This is a wild guess but as best I recall the 6SN7 was used mainly in
low freq. multivibrator circuits in radar and TV and weren't shielded so
there was no need for a metal shield. It cam after the craze of metal
tubes wore off.
--
73
Hank WD5JFR
"Richard Knoppow" wrote in message
.. .
"Paul E. Cater" wrote in message
...
Radiosrfun wrote:
You could be right, I'm only going on "fleeting" memory. I do recall
though - seeing a few "metal" tubes in High School shop class way
back when - and as I said, I am sure I have a metal tube or two in
my stock. As to the number, who knows! I do know - about 14 years
ago - I smashed a LOT of tubes used in older radios of the 40s and
so - and more so of car radios and tvs. Try as I might to get rid of
them then, no luck. E-Bay was not yet born - DAMNED! Now I have to
look in my tube stock, the curiousity is getting to me.
"826" wrote in message
...
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.
Here is a link to an old "Woodie Deluxe" circa 1946 to 1948 that came
with a metal 6SN7 as the preamp.
http://www.ampwares.com/ffg/deluxe_woodie.html
This next link shows a guy that had 10 of them for sale.
http://listserv.tempe.gov/admin/WA.E...=-3&S=&P=46879
Here is a quote and link to a store that has them in stock.
"Whether you need a specific nuvister, or the
metal version of a 6SN7, we've got it in stock."
http://www.wizardelectronics.com/parts.htm
It is possible they might be referring to the metal base in all these
too.
I couldn't find a good picture of one in my limited search.
73,
Paul
WD8OSU
Well, it looks like there _were_ metal 6SN7's, the amplifier
definitely has three glass and two metal tubes. Its odd I can't
remember ever seeing one and I have been working with tubes since
there was nother else.
--
---
Richard Knoppow
Los Angeles, CA, USA
--
Posted via a free Usenet account from http://www.teranews.com