[MCARC] Fun day

[Mike Stillwell]

Attached is another version (simpler design) that doesn’t need a separate power supply. 
https://www.eham.net/article/23070There is a company Harbaugh that makes upgrades for older linear such as the Heath SB series.mike ----- Original Message -----
From: Dennis Mason <masondw at bluevalley.net>
To: Marshall County ARC <mcarc at mailman.qth.net>
Sent: Sun, 08 May 2022 18:07:08 -0400 (EDT)
Subject: [MCARC] Fun day

/**/Guys …   IF someone desires to use one of the “older” linears on a newer rig, there is a consideration of the compatability.  The old linears , like my National and Heathkits have about 50 volts or more for keying them up.  A friend in Lincoln bought a Heathkit SB 200 and the keying voltage was 120vdc, too much for new rigs.  Today I built a converter that inserts between the old linear and new rigs with only about 17v dc keying.  Neat thing was, all I had to buy was a transformer at Hometown lumber.  (about $27.00)  Photo showing:                     Dennis  Sent from Mail for Windows 
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