>> What is the maximum ratings that you can drive the YC156 too. One
>> presumes you have to stay in the 5000 watt plate dissipation rating. If
>> so one would be better just to use the ordinary 3cx5000, which is
>> cheaper and more available.
>The 3CX15000B7 data sheet gives typical operating conditions of 10.2 KW
>upsful power with 6 KV at 2.6 Amps, 300 watts drive. By my calculations
>that results in slightly more than 5 KW anode dissipation.
? sounds reasonable.
> I would not
>want to run a YC-156 that way in CW or RTTY service
? As I understand the ratings, 10 out on RTTY should be doable.
>but given the duty
>cycle for SSB, I suspect 10 KW peak would be safe there. If you intend
>to drive a YC-156 that hard, be prepared to provide a lot of air (> 250
>CFM at > 2.5 inches of back pressure).
? 2.5 inches of cooling-air back pressure means a 3400-rpm blower And
that means lots of noise. However, with an 8171, a mere 0.5 inches of
back pressure is needed, which means a 1700-rpm blower will do the job,
and that means a lot less noise. Other niceties are greatly reduced
tuned-input complexity, and the 8171 drives direct with a 150w radio, so
no buffer-amplifier is needed. . The trade-off is building the LM723
ic/6N60 fet regulated screen supply.
- later, Joe
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
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