Hi,
I have several used 4CX250Bs that I want to try to put to use.
State of the tubes is unknown. They are pullouts. I will test them
including hipot, as was detailed on this list a few days ago.
Now if some pass the hipot and other tests, there is still the secondary
emission problem with an used valve of this kind.
So I was wondering if would be possible to use a 4CX 250B with both its
grid and screen connected together to ground.
Will it behave as a grounded-grid triode?
Will then secondary emission still be a problem?
How many 4CX 250Bs connected in parallel woul it take to have a cathode
circuit with a reasonable match to a 50 Ohm input drive?
Vy 73
Angel Vilaseca HB9SLV
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