Re: M3 progress report

[Wim Rijnsburger <rijnsburger@ecn.nl>]

Hello Jim,

I think you need to find a manual first. I have one, but
I think you can find one more closer to where you live. If
not I can fax the schematics to you.

Here are some suggestions.

First verify if there are high voltages on the tube (anode)
connections. Without schematics, simply try here and
there.... (not with your fingers:-)

Pull out the LSP plug and measure the resistance between
the leads to the speaker. The plug has 4 leads, one pair
for the voice coil and another pair for the field coil.
This check will tell you a lot, because the field coil of
the M3's internal speaker acts as a choke in the high
voltage power supply. If the field coil is burnt out or
not connected, the amplifier don't get its high voltages.

If you don't have a LSP with 4 leads, then it could be
replaced by a modern LSP with permanent magnet. In that
case there is a real BIG and usually very HOT resistance
in the amp that replaces the field coil. This resistance
could be burnt out.

Now for the moral: take you time, don't be hasty, stop
regularly and think everything over and over again and...
keep asking what you don't understand, don't think that
you are more stupid than anybody else! We all on this
list - even the ones with engineering degrees - have
learned NOTHING about this smelling beauty on school. For
me is "Monkey see, monkey do" a main learning principle.

Hope this helps.

W.
-- 
Wim Rijnsburger <rijnsburger@ecn.nl>
Netherlands Energy Research Foundation, ECN
P.O. Box 1, 1755 ZG  Petten, Holland
phone: +31 224 564097   fax: +31 224 561407