----- Original Message -----
From: "Brian Hill"
Newsgroups: alt.binaries.pictures.radio
Sent: Sunday, January 27, 2008 1:52 AM
Subject: marantz 250 amp early 70s



"Buck Frobisher" wrote in message
...

"Brian Hill" wrote in message
...

Here it is almost done.

--
Regards
B.H.
Hill Amplification
http://hillamplification.com

Brian's Radio Universe
http://webpages.charter.net/brianhill/500.htm


wow, looks like lots of work, despite the fairly open look of the various
boards. You had to completely take one out?



Yea I had to go over it all. The main failure was that a number of carbon
comp resistors went south in the HV circuits and the voltage went way up
frying a few transistors etc... So I replaced all the carbon comps and
most of the capacitors minus the mica types which all tested good. The
circuit boards are all very robust being about 3/16" thick with heavy
trace. It's a nice well designed amp. I rebuilt the power supply relay too
and hope it works? I give it the smoke test tomarrow!

BH

Good luck! that should last you for another 30-40 years...