I had forgotten about the beam forming plates! Just like the 1625 versus the
837 although some brands of the 1625 had the beam forming plates connected
outside of the glass envelope and therefore can be removed from the cathode and
connected to another pin.
Glen, K9STH
Website: http://k9sth.com
--- On Wed, 2/11/09, Bill Fuqua <wlfuqu00@uky.edu> wrote:
The problem is that the beam forming plates are connected to the cathode. That
by-passes the shielding between the plate and cathode done by the grids. You
may have instability. In the case of some others such as some 1625's you can
separate the beam forming plates from the cathode by simply removing the base
or drilling a hole in it and unsolder the lead from the pin and moving it to
another pin. You can't with this tube.
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