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Hi,
It was only made with a glass envelope. Some had metal bases. Vern "Radiosrfun" wrote in message ... Steel or other sort of metal, i'm not sure - seems to me - there was in fact a metal 6SN7. I further believe I have one in my stock of tubes - somewhere. IF I can find time to look - and do find one - will send the interested party - a photo of it. "Henry Kolesnik" wrote in message . .. I've never seen or heard of a steel 6SN7 and I started with tubes in the early fifties. Now you have me wondering about metal tubes and except for 6L6 most were real popular in car radios and 5 tube ac dc, also military. Does anyone recall the first metal tube, who made it, why and what they touted as their advantage other than it wouldn't break if dropped. I also recall a real hi power amp being made with 6L6s that were cooled by them hanging udside down from the chassis in a bowl of water and others immersed them in oil. -- 73 Hank WD5JFR "Theo" wrote in message ... Regarding the "all metal" tubes series by RCA, can anyone tell me if there was ever a metal version of the 6SN7? I cannot find any reference on the web. Any help would be greatly appreciated. |
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