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.
(BBI)
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