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Re: [Amps] Triode Amps

Subject: Re: [Amps] Triode Amps
From: Kim Elmore <>
Date: Fri, 3 Dec 2021 20:26:03 -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.

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