If you can find one of these rare thermionic treasures (ECLL800, AKA 6KH8), it is the basis for a simple three-tube, 8WPC PP amplifier
(if you eschew the tone controls).
I have one single Telefunken ECLL800, which I've been saving, as a replacement for a vintage German radio. Best thing is,
it was deeply "hidden" in a Xerox copy paper box full of loose "plinkers", but there were a couple of layers of very nice NIB / NOS tubes
hidden in the depths of the box, which I found at a Sunday flea market in Hollis, NH, about 7 years ago. For the princely sum of $15.
Tube Data: (in German) http://frank.pocnet.net/sheets/062/e/ECLL800.pdf
/ed B