RAUNISTULA - Current feedback amplifier
Oldie, but goldie. Made this one during 1992-193. I took schematics for this amp from old PMI's databook. It's Mark Alexanders Current feedback amplifier.
Only thing witch is changed is output devices, and they are Hitachi 2SK155 / 2SJ50 pair. (Original pair was har to get in Finland) Nice amp, but I accedently fried this
by connecting the diodebridge output in reverse polarity. Lucilly the caps didn't blow and only damage were in one channel, were
the quiesent current is now way too big. I have plans to recover this amp some day.
Raunistula amp. Based on Alexanders current feedback amp.
From left to right: Main power switch, IEC Mains connecor, Diagnostics connector, Speaker outs and line inputs
From top to bottom: Amp Modules with Hitachi 2SK135 / 2SJ50 Power MOSFETS and PMI Op Amp inpustage.
Center right: Power supply for auxillary systems, In the middle Main power supply.
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