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Ive got a few nos HOT tubes luckily. I myself have no idea what the demand is on the 20LF6 either. I dont see any ham equipment that uses this tube. You can also find the 20LF6 in the series string zenith portables from the early 70's. Luckiy, its a rare occurance to have to replace the hot, or else id be spending a lot of money in tubes. I needed a 6JS6 last year for a set and got a nice NOS rca on ebay for a $30 bin, which seemed decent.
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