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Title: Note for kit builders Post by: hywelg on April 24, 2008, 08:59:47 PM Just found out that on my OT the red is NOT the centre tap on my tranny. I had read the reports of the blue and brown being reversed and my amp tech told me that red for centre tap is standard in Fender and Marshall OT trannies. I had completed the build and gave it to my amp tech to test and he found a problem which he thought was the OT being faulty. Nik suggested measureing the resistances red-blue-brown-red and sure enough red was NOT centre.
Easy if you know to check and kit builders should be made aware of it I think. I just hope that the secondaries are correctly colour coded as per layout drawing. Title: Re: Note for kit builders Post by: fred on April 25, 2008, 05:30:06 PM Its a very handy test that i will never forget, and it seems so obvious! just goes to show that you shouldn't just copy the diagrams.
Title: Re: Note for kit builders Post by: hywelg on April 25, 2008, 06:51:49 PM Nik did admit that my transformer is wrongly colour coded and it does happed occasionally and that his transformer manufacturer will get a slap!
Title: Re: Note for kit builders Post by: fred on April 26, 2008, 09:53:58 AM mine seems fine, I assume that the 2 wires with the greatest resistance will leave the other wire to be the centre tap. In which case, it is the red wire on mine.
Title: Re: Note for kit builders Post by: hywelg on April 26, 2008, 05:31:13 PM If yours is centre tap red then
red-blue = red-brown = (blue-brown)/2 |