While we're on 3 cx800s, after some good advice I've decided to rebuild my old
Alpha 374 with just a single 3cx800, as I don't run more than 700 -800 watts
anyway.
I've worked out the mechanics and air system, but curious what folks would
suggest for the best value swamping resistor network ( or whether I'd be ok as
built) and recommended driving power, to stay below 30 mils grid current. I
can drive at any level easily.
Thanks, Scott
Make something good happen!
> On Aug 24, 2015, at 10:49 AM, Jim Brown <jim@audiosystemsgroup.com> wrote:
>
>> On Sun,8/23/2015 7:13 AM, Kevin Stover wrote:
>> The non-pulse rated 3cx800 max ratings are 2250V plate voltage, 0.6 plate
>> amps. Typical operation at 2200V and 0.5A with 23W of drive will get you
>> 750W AB2 output.
>
> That's close to how they run in Ten Tec Titan 425 amps -- using an N8LP
> LP100A to set output power to 1.5kW, I end up with about 50W drive on most
> bands.
>
> As has been noted, these tubes don't like too much grid dissipation. I keep
> the switchable meter in the Titans set to watch grid current, and try to stay
> below 60mA for the pair. That's about half of their rating. Achieving that
> means careful matching of the output stage to the load.
>
> 73, Jim K9YC
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