Output trafo wiring

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Output trafo wiring

Postby david glamour » Thu Mar 22, 2012 6:08 am

Hi everyone.
New in this forum and starting with a question. I´m actually repairing a 30 year old amp, a spanish brand called Sinmarc, a very fine copy of a Boogie Mk IIb. The thing is about the output trafo. The original was replaced some years ago and the new one looks like a Marshall type but I´m not sure that is wired in the right way. The amp is a 100 watts 2 x 12" combo powered by 4 x EL 34`s. The primary side has two holes in the cover. A red wire comes out from one of this holes an a white wire and a brown wire from the other one. The red and the brown goes to the plates of the tubes. The secondary side has another two holes. A blck wire comes out from one of this holes and goes to ground and from the other hole comes 3 wires: brown (4 ohm), yellow (8 ohm) and green. Last one was not attached and I guess is the 16 ohm winding, just because the amp has not a 16 ohm speaker out on the rear.
I must say that the trafo seems to work right, but I`d like to be sure, so any help will be very much appreciated.
You will find some pics in a folder attached. I hope that`ll be useful.
Thanks a lot.
david glamour
Posts: 2
Joined: Wed Mar 21, 2012 9:42 am


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Re: Output trafo wiring

Postby Brian Wallace » Thu Mar 22, 2012 10:01 am

Sounds like kinda C1998 Dagnall OT only the Brown is grounded and the Black is the 4 ohm tap.

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Re: Output trafo wiring

Postby david glamour » Fri Apr 13, 2012 6:42 am

Hey Brian.

I`ve been out for a time and I don`t have seen your post `til now. Thanks for the info and for your fast response.
david glamour
Posts: 2
Joined: Wed Mar 21, 2012 9:42 am

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