Dr. Z 6545 Presence Control

[benttop]

I would like to add some means of dialing in some presence on this amp. Before I spend a pile of time reverse engineering the schematic, has anyone already done such? Any advice about the best way to go about adding a presence control to this amp? Any help is appreciated.

[jaydawg]

as far as I know, the presence control is a variable feedback look. So just add a NFB and use a pot in place of the resistor.

[benttop]

as far as I know, the presence control is a variable feedback look. So just add a NFB and use a pot in place of the resistor.

I'll have a look at that. Not sure if there is NFB already on that amp or not (probably is). A good place to try some experiments I suppose - still have to reverse engineer the schematic from the chassis...