Mark IIC+ Effects Loop
To have the definitive proof that an amp is in fact a IIC+ claim, one must first ascertain the above, but to prove beyond a doubt, there is a simple effects loop play test.
1) Plug your guitar into the fx return with the amp in LEAD mode.
2) Play a chord and let it ring out.
3) While it is ringing out, adjust the lead drive pot.
If there is a change in sound as you adjust that lead drive control - it is NOT a C+, it must be a Mark IIC. Reason is because the lead voice was placed entirely in the pre amp section in the C+ whereas the original C had some shaping after the pre amp which is why that lead drive would effect the sound when you plug your guitar into the fx return (bypassing the pre amp section).
