Strange transformer issue in a Morgan Jones tube amp
Jun 22, 2002 at 6:08 PM Thread Starter Post #1 of 1

sirion

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Just finished wiring my morgan jones, and I'm getting some strange results, mostly in my multimeter.

Sound is fine, except for a persistant buzz, which I'm assuming may be related to:

Only getting 150VDC out of my power supply. 18.6VAC is going in. ~140VAC is coming out of my transformers.

My transformers are labelled as follows:

"F-25X
Filament Transformer

PRI. 115V 60HZ.
BLACK LEADS
FIL. -- 12.6V.CT.@1.5A
BLUE-YEL-BLUE"


As is, they're wired together as follows(Numbers correspondto transformers 1 and 2)

Blue leads:
1a<--->2a
1b-->Power supply+
2b-->Power supply-

Black Leads:
1a<-->2a
1b-->Rectifier
2b-->Rectifier

Yellow leads are not being used (In little isolated sheaths)

I've tried just dumping the whole 18V into one of the transformers, and I'm getting the same numbers out of it(140VAC).

Any ideas?

(The circuit is the top one over here:
http://headwize.powerpill.org/images4/cmoy5_1f.gif
 

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