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
Check out the Wallace BKW45 in the
May issue of Premier
Guitar magazine.
Marstran / Wallace amplification forum
Transformers currently in stock
Updated 1/27/12
Trainwreck express output transformers $75.
Three in stock.
Trainwreck power transformers with export taps. $120.
Five in stock.
Current Transformer Code Information
Historic Data Base
178 amps and growing
Marshall Historic Pictorial Page
Page updated 5/21/10