[Milsurplus] Brands to 1625 tubes to convert to triode operation?

[gl4d21a at juno.com]

Group:

I finally pulled the biblio off the shelf, and the original article on triode 1625 conversion was in QST Nov. 1957, P. 87.

HTH
George
W5VPQ

---------- Original Message ----------
From: jcoward5452 at aol.com
To: quixote2 at ix.netcom.com, catman351 at gmail.com, milsurplus at mailman.qth.net
Subject: Re: [Milsurplus] Brands to 1625 tubes to convert to triode operation?
Date: Fri, 19 Mar 2010 20:33:13 -0400




Don't tell me someone will declare the venerable 1625, after modification, is the hottest Class A audio amp tube around...The've already shackled the 1626..I can see it now,a modified SCR-274N or AN/ARC-5 transmitter mod to high end audio amp and you open up the little access lid in back and you have an eye tube Vu indicator!
 Jay KE6PPF





-----Original Message-----
From: Thomas Adams <quixote2 at ix.netcom.com>
To: C Eus <catman351 at gmail.com>; milsurplus at mailman.qth.net
Sent: Fri, Mar 19, 2010 12:13 pm
Subject: Re: [Milsurplus] Brands to 1625 tubes to convert to triode operation?


If memory serves, the preferred brand for modification was Sylvania.
The beam forming plates were soldered to the cathode lead inside of
he base.
Mr. T.

At 10:17 19-03-10, C Eus wrote:
Hello to all:
I understand that there were a few 1625 tubes that could be operated as a
triode after all three grids were paralleled.  The caveat is that a grid,
which was connected to the cathode,  had to be physically removed from the
cathode.  This was done by cutting the base and gaining access to that
connection point that joins the grid and the cathode together and doing the
appropriate modification.  There were a few tube brands that were not
modifiable in this way.  RCA comes to mind.  However, I know there should be
some others that could be modified.  Does anyone know of these brands? What
about the Russian 1625's?

I appreciate this and thanks.

Cal, N6KYR/4.
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