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- Fri Jun 28, 2013 3:17 pm
- Forum: Technical Discussion
- Topic: Marshall pre PI MV to Post PI
- Replies: 15
- Views: 5373
Re: Marshall pre PI MV to Post PI
HOW DO i change A master volume Marshalls from pre PI master to post PI master. everyone here says its easy ,I dont knkow where the phase invertor tube is - I'm not an Amp builder just on that quest for Tone -, my amp MArshall Jtm 30 ,whats the first thing I do ? does it requier Physically adding an...