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The 1R5 is a direct plug-in substitute. It just doesn't oscillate high enough to do much when you change to the shortwave bands. But, just to check that the radio is working on the AM band, it works just fine. Not all 1R5s were created equal-some will do several of the shortwave bands, and on the set I just worked on, the 1R5 couldn't do anything above the AM band-just a terrible howl coming from the speaker.
On my set, I put in a locktal tube. I didn't buy or make a conversion socket, I just soldered flying leads onto the tube pins with thick wire, and plugged it in.
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