takin'bout guitar amp schematics

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It is the [ehuekutosendo] circuit.
Impedance is lowered with [kasodohuoroa].
As for [kasodohuoroa] there is some type in method of giving the bias, but, this type is general.
Actually before being output, it is the expectation which is volume adjustment and the like, but, the circuit is unclear.

R37 1M Resistance for grid bias. If 12AX7 you think that 1M may think standard.

R38 470 Resistance for cathode bias. Just a little, but value of the small awakening, perhaps we would like to let flow electric current sufficiently. Intention is unclear

R39 22k The resistance which is necessary to the case of the cathode follower. Unless there is this, the dynamic range cannot come off. Speaking conversely, the dynamic range is adjusted by this resistance

C31 0.022u Coupling capacitor of input. In case of [kasodohuoroa] because the grid does not become 0V, necessity

C32 2.2u Coupling capacitor of output side. Because impedance is low, big value is used. When [kasodohuoroa] is formed with 12AX7, output impedance becomes 1k weakness

SW15 * Selector switch of clean channel and overdrive channel

R37	1M	Resistance for grid bias. If 12AX7 you think that 1M may think standard.
R38	470	Resistance for cathode bias. Just a little, but value of the small awakening, perhaps we would like to let flow electric current sufficiently. Intention is unclear
R39	22k	The resistance which is necessary to the case of the cathode follower. Unless there is this, the dynamic range cannot come off. Speaking conversely, the dynamic range is adjusted by this resistance
C31	0.022u	Coupling capacitor of input. In case of [kasodohuoroa] because the grid does not become 0V, necessity
C32	2.2u	Coupling capacitor of output side. Because impedance is low, big value is used. When [kasodohuoroa] is formed with 12AX7, output impedance becomes 1k weakness
SW15	*	Selector switch of clean channel and overdrive channel