"Can anyone point me to a summary of Pilot tube amps?"
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I second that! That's exactly what I was looking for when
I wandered through here and all the associated links. (I will keep
looking though.)
I just acquired a "Model 500", which I was sure was pretty
much an SA-232 on a different shape chassis. Having never
seen but photos of the '232, I was guessing the iron all looked
similar. Once I got it in, I saw the 500 has the 12AX7's, EL84's,
and GZ34, but no 12AU7, so now I see I misjudged. It might be
a fine amp anyway, but just different. 5 caps underneath, 2 vertical
cans up top - one 2-section and one single section. Power T is
quite meaty, and OPT's are same height as power tubes as they
sit in the chassis. 8 ohm speaker taps ONLY, a molex-like "power
socket", round phono motor tap like on the '232... pilot light tap,
single 115V 2-prong outlet... 2A fuse. Ser. #339414 stamped
directly into the chassis, FWIW.
Only serious hit I got in a search netted me a description that
referred to this as a "little brother to the SA-232, of lesser quality
but still a fine amp". Of course I didn't find this until AFTER I passed
up a '232 for the 500. So far, data on this thing is in about the same
league as chicken lips. Any links or suggestions how to learn up
on this or other Pilot EL 84 amps would be

happily welcomed. I know of
Yahoo groups, but I've had security issues there before. :dammit: