Transformer codes
The initial goal of this page was to help identify the transformer codes used in
JTM45 and JMP50 amplifiers and how they overlapped over the years.
This goal has grown into what I call the Historic Data Base page.
This page contains information on the external and internal components used
in the JTM45 and JMP50 amplifiers from the 60's through the 80's.
If you have any comments, questions or would like to contribute
to this page
please email me @ Info@Marstran.com
Marstran / Wallace amplification forum
Transformers currently in stock
Updated 1/03/09
TW output transformers $75.
Ten in stock.
TW power transformers with export taps. $120.
JTM45-style Board for Projects/Reissues
Current Transformer Code Information
Historic Data Base
172 amps and growing
Marshall Historic Pictorial Page
Page updated 12/29/08