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Re: [Amps] Triode Amps

Subject: Re: [Amps] Triode Amps
From: Kim Elmore <>
Date: Fri, 3 Dec 2021 18:23:28 -0600
List-post: <>
I should have qualified my response: 1500 W is indeed possible out of a pair of 3-500Zs, but the cooling must be letter perfect: air sockets, proper chimneys and proper plenum pressure. I suppose you could get 2+ kW out of a pair of you ran them at a much higher B+ (well over the 4 kV max defined by Eimac), higher I_p and at the grid dissipation limit, i.e., and well out of their limits, but they won't last very long that before they fail. If cooling is sufficient, I suspect you could run 1.5 kW output for RTTY and FT8 (essentially CCS), but there probably won't be much head room.

Kim N5OP

On 12/3/2021 12:54 PM, Ron W4BIN wrote:
On 12/2/21 1:29 PM, Kim Elmore wrote:

The 3-500Z is an excellent tube, but 1500 W isn't reasonably available out of a pair, even at increased plate voltage.

  I don't know about that, there are guys (free banders) on YouTube that have no problems demonstrating a Heath SB220 with new Chinese tubes and the original power transformers that are putting out 2,600. Watts dead key.

Kim Elmore, Ph

Kim Elmore, Ph.D. (Adj. Assoc. Prof., OU School of Meteorology, CCM, PP SEL/MEL/Glider, UAS, N5OP, 2nd Class Radiotelegraph, GROL)

/“I occasionally play works by contemporary composers and for two reasons. First to discourage the composer from writing any more and secondly to remind myself how much I appreciate Beethoven." – Jascha Heifetz/
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