Wynand & Rich, In an impractical application, a Kahn envelope elimination and restoration amplifier, the 4-250A is capable of a smidge over 2KW PEP just as in plate modulated AM operation. The max plate voltage in this instance would be 6KV but, only intermittently. 73 & Good afternoon, Marv WC6W -- R L Measures wrote: W. F. --- With its max peak emission of 1.3a and a 4500v anode supply using g-g config., my guess is that a 4-250A has enough stuff to do 1000w-out PEP in SSB service provided that it is tuned up with a tuning pulser - or 50wpm dits, and the operator does not speak too loudly into the mic. On Jul 1, 2006, at 6:15 AM, W.F van Wyk wrote: > I have been hearing claims at the local flea markets here in South > Africa > that a single 4-250A valve is capable of between 800 - 900 watts in > ham band > amplifier application. > > > > Now I have used these myself in a number of homebrew amplifiers, > and never > have I even come close to that type of output from a single 4-250A. > > > > Have I missed something in my amplifier education or is this High > Grade > Fertilizer which I currently believe it is. > > > > The local experts claiming this indicate voltages on the plate in > the region > of 5,000 Volts and get a blank look when I enquire about IMD and > splatter. > > > > Now I am aware on the specification sheets for this valve RF power > above 800 > watts are indicated under certain conditions but I still have to > see that > put into practice in a Ham amplifier say for normal HF band usage. > > > > Please steer me in the right direction here. > > > > Thank You > > > > Wynand van Wyk (ZS6ARF) > > _______________________________________________ > Amps mailing list > Amps@contesting.com > http://lists.contesting.com/mailman/listinfo/amps > R L MEASURES, AG6K. 805-386-3734 r@somis.org _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps ________________________________________________________________________ Try Juno Platinum for Free! Then, only $9.95/month! Unlimited Internet Access with 1GB of Email Storage. Visit http://www.juno.com/value to sign up today!