[Johnson] Tube Designation

[Peter Markavage]

I seem to remember when I had the 12AT7's in the Heath SB-10, I had to
constantly ride the carrier null pots with each transmission. Replacing
the tubes with 6201's and replacing the null pots with 10 turn devices
cured that problem along with the improved carrier suppression.

Pete, wa2cwa
http://www.manualman.com

On Tue, 22 Apr 2008 13:21:19 -0400 "David C. Hallam"
<dhallam at rapidsys.com> writes:
> Pete,
> 
> I can't seem anything one way or the other.  Right now the Pacemaker 
> is a
> work in progress.  When I am finished refurbishing maybe I will run 
> some
> tests.  I can try a 12AT7, ECC-81, 6201, and any other MilSpec 
> variants I
> can get my hands on and look the carrier and side band suppression 
> on my
> spectrum analyzer.
> 
> David
> KC2JD/4