[Big Bad Bob]

On 08/28/17 06:20, wrote:
The schematic is at http://www.vintage-radio.info/heathkit/index.htm

bookmarked, thanks.

looked at schematic. It looks like a newer (more powerful) design of an
old Heathkit amp I used to have (until output transformer fried a
winding, made one output tube's plate go pink) that was 25W. I see they
were still powering the pre-amp off of the power amp's power supply.
THAT setup, which unfortunately went to a dump in the 80's [not entirely
my fault, I wish I could've kept it all, but I was in the Navy so...]
had a 25W amplifier from around 1955, a pre-amp with phono input (etc.),
an AM radio, and an FM radio [all monophonic Hi Fi]. The circuitry was
"classic" with tube diodes in the FM receiver on the ratio detector. I
think there may have been a solid state diode in the AM receiver,
though, or maybe they used one of those triode/diode combos where
everything has a common cathode. Whatever it was, it was one of the
BEST AM receivers I've ever seen. It used a peaking coil to squeeze out
the high frequency bandwidth close to 10khz, which made it sound pretty
good for AM music [which still played a lot back then].


As for "actual power" vs "music power" or whatever OTHER lame spec
"they" used to advertise in the 70's, it looks like genuine 55WRMS to
me, just from the schematic. And yeah, 6L6's wouldn't work...