I don't know much about the inside of tubes, but it seems to me that
if the grid was getting smaller then it would take a large negative
voltage to stop those electrons getting to the plate.
The real gain (at rf) has not changed significantly.
- Paul
At 09:54 AM 12/20/2013, you wrote:
Hi Paul:
Generally, with age, a tube can go "flat", which means reduced gain,
which means you need to reduce the negative bias voltage to run the
same current. You have the reverse, and we know that gain of tubes
does not generally increase. So, I suspect something else. Perhaps
the filament voltage has increased slightly, which causes more gain
of the tube.
73, Colin K7FM
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|