Makes no sense comparing to older tubes? It makes a lot of sense to me. They
are a benchmark for the new Chinese tubes quality. It has nothing to do with
obtaining them.
Lee, w0vt
----- Original Message -----
On 5/2/2013 3:32 PM, MU 4CX250B wrote:
> I'm afraid I don't understand why the plate dissipation would affect
> longevity, provided the tubes have adequate cooling. Exceeding rated
> grid current or plate current, or using the wrong filament voltage
> could kill the tubes, as could inadequate cooling, but I don't see
> why running the tubes at their rated dissipation with plenty of air
> would shorten tube life, if all other tube parameters were within
> specs,
That's because you are interested in the emission capabilities. If it
wont even make the plate dissipation rating, something is wrong.
Look up the tube data sheet and see what the max plate current should
be. The tube should be capable of this figure as a minimum. You are
really checking the emission.
73
Roger (K8RI)
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