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

[Thomas Adams]

If memory serves, the preferred brand for modification was Sylvania.

The beam forming plates were soldered to the cathode lead inside of
the 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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