The specifications for the 4-250A are the same as the 4-400A except
for the plate dissipation. The 4-400A has fins added to the anode. I
prefer the 4-250A tubes when I have an amplifier with a window. In SSB or
CW a pair glows much better at full output power.
73
Bill wa4lav
At 10:13 AM 8/25/2004 +0100, Steve Thompson wrote:
I've come across some of these tubes - are they useful as spares for any
commercial kit? Do they have any particular vices or virtues?
Thanks,
Steve
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