Been using the 4CX1600B at 1500 watts for several years for RTTY contesting
along with serving as net control for the Midwest RTTY Net every Thursday. No
trouble with the tube.
73,
Mike, K4GMH
"George T. Daughters" wrote:
> On 27 Nov 00, at 8:08, Bob Marston wrote:
>
> < snip >
>
> > The 4CX-1600B with the exception of the Austrailian Emtron design has not
> > seen it's way into commercial designs because Svetlana can not provide a
> > reliable deliver schedule for the tube.
>
> Ten-Tec and QRO now offer amps based on the 4cx1600b.
> Svetlana has, indeed, had difficulty with delivery. Maybe that's
> fixed now. I don't know.
>
> > George Daughters has built a
> > homebrew amp around this tube and his intial reports were good. He hasn't
> > said anything about how the amp has held up in ongoing service.
>
> Here's an update. The "Sunnyvale/St. Petersburg Kilowatt +" is
> still going strong. It's been very reliable. I tend NOT to run it with
> all controls fully clockwise. I probably average about 1300W out,
> and it doesn't get more than warm. I like cooooool components.
>
> I've fiddled a bit with electronic bias switching to minimize heat
> generation during zero signal conditions. I don't use it, because
> I've gotten comments like "It sounds like you're using heavy digital
> processing on your audio" and "You're not splattering, but your
> voice sounds unnatural." My decision not to use it is just an
> individual preference, not a condemnation of the technique. (The
> amp runs cool enough without it.)
>
> The amp is used heavily in most SSB and CW contests, so it gets
> more-than-average use. I've been using the same tube since I wrote
> the article.
>
> vy 73,
>
> George T. Daughters, K6GT
>
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