Hi Jeff,
This sounds like another "how do I get more out than the tube I want to use
was designed for" application.
Indeed, the 3-500 tube is an excellent choice for amateur amplifiers. A pair
in the right amplifier will put out 2000+ watts.
It is usually better to design for near maximum ratings if the purpose is
maximum power out.
Think about it, why not use a tube capable of higher power out rather than
try and take a particular tube and force it beyond it's ratings?
Just like anything else, it will fail early or give unsatisfactory service.
Design CONSERVATIVELY and be rewarded by years of good service.
73, Dan Magro W7RF, (President WARC 1999, member SCDXC, SCCC)
Manufacturers Rep & Distributor for HENRY RF Power Amplifiers.
RF Applications Power Measuring equipment, See the VFD & WinWatt!
www.radiodan.com <http://www.radiodan.com> RFpower@radiodan.com
<mailto:RFpower@radiodan.com> A trip to our web site is worth the click!
> -----Original Message-----
> From: owner-amps@contesting.com [mailto:owner-amps@contesting.com]On
> Behalf Of Jeffrey A. Madore
> Sent: Sunday, October 10, 1999 10:39 AM
> To: amps@contesting.com
> Subject: [AMPS] Re:No Brainer
>
>
>
> Ok, I will openly and upfront, admit that I have little function
> in the neuro synaptic regions. Lyme Encephalitis and associated
> chemo is taking it's toll.
>
> My question is: A single 3-500Z amp is usually rated around
> 1KW +/- out. With low duty cycle service, such as ssb, would it be
> possible to get more output without serious loss of tube life?
>
> Next question: According to my ARRL hand book, Max Ep for
> the 3-500Z is 4KV. Is it better to run at higher Ep and thus
> lower Ip at a given power level? Would this extend the life of
> the cathode? Would an Ep of 5 or 6KV be reasonable or destructive?
>
> Thanks for any input, and for all of the discussion on SWR/
> transmission line characteristics. This has indeed been stimulating.
>
> Respectfully,
>
> Jeff Madore
> K1LE - CT
>
>
>
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