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https://www.nostalgickitscentral.com/
Pictures schematics and lots of other information on Heathkit - EICO - Allied Radio - EMC - Paco - Precise - Dynaco - Stancor and Conar kits
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https://kf5czo.blogspot.com/2012/02/heathkits-first-amateur-transmitter.html
A blog about ham radio, vintage technology, interesting developments in science and anything else I think someone might like to investigate.
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