[AMRadio] Globe Champion

[Sara & Wayne Steiner]

Re the GK275

I also have a GK275 which I found about 15 years ago and just renovated it
about two years ago, Actually it is kind of a hybrid or mixed up GK. It has
a 275 rf deck and an early 500 mod deck.  When I found it, it was in the
middle of a modification with a 5 prong socket where the 2E26 goes and an
807 in it's place and a bunch of wires hanging loose.  After determining it
was a 275, I put it all back orig. as a 275.

Here are my problems. I don't think the 2E26 has enough power  although it
works ok on 75.  I see why the upgrade to an 807,really no problem here.
The real problem is instability.  After neutralizing , all it takes is a
bump on the table , lift the lid, close the lid, BREATH on it, and it takes
off like a shot. I have neutralized other P-P amps and have never had this
much trouble.  I notice that this early GK275 has a skimpy grid coil shield
(does not wrap around the coil).  There is a line of sight between the neut.
caps and the coil.  I don't see this skimpy shield on other V70-D GKs. I
think I'll experiment with a bigger shield when  get some other projects out
of the way.

Anyone have any ideas on this.  Brian's post kind of hit home on this.

73
Wayne, N0TE