I have a number of 4-1000A tubes. If you are willing to pay the price you
can get new ones made by Amperex ( Covimag) which are more rugged than the
EIMAC ones.
I usually get them at hamfest and since I have my own portable tester I can
check them right there.
The Amperex tubes have graphite plates and it is better supported than the
EIMAC ones. I have often gotten EIMAC ones that were dropped in shipping
and the anode bent off to one side. I have been able to straighten up
almost all of them but it is a bit risky. I think Triton has quit making
them. They could never get the big glass triodes and tetrodes right.
73
Bill wa4lav
At 03:21 PM 12/8/2010 -0500, Dennis Goebel wrote:
>I have found it increasingly difficult to locate good 4-1000a tubes. Just
>wondering what would be a good replacement tetrode for the 4-1000a in grid
>driven service. Not grounded grid.
>Obviously it doesn't have to be the same socket or filament voltage as the
>4-1000a.
>It would be nice to come close to some of the other parameters so
>recreation of the entire amp wouldn't be needed.
>I have thought of the russian GS-23 or GU-74 series tetrodes. Or home
>grown variety like 4CX1000 or the like. Most of these have pretty wimpy g1
>and g2 parameters compared though.
>Anyway I would like to get some opinions from the experts on the reflector.
>thanks
>Dennis
>
>
>
>
>
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