On Feb 22, 9:36 am, "Theo" wrote:
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.

There were metal dual-triodes, like the 6SU7, that had the same basing
as a 6SN7. And there are lots of popular metal dual-triodes with
different basing (I'm thinking esp of the 6SC7).

I'm sure that some of the wash houses cleaned off 6SU7's, found the
market wanted more 6SN7's, and painted them as 6SN7's.

I'm 100% certain that some of the old-time retailers mentioned
elsewhere in this thread were selling washed/relabeled tubes. Heck, it
happens today still!

Tim.

I had a few hundred 6SN7 tube pulls. A few years ago, I went through the
entire box looking for a metal 6SN7, for the visual effect in a homebrew
regen. I could not find any. I thought I recalled seeing one, too.

Sadly, this may be the first positive proof that the memories of all the old
timers are collectively failing at the same time.

Not too long ago, I built a regen using a 6SJ7. I knew I had a red RCA
somewhere and looked and looked to no avail. Finally, when I was looking
for something else, I came upon the red one. Sure looks pretty.

73, Colin K7FM

I have checked all of my RCA handbooks, and they
only list the 6SN7GT.

If there were true metal 6SN7's, RCA didn't want to
talk about them. They must have been made by someone else.

Red RCA tubes were from RCA's industrial tube line. They
were supposedly higher quality than the usual faire.

-Chuck

COLIN LAMB wrote:
I had a few hundred 6SN7 tube pulls. A few years ago, I went through the
entire box looking for a metal 6SN7, for the visual effect in a homebrew
regen. I could not find any. I thought I recalled seeing one, too.

Sadly, this may be the first positive proof that the memories of all the old
timers are collectively failing at the same time.

Not too long ago, I built a regen using a 6SJ7. I knew I had a red RCA
somewhere and looked and looked to no avail. Finally, when I was looking
for something else, I came upon the red one. Sure looks pretty.

73, Colin K7FM

Chuck Harris wrote:

I have checked all of my RCA handbooks, and they
only list the 6SN7GT.

Same in the GE Tube manuals. I too would have sworn there had
been a metal version, but it must be my Alzheimers! :-)
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Calgary, Alberta, Canada

"Chuck Harris" wrote in
message ...
I have checked all of my RCA handbooks, and they
only list the 6SN7GT.

If there were true metal 6SN7's, RCA didn't want to
talk about them. They must have been made by someone
else.

Red RCA tubes were from RCA's industrial tube line. They
were supposedly higher quality than the usual faire.

-Chuck

COLIN LAMB wrote:
I had a few hundred 6SN7 tube pulls. A few years ago, I
went through the entire box looking for a metal 6SN7, for
the visual effect in a homebrew regen. I could not find
any. I thought I recalled seeing one, too.

Sadly, this may be the first positive proof that the
memories of all the old timers are collectively failing
at the same time.

Not too long ago, I built a regen using a 6SJ7. I knew I
had a red RCA somewhere and looked and looked to no
avail. Finally, when I was looking for something else, I
came upon the red one. Sure looks pretty.

73, Colin K7FM
The RCA Red tubes were 50,000 hour industrial versions.
I remember these being from the late 1950's and 1960's.


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




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"COLIN LAMB" wrote in message
ink.net...
I had a few hundred 6SN7 tube pulls. A few years ago, I went through the
entire box looking for a metal 6SN7, for the visual effect in a homebrew
regen. I could not find any. I thought I recalled seeing one, too.

Sadly, this may be the first positive proof that the memories of all the
old timers are collectively failing at the same time.

Not too long ago, I built a regen using a 6SJ7. I knew I had a red RCA
somewhere and looked and looked to no avail. Finally, when I was looking
for something else, I came upon the red one. Sure looks pretty.

73, Colin K7FM


Regarding the old timers collective memory failing - NOT GOOD - I am only
49. I came in with tubes and solid state - though I had access to tons of
tube sets and items associated. Darned it Colin, I was feeling younger than
my age - til I read that!

I've got to dig out my box of tubes, the curiousity is really getting to me.

Lou