The 3 channel tube preamp section of my Bristol Audio Devices "The Machine" combo guitar amplifier.
The preamp has 3 unique preamp styles,
- A Fender Blackface Channel
- A Marshall Plexi Channel
- A Mesa Boogie Mark 1 Channel
The channel selection is straightforward.
One switch to choose between clean Blackface or Distorted Channel.
A second switch selects between which of the 2 distorted channels is selected
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