Download schematics for the 740 DC model.
Selector
RF Amplifier
Power converter
Speaker
Tubes
Service Notes
The chassis of the 740 and 750 models have identical chassis. These models the tuning selector unit with the additional 484 tube that is common to most Equasonne models.
The AC version is an 11 tube radio, the DC version is a 9 tube radio.
The RF amplifier unit of the 740 is of the 931 type and is common to virtually all Equasonne models.
The power convertor unit of the 740 AC differs from most Equasonnes in that it utilizes a pair of 281 half wave rectifier tubes as opposed to the more common use of a single full wave rectifier tube. This convertor was also used in models 301 and 750. As usual, the convertor houses the power output tubes, which are a pair of 250s in push pull.