1) Every now and then, keep an eye on the Balance settings by flicking the BAL switch to the left side:
2) Then compare it with the BAL on the right side :
What the meter reads doesn’t matter at all, but you must make sure that both BAL readings are the same.
To do so, adjust the BAL preset with a screwdriver as you repeat step 1) and 2). And keep doing it until readings are the same.
You will notice that when you turn the preset in one direction to increase the meter reading in 1) it will decrease the reading in 2) at the same time, so just keep flicking from one side to the other adjusting the preset in the right direction until you achieve the same reading on the BAL positions.
Once you have finished to adjust them flick the switch back to ZERO for normal gain reduction reading and do the other channel.
All tubes in a FAIRCHILD should be well matched.
I would always expect the BAL preset setting to be between 9 O’clock and 3 O’clock maximum.
Do not run Your FAIRCHILD with any of the BAL presets almost all the way up or down on one side, please contact me first to arrange to re-measure all your tubes and check them, something is wrong and not balanced properly, and you are probably risking damaging more tubes or output transformers.