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RH84 type test amp: THD & THD+N @ 1 to 3 watts ...

I made a simple passive preamp with a 100K 2W AB pot to make fine tuning the output signal possible while testing.

Test signal was 1KHz sine.

At 1W: Left Channel THD = .63% THD + N = .66%
At 1W: Right Channel THD = .66% THD + N = .69%

At 2W: Left Channel THD = 1.16% THD + N = 1.16%
At 2W: Right Channel THD = 1.12% THD + N = 1.12%

At 3W: Left Channel THD = 1.74% THD + N = 1.74%
At 3W: Right Channel THD = 1.58% THD + N = 1.58%

At the 3W power level, the left channel 3rd harmonic was 3dB above the 2nd harmonic. The right channel 3rd harmonic was about 1 dB above the 2nd harmonic.

I have another SE amp that uses global feedback, so I will test it to see if the 3rd harmonic is that pronounced as in this circuit.


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Topic - RH84 type test amp: THD & THD+N @ 1 to 3 watts ... - deathtube 667 17:39:06 09/28/16 (12)
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