I once tried to run 10 or so 837s in parallel when I was a kid. It did not
work well, just could not get the pi output to tune. I had a roller inductor
and could get any combination I wanted. It still would not tune but did get one
contact with it. I was about 14 maybe 15. However, when I disassembled it and
took a close look at the roller inductor, I discovered that one end of it was
shorted to the wiper and I had it used the shorted side of it. Did not bother
to but it back together. I was driving it with my Viking Challenger.
73
Bill wa4lav
________________________________
From: Amps <amps-bounces@contesting.com> on behalf of Roy Koeppe
<royanjoy@ncn.net>
Sent: Wednesday, December 6, 2017 4:52 PM
To: Amps@contesting.com
Subject: Re: [Amps] Multi tube amp
I paid a whopping 25 cents each for the RCA 1625's in factory boxes. Maybe
from B-A. Power supply used six TV power transformers with primaries in
series-parallel for 220 volts (yes 220 back then!) and secondaries in
parallel. Also from B-A. Ran class AB-1.
73, Roy K6XK
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