[Amps] about the WARC bands of the Heathkit SB-220.

[jim.thom jim.thom@telus.net]

Date: Mon, 7 Oct 2024 17:00:47 +0400
From: Martin Sole <hs0zed at gmail.com>
To: amps at 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