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RE: word of caution ...

Posted by deathtube 667 on September 17, 2016 at 14:13:51

In Reply to: RE: Have you tried the RH circuit with octal driver tubes? posted by DAK on September 17, 2016 at 13:27:59:

I have not tried separate R droppers + cap for the driver stage or measured to see if that would lower THD in the driver stage or at the output, but it would be an interesting experiment.

All I did was connect a separate wire to each plate resistor from a common B+ node vs. one wire from a B+ node to plate resistors that were jumpered together.

Not sure how that really isolated each channel anymore than they already were before I changed the wirings.

Maybe some low noise zener diodes from the B+ node to the driver plate resistors would provide better channel separation, but I have not tried that or know how it measures or sounds.

The report of lowered THD might have been the effect of variations in AC line voltage as opposed to the wiring changes.

Nor have I tried the octal drivers with EL84 finals.

I need to get everything back on a breadboard so I can try more things easier.

Thanks for commenting.

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