[AMRadio] Globe Champion 350 & HQ-170A

Kim Elmore cw_de_n5op at sbcglobal.net
Mon May 14 08:40:49 EDT 2007

What Kent said!  Even my Dad has opined that the AX9909, while a 
physically pretty tube, seems to have found service only in the WRL 
Globe Champion. I can't find a data sheet on then, but I think 
they're good for something like 90 W of plate dissipation. I know 
that the final cage has a fan on it, and given that some think the 
tube seals might be a weak point, I'll make sure that fan is running.


Kim Elmore, N5OP

At 11:37 PM 5/13/2007, you wrote:
>Good question!  Does anyone know of ANYTHING else that used an AX9909?
>I wonder if Amperex built them for some military project that fell through
>and the whole lot got sold to WRL for a song?  Who else would want a tube
>that doesn't fit anything?
> > Why Leo Myerson's crew decided on these tubes
> > is un-beknownst to me.
>On Sunday 13 May 2007 05:57:00 pm Mike Sawyer wrote:
> > Jim said: The AX 9909s are hard to find and some people tell me they
> > don't last very long.
> >
> > Jim is correct IF you transmit prior to letting the AX9909's warm up. Why
> > Leo Myerson's crew decided on these tubes is un-beknownst to me. However,
> > I have been told that you need adequate warm up time, (roughly 5 min.) to
> > help maintain a seal around the pins. All of the pins, including the plate
> > come off of the bottom. I guess I ought to get a new low voltage
> > transformer so I can return mine to the air.
> > Mod-U-Lator,
> > Mike(y)
> > W3SLK
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