Hi Francois.
Running the tubes on filament only does not help at all. You must
apply drive to activate the gettering process.
See
That is a good method. Run the amplifier at low anode volts
(around 1kV) and apply drive, with plate and load not tuned and
and get the anodes red.
If you have a 1kV Megger, you can check the tubes initially. It
will show if the tubes need attention. There should be no
breakdown between filament and grid on good tubes. If there is,
then you can do the above process. I have rescued a few tubes in
that way. It works very well.
73, Alek VK6APK
On 8/01/2025 4:27 pm, Fran?ois via
groups.io wrote:
toggle quoted message
Show quoted text
> This happens in Australia as well where we have 400W
PEP limit. At that level, the anodes never get red, so the
tubes fail very quickly.
> You will need to exercise your amplifier at full
power regularly to ensure healthy tubes.
Thank
you for this very important information. The PA has not been
used for 10 years. So there is no point in heating the
filaments for only 1 or 2 days to hope to degas.
?
I
need to heat the anodes. I did not know this particularity.
De
la part de
Alek Petkovic via groups.io
·¡²Ô±¹´Ç²â¨¦?: mercredi 8 janvier 2025 08:35
