Marshall TSL FX Loop Mod

We modify DSL amps all the time, moving the effects loop to before the master volumes, for better results with line level outboard gear.  However, this was not so simple with the TSL.  

We had to tap the FX loop pre tone stack in order to get a line level loop that worked for both the crunch and lead channels.  This required a high voltage loop in order to produce enough recovery gain.  So, we built a basic loop using high voltage FETs, using a separate small HT supply.

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