Ghirardi's
G-B res. and watt
Grid-bias resistor values e wattage 4 self biased
Ballast tubes
Data and RMA codes
Tube classification
Charts by use, structure, etc...
Tube characteristics
Operating and basing charts.
Subs
Tube substitutions charts
Pilot and dial lamps
Pilot, dial lamps charts.
RMA color codes
Caps, resistors and wiring RMA colors code.
