[Boatanchors] Globe Champion 350A

[Glen Zook]

That is why many of the Globe Champion transmitters have been converted to 5894 tubes.  There was an article in Electric Radio several years back about doing this.  The subject transmitter was a Globe Champion 300, but the same conversion works on the 300, 300A, 350, and 350A.  There are no component changes, only a slight rewiring of the tube sockets and the plate connection has to be brought out to a dual plate cap which puts the 2 tetrode halves of the 5894 in parallel.  When the tetrode sections are run in parallel the effective specifications of the 5894 is, for all practical purposes, identical with the AX9909.

In my Globe Champion 350A, after I made the conversion, I get around 10 to 15 watts more output using the 5894 tubes instead of the original AX9909 tubes.  This is at the same input power.  I attribute this to the fact that the 5894 was designed for VHF and UHF operation and therefore are a little more efficient at HF.

Glen, K9STH

Website:  http://k9sth.com


--- On Sun, 1/9/11, Gary Pewitt <garypewitt at centurytel.net> wrote:

The output tubes are very rare and expensive.