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In Reply to: RE: I know what to look at posted by Triode_Kingdom on November 30, 2015 at 00:53:19
Update...
I took a look at my tube models compared to the tube curves and neither were very close so I used curve captor to create more accurate models. Now I do get the SN7 being more linear. Where i was getting about 1% for each with the old models I now get .022% for the SN7 and 1.5% for the BL7 at the same conditions. Reducing the drive by a factor of 10 (+-6V out) gives .15% for the BL and .0012% for the SN7.
Here are the FFT's of the two signal levels.
It seems possible that the BL7 is adding some of that yummy SE distortion that PP amps quash.
dave
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"Still Working the Problem"
A friend of mine has basically DIY amp as the one listed here in this thread. After hearing about the success with my amp, he changed his driver tubes from 12SN7 to 6BL7, and reported the same results. He is very happy with the results. He especially noticed a big improvement with low level playback. He also noted that it seems to have less distortion, cleaner midrange and treble.
"What this country needs is a good 5 watt amplifier!" (Paul Klipsch)
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