On Sep 25, 2006, at 3:09 AM, Peter Voelpel wrote:
To me that is hard to believe.
I never recognized any emission current higher then a few microamps
without
voltages on other electrodes of a tube.
Current flowing has nothing to do with the rate at which electrons
are being boiled off of the tungsten dicarbide (W^2C) layer on the
filament.
Without anode voltage there will be only a cloud of electrons
formed above
the catode.
There will be a large difference on the number of emitted electrons
from the
cathode at a tube just heated and the one at full emission.
The emission goes up with the anode voltage and starts very low at
almost
zero emission current up to the saturation point, which is
certainly not
reached, as the tube is already well above dissipation limits before.
So it can?t be the SAME rate either at which the clock ticks.
73
Peter
________________________________
From: ham_amplifiers@...
[mailto:ham_amplifiers@...]
On Behalf Of pentalab
How does ?the clock tick? when just the heater is lit and no
current flows?
### anode/grid current/drive power has nothing to do with
emmision. Take 2 x identical linear's..... one with just the
fil /blower on.[no HV no drive applied] ..and the 2nd linear
with HV on and drive applied [dead cxr]. The tube in each
amp will lose emmision at the SAME rate.
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