I've just finished building up a superb amplifier kit from Victor and Yana
at eb104.ru that uses phase-change cooling. It will output 750 clean SSB
watts with 4.5 watts of drive once I replaced the 10-dB attenuator pad with
a 4-dB pi pad, namely a shunt 220, a series 24, and a shunt 220. The
attenuator is easily accessible without any disassembly. (Arithmetic would
suggest that the unmodified amp could be driven to near full coutput by the
KX3.) It employs one BLF188 as the active device with well designed
protection from excessive drive, SWR, or drain current.
The amplifier is elegantly constructed, complete, and tested. You need only
install it and its connectors into the included enclosure. As I should have
expected from phase-change heat transfer, it runs cooler than any amplifier
I have ever operated. See details at
https://eb104.ru/internet-magazin/usiliteli-moschnosti/eb1200-heat-pipes-cooling-systemI have built many amplifiers using eb104.ru modules. Their boards are of
the highest quality in design and performance.
You will have to supply 13.8 VDC, 50--53 VDC at maybe 35 amps, and an
external bandswitch box with a wafer switch, since the amp is designed to
be bandswitched by a transceiver via the DB25 on the rear panel. To play
it safe I would use a PNP PTT circuit to protect the KX2's key out circuit
from the current drawn by the (three) bandpass filter relays in the amp.
Chuck w8mqw
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