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.
73,
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?
Kent/KA5MIR
> 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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