Should have left the 6146 and 6CL6 in there. They had a negative
feedback circuit around all 3 stages to reduce IMD.
73
Gary K4FMX
Ray Burke wrote:
At one time, before the GPS satellites made them redundant, there was a
string of Loran stations along the Atlantic coast of Canada.
The workhorse at these stations was a linear, using a pair of 4CX350's,
built by Technical Material Corporation of Mamaroneck, NY and Ottawa,
Canada. The Loran is gone, but the linears are still around,
beautifully-built units, good from 2-32mhz, ideal for ham use.
Well, not exactly. These linears can be driven to full output with only
a few watts of drive into the exciter stage (which uses a 6CL6 and a
6146).
So I removed the exciter stage, and converted the 4CX350's to grounded
grid, reasoning that now the linear can be cathode-driven directly by my
Yaesu FT-900, which has an automatic antenna tuner.
That's where I'm at, and my question for the experts is: what kind of
matching network at the cathodes of the 4CX-350's is recommended??
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