I am running through the voltages on the tube sockets per the HQ-180 Table 1. Tube Socket Voltages and on V18 ( IF Gate) pins 6 & 7 it lists two values and IMC in parentheses'. I have two versions of the manual and both have the same IMC designation. Can someone explain? Is it a typo for 1 MC? Thanks as usual for all the help! Ron K3PID