrading the plate choke. At 100 Hz, I got more power out by upgrading the output transformer. The upgraded transformer had lower distortion at 100 Hz too.

A tid-bit of information: At 100 Hz, it took 0.82V input with the EXO-45-VS output transformer to get 5.00V across the 8.45 ohm load resistor on the 8 ohm output tap.