All American Five
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The term All American Five is a colloquial name for mass-produced, superheterodyne radio receivers that used five vacuum tubes in their design. These radio sets were designed to receive amplitude modu
The Philco PT-44 is an example of the All American Five radio set. This set deviates from the more usual AA5 in that it features an Octode mixer, though it still operates on the pentagrid principle.
Placard showing the tube placement. This set would have required an additional series resistor in the heater chain as the tube heater voltages do not sum to 115 volts.
Back view of the chassis. The compact design is aided by putting both IF transformers in a single can.
Five tube AM radio demonstrator of the single ended tube variant described below. Note "Do not ground" safety warning.
AC/DC receiver design
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An AC/DC receiver design is a style of power supply of vacuum tube radio or television receivers that eliminated the bulky and expensive AC-only mains transformer. Having no mains transformer, receive
An "All American Five" vacuum tube radio, a classic example of an AC/DC design.