[Johnson] "Different" 6146

[Sherrill Watkins]

Glen: Are the tubes unstable owing to a parasitic or a neutralization
problem? Are the tubes truly electronically "matched" tubes? I suggest to
contact by email Mr."Richard" at Leeds Electronics in Brooklyn, New York. He
is one of the most knowledgeable persons I have ever talked to about vacuum
tubes and he may be able to provide information on these odd tubes. (I cannot
remember his last name? I think it is Matthews?) Leeds Electronics advertises
in Electric Radio Magazine and generally keeps a supply of 6146's. I also
think they have a web site? -73- Sherrill W. k4own

-----Original Message-----
From: Glen Zook [mailto:gzook at yahoo.com] 
Sent: Tuesday, July 26, 2005 1:30 PM
To: johnson at mailman.qth.net
Subject: [Johnson] "Different" 6146


Although I have seen various versions of the 6146
family of tubes, I ran into a couple yesterday that I
have not seen before.  I am working on a transceiver
that has problems in the final amplifier so I "pulled"
the tubes.

These tubes are marked "made in USA" but have no other identifying marks on
them except the letters FADF.  It took me a few seconds, but if you take the
letters and change them to their equivalent numbers, then the tubes are
marked.

A = 1
B = 2
C = 3
D = 4
E = 5
F = 6

and so on.  Therefore, FADF = 6146

The internal structure looks pretty much like most
6146 family of tubes.  However, this particular pair
of tubes is pretty unstable (like 6146B tubes can be
in circuits designed for the 6146 / 6146A / 8298).

I am pretty familar with various versions of the 6146.
 However, this particular version had escaped me until
now.


Glen, K9STH

Web sites

http://home.comcast.net/~k9sth
http://home.comcast.net/~zcomco

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