Chris6870
Well-known member
On the Mark IV you can add gain in a lot more ways than turning the gain knob to 10. The treble knob adds gain. Most in the know run treble at least on 7, having the rocker switched to Mid Gain adds gain,running the mid and presence higher helps add gain and then you can fine tune all that with the GEQ.
I set mine real close to Danyeo's pic. If you set it like that and it has the gain of a JCM 800 it might need service. Also make sure you set the switches in the back to Pentode and Simulcalss and run full power for maximum gain.
I set mine real close to Danyeo's pic. If you set it like that and it has the gain of a JCM 800 it might need service. Also make sure you set the switches in the back to Pentode and Simulcalss and run full power for maximum gain.


