How can you determine if a Mark II is a Mark IIC+?
We began building Mark IIC+ amps at approximately serial Number 12500 and there were roughly 2500 original IIC+ amps made. However, many owners of earlier Mark II models had their amps converted to a IIC+. So, how do you know if a Mark II in your possession is a IIC+ or has been modified to be a IIC+? Try the Loop Test...
The Loop Test
- Plug your guitar into the Effects Return jack using an instrument cable
- Switch the amplifier to Lead mode
- Play a note, let it ring and then rotate the Lead Drive and Gain controls
- If these controls have NO effect on the volume and sound you have a IIC+