Wow.. The Farnsworths are coming out of the wood work!
Here's one on Ebay:
http://cgi.ebay.com/FARNWSORTH-MODEL...item2eb440795d
I'm not affiliated with this listing or Ebay.. Just had to say that .. and always wanted to say that.. so I did!.
Nice!
I like the audio output stage... At least on mine.. it's push pull with a phase inverter (6S07)
Buzz...