[Boatanchors] any users of 813 amps out there?

Michael Tortorella w2iy at verizon.net
Sat Sep 29 21:54:28 EDT 2012

Hi again,


A really neat RF deck with a pair of 813s followed me home from a hamfest
last weekend.  Really well constructed by W0LIO in 1973 (it is so labeled!).
I have spent this week looking around for possible sources of schematic
information but almost everything I encountered was either a single 813 or a
grounded-grid circuit.  I haven't checked carefully, but I think this one is
not GG because of the robust tuned circuits at the front end.  Might anyone
have a lead to any relevant information?  I checked the QST archives and my
old handbooks (1961, 1968, 1978, 1981, 1988, 1992, and 2006) with no
success.  Google brings up hundreds of relevant hits, so many that I got
overwhelmed.  Anyway, so far no joy.  If I can figure this out (and build a
power supply for it) I may consider selling my Thunderbolt as it weighs
about as much as a small planet and it's just getting too hard to wrestle
around any more.  Any help greatly appreciated.


Thanks for reading and 73 to all,

Mike W2IY

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