6KG6A/EL509 Substitute for 8950 Tube?

Brian Carling af4k at EARTHLINK.NET
Thu Nov 25 08:29:59 EST 1999

David (& others) - if you need a filament transformer, let me know.
I can supply just about any voltage and any current.


On 24 Nov 99, at 11:48, DavidC wrote:

> I am looking at an amp that runs one 8950 driving three
> other 8950's.
> I know that the 8950 tubes are priced out of sight but am
> told that with a filament change from 12v to 6.3v the Svetlana
> 6KG6A/EL509 is a direct replacement.  True?
> If more than the filament voltage needs to be changed, what are
> the other changes, please?
> What sort of average peak SSB output should I expect from such a
> design?  Not momentary whistle or shout-swing but solid voice output
> power?
> Any reason why converting this to 20 meters would be improbable?
> I understand there is room in the RF compartment for larger coils.
> Any recommendations as to how to instruct the seller to test the
> power transformers with a DVM?  He is willing to do so.  The internal
> power supply converts 12VDC to the necessary voltages.  They are
> designed for mobile use and thus fit my all-DC shack plans nicely.
> (I am actually getting three of these, hope to yoke two together with a
> splitter-combiner and use the third for spare parts.  I'm guessing 600
> watts SSB output on 20m from a pair.  Yes, I will use a good filter on the
> output!)
> I am also told that the 6KG6A/EL509 tubes run about $20. each,
> anyone have a better source if I buy 4 or 8 at a time?
> - Thanks! & 73, DavidC  K1YP
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