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    RCA Mark VII- Early Crystal controlled Base station Questions

    I recently purchased a 4 channel crystal controlled RCA Mark VII tube base station. It has a 4 channel crystal controlled transmitter. The receiver can be tuned by either a 23ch VFO or four receive crystals. The radio has been recapped, works and sounds great, but the 4 channel limitation of...
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    Johnson Messenger 223 With Diode Problems

    I've been working on restoring a Johnson Messenger 223 I purchased on ebay. The synthesizer board contains two diodes in the receiver section, d102 and d103, that are completely open. They're 1n881 diodes, an obsolete component that I cant find a modern equivalent for. I found a datasheet that...
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    Getting 40 Channel Coverage on a 23ch Cobra 135?

    I've got a mid 70's Cobra 135 base that I'd like to use for SSB Dx. It's a 23 channel radio, and has really good sounding audio and a great receiver section. I'd like to use it on sideband, but most LSB calling happens up on channel 38. This presents a bit of a problem on a 23 channel radio. I...
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    Cobra 25 ERF2030 Upgrade

    Hello Everyone! I just finished installing the ERF2030 MOSFET upgrade in a Cobra 25. It works, but the problem is, I'm only seeming to get a 1 watt dead key, and about 4 watts swing into a dummy load with the mic gain maxed. I followed the instructions on cbtricks.com to the letter. Shouldn't...
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