[R-390] CV133 vs 6C4

[Tim Shoppa]

"ELDIM" <eldim at att.net> wrote:
> will always live on.  You stirred my interest to dig out some of my custom &
> specialized manuals to see what they had on the subject.  I know they were
> of UK/Great Britain origin and appear on a lot of my WWII military tube
> boxes and even later on.   I was surprised that they did not appear in my
> 1st Edition, August 1950,SECTION 16-820 CATALOG of NAVY MATERIAL, BUREAU of
> SHIPS SECTION- PART II, titled "ARMED FORCES CROSS INDEX of ELECTRON TUBES"
> which was edited & formated by Check Penson WA7ZZE.  I also have A GUIDE TO
> SPECIAL PURPOST TUBES, published by GRAHAM ELECTRONICS SUPPLY, INC.
> Copywright 1955, which also has no reference to these designations.  My TV-7
> Set-Up Booklet, dated OCT 1957 has reference and Settings for a little over
> two pages of these CV numbers at the end.

Much much later, I notice that I have a number of JAN-labeled tubes made
by Philips in the 80's. Presumably these were made in Europe but I'm guessing
they carry only the JAN number because that's the contract they were made
under. I wonder whether they made identical tubes but labeled with whatever
the CV equivalent is for a 5814A etc.

Otherwise most of my mil/industrial numbered tubes seem to be US-made.
I think I've got some non-US consumer tubes poking around in my Heathkits
and Eicos.

Someone once tried to convince me that the euro EC-tube number system
(e.g. ECC82) made a lot more sense than our system (filmanet voltage +
letter(s) + number of terminals) but they didn't convince me. Maybe
there is a rhyme and reason to the CV numbers but I don't see it.

> p.s. If any of you have Tech Data on Vacuum Tubes that you'd like to share
> then lets hear from you.

A website that seems to have a lot of Euro tubes in its index is
at http://tdsl.duncanamps.com/tubesearch.php and if I poke around
I see CV numbers into the tens of thousands! And I thought our system
with "A", "B", "W", "WA" etc suffixes was out of control! In any event
they have very good links to hypertext data and often PDF's of the
original spec sheet, and when they don't have specs for a specific number
they cross-link to sheets for similar tubes.

Tim.