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.

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.

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.

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.

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.

"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.

AFAIK no metal 6SN7 tubes were ever made. Metal tubes
were announced about 1935. The idea was that they were
self-shielding. For a time the use of these tubes in radio
sets was advertised as meaning they were the most up to date
designs.
In comparision to glass envelope equvalent tubes metal
tubes generally have slightly higher inter-electrode
capacatance and also sometimes had problems with sealing.


--
---
Richard Knoppow
Los Angeles, CA, USA




--
Posted via a free Usenet account from http://www.teranews.com

Metal tubes were the first octal based tubes (1935). The GT came later.

Tube Lore, by Ludwell Sibley (http://www.eht.com/oldradio/tubelore/) is a
must have if you want to go deeper into the history of tubes.

The 6SN7 was always a GT.

Steve.
--
Steven D. Swift, , http://www.novatech-instr.com
NOVATECH INSTRUMENTS, INC. P.O. Box 55997
206.301.8986, fax 206.363.4367 Seattle, Washington 98155 USA

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

"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

Guess I have to pull out my gear and take photo's of the METAL 6SN7's that
have been working in there for MANY YEARS. Might even provide a clue as
to who made them !
ERG

"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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