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I think I saw that circuit on worldradiohistory.com It use a 12AT7 as a preamp and cathode follower. Are you trying to add that to an existing receiver?
I chose the solid state route. Its easier than you think.
The left module is for a Heathkit and the right module is for RCA
They're built totally different. One uses a video op amp and the other uses 2 bipolar transistors. Connect after (or remove) the sound trap. You could put in a switch or relay if you want to use the RF input as well.
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Last edited by kf4rca; 07-30-2024 at 02:17 PM.
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