High Power HF BA's?

Glen Zook gzook at YAHOO.COM
Sun Mar 30 11:54:01 EDT 2008

The 8072 is exactly the same tube as the 8122 except
that it does not have the colling fin assembly
attached.  The tube was most often used in UHF
commercial two-way FM transmitters where the plate
tuning assembly aided in conducting the heat.  In most
of those applications there was a blower assembly that
moved air through the entire system for cooling

The basic specifications of the 8072 include
considerably less plate dissipation than the 8122
because of the lack of cooling fins.  However, the
effect of the plate tuning assembly in the commercial
FM units generally increased the abiility of the plate
to dissipate more heat.

Glen, K9STH

--- Mark Shaum <k9tr at DTNSPEED.NET> wrote:

I have a couple conduction-cooled tetrodes (8072 I
think) that are small enough to shoehorn one into the
final cage of a sweep tube rig and  will run well at
the usuall 600-800V B+ on hand.  Finding room for a
heatsink/fan assembly and all the redoing of
mechanical layout, neutralization and such makes this
an imposing task.  I'm not familiar with the GI-7B but
any swap of finals with something of differing
mechanical and electrical characteristics is going to
be a chore.

Glen, K9STH

Website:  http://k9sth.com

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