Hi All,

Someone in a newsgroup discussion on grey versus black plates has
mentioned that black plates may be better because they are older, thus
they are produced with better tooling and construction, and it is not
due to plate material.

Well, aren't some of the Russian 6P6S and 6P3S (not 6P3S-E) from
Reflector which Sovtek used to buy and label as 6V6GT and 6L6GC made
from 1940's vintage Russian tooling (which I think are Philips
tooling)? In some cases, the Sovteks may have been produced using
vintage Philips plate material (or some other NOS vintage material if
not Philips). If old tooling and material means good quality, then
the Sovtek 6V6's and 6L6's should be good, but according most of you
people, they aren't. (I like them, and I use them in audio; I choose
to save my NOS vintage US-made tubes for radio restoration projects.

Regards,

C.W.

"Casino" wrote in message
om...
Hi All,

Someone in a newsgroup discussion on grey versus black plates has
mentioned that black plates may be better because they are older, thus
they are produced with better tooling and construction, and it is not
due to plate material.

Well, aren't some of the Russian 6P6S and 6P3S (not 6P3S-E) from
Reflector which Sovtek used to buy and label as 6V6GT and 6L6GC made
from 1940's vintage Russian tooling (which I think are Philips
tooling)? In some cases, the Sovteks may have been produced using
vintage Philips plate material (or some other NOS vintage material if
not Philips). If old tooling and material means good quality, then
the Sovtek 6V6's and 6L6's should be good, but according most of you
people, they aren't. (I like them, and I use them in audio; I choose
to save my NOS vintage US-made tubes for radio restoration projects.

Regards,

C.W.

That may be the case, but old tooling was great when made, and gets old &
worn out just like anything else. Also, the people running the tooling -
their blood alcohol level, etc., etc., count...

Shiva wrote:
"Casino" wrote in message
om...

Hi All,

Someone in a newsgroup discussion on grey versus black plates has
mentioned that black plates may be better because they are older, thus
they are produced with better tooling and construction, and it is not
due to plate material.

Well, aren't some of the Russian 6P6S and 6P3S (not 6P3S-E) from
Reflector which Sovtek used to buy and label as 6V6GT and 6L6GC made
from 1940's vintage Russian tooling (which I think are Philips
tooling)? In some cases, the Sovteks may have been produced using
vintage Philips plate material (or some other NOS vintage material if
not Philips). If old tooling and material means good quality, then
the Sovtek 6V6's and 6L6's should be good, but according most of you
people, they aren't. (I like them, and I use them in audio; I choose
to save my NOS vintage US-made tubes for radio restoration projects.

Regards,

C.W.


That may be the case, but old tooling was great when made, and gets old &
worn out just like anything else. Also, the people running the tooling -
their blood alcohol level, etc., etc., count...



I believe the most difficult part of the vacuum tube manufacturing
process to be the creation of a decent cathode coating material.

It is essential that the cathode material be the right mix, and be
spread with an even thickness. Very subtile differences here can
make or break a good tube. The whole "cathode interface" debacle
was caused by extremely minor impurities found in the cathode
substrate, and in the coating material.

-Chuck

-Chuck

Hi Yves,

I would hope that they keep the cathode coating mixes
and the filament insulation mixes out of the air
space used by the workers. Some of the compounds used
aren't all that good for your lungs.

-Chuck

Yves Monmagnon wrote:


Mmm...., What is the effect of an alcoholic breath over the cathode mixing
pot ?
Add some spirits to the sound !
Hips ! Yves


-Chuck

-Chuck