[BULK] - [Amps] NCL 2000?

rlm r at somis.org
Wed Oct 1 04:37:44 EDT 2003



>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.
>...


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