715B Tubes

[John M Iverson]

Memories.    Back in the early sixties I had a large group of 715Bs.
looked at them for quite a while, saw the application, and thought,  that
would be quite a linear.
 the four cathodes from the 300B had a very large emission
capability------------
 any how, after a lot of trying built a linear with 2- 715Bs  in
parallel.  The cutoff bias was about 6 volts or so with 3 kv on the
plates.  ran the idle plate current at 50 ma, 25 per tube.. drove the
thing with a 20A, cathode driven.  got lots of power in the ant, about
800 W PEP.  BUT  when one decided to arc over, the national R-175 plate
choke lost its windings the hard way, all over the room. The output
filter cap on the 3 kv supply was 40 mfd.  need one say more?   ah
nostalgia.    old jack
                          73s
Jack Iverson    K0EWU    jackiv at juno.com
ARRL,  IEEE LM,  RCA, AMI, ARCI, QCWA,CCA

On Fri, 30 Apr 1999 14:24:04 -0700 Jerry Seligman <w7bun at WA.NET> writes:
>I have six Raytheon 715B tubes. I have no way to test them, but they
>appear new. Does anyone know what they are? Is anyone interested in
>making an offer for them?
>Jerry W7BUN/N7PP
>
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