[AMRadio] Globe Champion

[Donald Chester]

>From: "Jeffrey J. May" <jeffreymay at worldnet.att.net>

> > According  to the WRL  add in QST April 1950 it is a Champ175... > 175 
>watts input on 10  through 75 meters......That  was the year  that the 
>Globe King 275  was
> > replaced  by  the  King 400....I  have  the 275  with a pair
> > of  V70D's  Modulated  by  4 6L6's...
> >
> > Best  73's   Bob K1JNN/5

Interesting.  There were more varieties of those old Globe rigs than I 
thought.  I built an exciter from the carcass of a Globe 175.  Still use the 
812 stage more or less intact.  The rig will work well on 160 if you obtain 
coils for it, despite the low value of plate tank capacitance in the 812 
stage.  It was also originally modulated with a quad of 6L6's.  Looks like 
the Globe King 275 may have used the same modulator.  The 400 sounds like it 
has the same rf final, but with a more scroteful modulator (5514's).  I 
wonder if Globe used any larger rf components when they went to the 400.

The old Champ 175 was largely gutted when I got it, so I reconstructed it 
with the following mods:  6AG7 - 807 - 812A.  I eliminated the link coupling 
between driver and final, converting to capacity coupling with a single 
tuned circuit (one less coil and tuning control).  I use a screen pot in the 
807 stage to adjust grid drive.  Relocated a lot of the components and redid 
the bias supply.  I rebuilt the rig in about 1963 and used it to drive a 
304-TL.  Resurrected it a few years ago to drive a pair of 8005's.  It 
drives that final with little more than idling current on the 812 - about 30 
mills plate current.  It works FB in this service with the most crapped-out 
812 I could find.
I replaced the original front panel with plain black crackle, and installed 
a pair of round Weston 301 meters, one for the multimeter  function and the 
other for 812 plate current.  Don't know what ever happened to the original 
front panel, but I recall it was pretty well dinged up when I was given the 
rig for hauling away.

Don K4KYV

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