Date: Mon, 7 Oct 2024 17:00:47 +0400
From: Martin Sole <hs0zed@gmail.com>
To: amps@contesting.com
Subject: Re: [Amps] about the WARC bands of the Heathkit SB-220.
HI,
There are 2 potential areas of concern:
1:??? The input tuned circuits are configured for the bands on the band
switch. You may be able to find a compromise tuning that allows WARC
band coverage.
2:??? The plate RFC may have a resonance close to one of the WARC bands
an operation there may well cause a big flashbang! You might consider
something like the old Ameritron choke which is generally considered to
be free of nasty resonances if in good space.
## Oem heathkit plate choke is just 50 uh....and it's 1st series
resonance is apex 35-40 mhz. Plate choke is not an issue on 80-10m.
Jim VE7RF
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