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the label bias is a negative voltage

@Paul
Yes the label "bias" in this schematic is a negative voltage even though I have miss to wright it down.

The LL1664 is configured as a 3000:8 ohm load.

The amp sounds fine, no question about that. But that does´nt mean it could not be make sounding even better.
My curiosity was pointing at the input and the E280F driver, with the aim of increase sensitivity and decrease the source load.

Is it adviceable to try the driver as a pentode to lower the miller cap?
Change the 25K volume control for a 100K dito?
Increase (or remove) the grid leak resistor?





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  • the label bias is a negative voltage - pix 23:28:29 04/03/17 (0)

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