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In Reply to: RE: State of the art, or jewelry? New tubes. posted by maxhifi on November 24, 2014 at 12:51:41
Original US made H plate 2A3s, are available all day everyday on ebay.
Doesn't matter if they're new, as long as they test good. This type holds up well in direct coupled circuits too, with a 500V supply. Without a pair of these around as a reference, you won't know how much better or worse any one of the many New production types compare.
The RCA's bring more $ for whatever reason, while the off-brand ones like a Philco (made by Sylvania) or a Silvertone (made by RCA) will be less usually.
Follow Ups:
Hmmm digging deeper it looks like the going rate for a pair of used USA 2A3's is around $100, and about double that for a pair of NOS. This is pretty darn competitive with most of the new offerings.. although the new ones promise "mono plate", "gold pins", "deluxe presentation box", etc. I should quit being a sucker for advertising and just order up some "real" tubes.
Just get a pair for reference as suggested, they might end up staying in the sockets. BTW, I've witnessed several cases where a new production replacement for an older type tube, has HIGHER MU than what it replaces, thus giving the sensation of being "more robust" or whatever, if plugged into the same hole. The Russian 6B4G's are like this, most Chinese or Russian 6L6's are too, and numerous 6550 types. It's a trick, or an accident, but don't be confused by this. I'd guess the JJ's have this "quality" as well, but I never tried them.
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