On Sun, 21 May 2006 09:16:28 -0500, "g. beat" @spam protected
wrote:

"JC" wrote in message
.com...
Hi Group,

snip
So does anyone have a better set of drawings to see if their MLA-2500
PI-Net parts match the drawings?

Regards,
Jim
WD5JKO
Jim -

For reference purposes, here are the Communication Quarterly and KU7G
articles (Adobe Acrobat)
regarding 4CX400a or 4CX800a conversions
http://www.tomstubes.com/images/mla_2500_4cx400a.pdf

KU7G
http://www.tomstubes.com/images/mla2500_4cx800a.pdf

I would suggest an alternate chimney though using Silastic rubber
sheet wound into a tube shape as is done in the Alpha series amps.
Relatively inexpensive, no machining, and easy to install.

One other comment. The MLA 2500 suffers from poor voltage regulation
as did most of the Dentron amps. It does after all use a doubler in
the power supply. So when tuning be sure to use the "tune" position
and then switch to operate. Tuning in the operate position drags the
plate voltage down so far that the amp will not be properly tuned for
the PEP on SSB. With my voice characteristics and under the old rules
of 1 KW average input mine would put out about 2200 PEP.

Good Luck,

Roger Halstead (K8RI & ARRL life member)
(N833R, S# CD-2 Worlds oldest Debonair)
www.rogerhalstead.com


Roger Halstead (K8RI & ARRL life member)
(N833R, S# CD-2 Worlds oldest Debonair)
www.rogerhalstead.com

w9gb