Kim:
The AX 9909s are hard to find and some people tell me they
don't last very long. That I can't attest to since my Globe
Champ has 8643s in the final.
The article on how to make the change from AX 9909s is in ER
some time back. If you need it, I can scan and email to
you. The article converts the AX 9909s to 5894s, which work
just fine.
I made the conversion with 5894s and switched to 8643 since
it has a higher plate voltage rating than the 5894. There
are other tubes that can be used, but I have never seen
them.
If I can help, email direct and I will give you any
information I have.
73
Jim/W5JO
If all goes well and I can get enough space cleared, I'm
going to set up my Dad's (W5JHJ) Globe Champion 350 and
Hammarlund HQ-170A in my shack, alongside my TenTec Orion
II. It has the original AX9909 finals and my Dad is the
original owner (purchased in 1959!).
I seldom see HQ-170As appear for sale and I can't think of
the last time I saw a Globe Champ 350 for sale, so I have
no idea what its value is; I'm guessing not much. Whatever
it is, I assume it's higher with the AX9909's. Still, I've
also seen some ideas about replacing the AX9909's with a
pair of 4-65's. I can't however, find those posts anymore.
Since the AX9909's are made of unobtainium, if they quit
and the spares have a problem, I'll have to perform this
mod. Are 4-65's more common? And, does anyone know the
details of that mod? If not the 4-65, what would I use?
Kim Elmore, N5OP
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