I'm not very familiar with the L7 Francois but if I guess you
could do two tubes at once.
Even if you just turn on the amplifier and key it, at full plate
volts, if you think the tubes are OK. Run it like that without any
drive and maybe you will get enough anode current for you to see
the anodes glow red after some time. If you get 100mA per tube,
that is 250W. The anodes should glow red after a while.
If you know the tubes are not good, you should go with the W8JI
method of lowering the voltage, if possible.
On 9/01/2025 2:04 pm, Fran?ois via
groups.io wrote:
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Thanks
for this very interesting post. It should definitely be
adapted to a 3-500ZG (graphite anode) because the photograph
shows a 3-500Z with metal anode
?
So
900 V 250 mA (225 W) and the author states:
Watch the color of
tube anodes. Anodes should be a very faintly detectable
red. Do not run the tubes too hot.
?
In
the case of the L-7 which uses two tubes in parallel, what
would be the best solution to achieve cooking? (remove one
tube?)
De
la part de
Alek Petkovic via groups.io
·¡²Ô±¹´Ç²â¨¦?: jeudi 9 janvier 2025 00:12
