[Amps] 4cx800a

[Michael Tope]

Thanks to everyone for the feedback on Dr. Alex UR4LL. From all accounts 
he is a very good person to deal with.

That brings me to my next question. Is the GU74B truly pin-for-pin 
compatible with the 4CX800A? IOW, can I plug two GU74Bs into my Alpha 
91B and expect the same kind of performance that I get with the 4CX800As 
that are in there now?

Thanks,

Mike W4EF.................................

On 2/15/2010 6:13 PM, Michael Tope wrote:
> Is there a reliable supplier of NOS GU74B/4CX800A's? I have an Alpha 91B
> and was thinking that I should pick-up some spare tubes for it before
> the NOS pool dries up completely. I see that UR4LL is advertising them
> for $100 each. That seems too good to be true. Is he legit?
>
> BTW, I agree that the 4CX800A isn't a terribly clean tube for SSB
> service. All the commercially available amps I've seen with this tube
> (including the Alpha91B) have mediocre IMD specs.
>
> Thanks,
>
> Mike W4EF...................
>