Wednesday, January 26, 2011

Better Highs with Better Bias

One of the ideas in last post was to re-bias Acurus A250 amplifier which currently drives supertweeters.  Here's a discussion on exactly this sort of thing with a virtually identical Acurus A200, where it is claimed by several posters that increased bias removes the steely highs of this amplifier:

Increasing bias to 6-7mA (measured across 0.5 ohm emitter resistors) is said to improve highs immensely.

It's not entirely clear to me if the R11 potentiometer is the bias adjustment; that's the only potentiometer I see on the schematic.  Is there no offset adjustment then?

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