On 19 mayo, 00:24, Franc Zabkar wrote:
On Tue, 18 May 2010 15:04:03 -0700 (PDT), b
put finger to keyboard and composed:

It uses an STK 4152 II, pretty typical design of the period.

FWIW, there is application circuit in the datasheet:http://www.datasheetarchive.com/pdf-...DF/STK4152.PDF

took a look at that, thanks. Unfortunately there is nothing connected
to the mute pin (6) on this amp, so that ruled out a relatively easy
line to pursue.
I've changed most of the caps around the subcircuits of the IC to no
avail. It's looking as if the IC is shot, and it seesm to be NLA.....
-B