[Fwd: Re: [Fwd: [NJARC] Tube ID]]

[Al Klase]

-------- Original Message --------
Subject: Re: [Fwd: [NJARC] Tube ID]
Date: Sat, 20 Nov 2004 14:14:40 -0800
From: Ludwell Sibley <tubelore at jeffnet.org>
To: Al Klase <skywaves at webex.net>, amagoun at davidsarnoff.org, 
        njarc at qth.mailman.net
References: <419FB56C.7090703 at webex.net>

What he's looking at is a big water-cooled transmitting
triode of the style that was used for AM broadcasting
and, to some degree, radio-frequency heating.
It's of a size that could dissipate perhaps 20-40 kW and
would therefore be useful for 50-100 kW output (we
can't be sure because so little of the copper anode is visible
at the bottom - all we can see is the little flange that
supports the tube in the cooler).  But the large diameter
of the anode is a strong hint.
Here's Lud's reply:

This is not one of the regular marketed RCA tubes of
the day, like the 893; those tubes all had sidearms for the
grid lead, as opposed to the (fragile) little stalk out the
top.  This one has only a single filament, too (the two
flying leads), at a time when three-phase filaments were
all the rage.  We have to call it a developmental item!
And we can't be sure *whose* developmental item -
RCA sold water-cooled tubes like the 862 on a bought-
in basis from GE and Federal . . .

Lud

Al Klase wrote:

> Didn't know if you're on this reflector.  Alex could use you're help. 
> - Al

-- 
Al Klase - N3FRQ
skywaves at webex.net
Flemington, NJ 08822
Web Page:  http://www.webex.net/~skywaves/home.htm