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CLEAN 3rd

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The clean channel step it is 3rd.
It has become the orthodox design, but, C13 is very puzzle. .
When using the clean channel, you think that MUTE it does with SW3.

R12	1.5k	Cathode bias resistance. Fender standard value
R13	100k	Plate load resistance. Fender standard value
R14	220k	With R15 and C13 forming LPF
R15	330k	With R14 and C13 forming LPF
VR5	500k	Master volume of clean channel
C11	22u	By-pass capacitor of cathode bias resistance
C12	0.022u	Condenser for connection. Fc=14.5Hz
C13	0.047u	When it tries calculating, puzzle the condenser. When it is this constant, Fc=10Hz it becomes and means strange thing. Puzzle.
SW3	*	When using the distortion channel, it probably is SW in order MUTE to do the clean channel.