Majestic/Grigsby-Grunow Volume Control

[resnatron]

A friend asked me to take a look at a Majestic (Grigsby-Grunow) Model 60 for him. It is a nice, big floorstander on legs with a huge (read: HEAVY) clamshell chassis. I brought it up slowly on a Variac but got no sound at all. Replaced 13 caps (non-electrolytic) and now it plays pretty well.

Now for my question, there seems to be no volume control? There is a tuning shaft hooked to the capacitor (obviously) and another 3-step switch for "Audio something or another" That's it for user controls. On the schematic from Nostalgia Air there is a Volume Control indicated on the bottom of the inner part of the chassis, but no way to control it, that I can see. There is a mention in the schematic about "automatic volume control" but I can't see how it works.

Any insight? Are there old radios with no volume control? Any help would be greatly appreciated.

Thanks in advance.

Paul

[Chad Hauris]

Usually on the tuned radio frequency sets of the type used in the 20's, the volume is varied by varying the bias on the RF stages or on the really old ones by varying the filament voltage...usually there is no volume control in the audio circuit.
There is usually always some kind of control for volume though.