>Hi Helge,
>
>Re: Your 4CX250B comments.
>
>I've had the same set of Eimac 7203/4CX250Bs in my two meter amplifier since
>1981. Run it with Ep = 2500V, Eg2 = 350V, lots of air, and 1 kW PEP output
>power for, oh, about 10,000 hours so far -- same tubes, still generating 1
>kW PEP output at 144 MHz. Ip = 615mA, Eff = 65%, Pdiss = 538W, which is
>7.6% above continuous rating per the data sheet. With proper loading, Ig1
><10 mApk
? On SSB. running grid current with 4cx250Bs substantially increases the
chances of one getting tarred and feathered at the next Ham swap meet.
>and Ig2 = about "zero," plus or a minus a few mA.
>...
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|