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Old 4th May 2011, 08:31 PM   #1
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Join Date: May 2011
Default JTM30 output transformer


I have just bought a Hammond 1750NA output transformer as a direct replacement for my Marshall JTM30. Does anyone which colour wires connect where as the transformers differ in appearance??????

Last edited by wrightyk6; 4th May 2011 at 08:38 PM.
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Old 4th May 2011, 08:45 PM   #2
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Alastair E's Avatar
Join Date: Feb 2004
Location: South Wales
What does the maker's website say or the info that came with the Tx...?
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Old 4th May 2011, 08:50 PM   #3
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Originally Posted by Alastair E View Post
What does the maker's website say or the info that came with the Tx...?
the 1750NA is a new product & therefore no info on the website. I have emailed them but no reply so far
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Old 4th May 2011, 10:34 PM   #4
Matt BH is offline Matt BH  United Kingdom
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Join Date: Jul 2009
Location: Cheltenham
Hello wrightyk6,
Hammonds usual wiring scheme is:

Blue and Brown- Anodes
Blue/Yellow and Brown/Yellow- Screens for UL connection, I guess you dont have or need these.
Red- HT

As for the secondary I have no idea as Hammond have decided on some easy wire thing lately, which actually makes them less usefull for people that like to mis-wire them.

Hope this helps.

Cheers Matt.
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