The electronic circuit is a dual Superhet designed to operate into an amplifier adjusted for acoustically flat response.
Full range bass and treble controls make it possible to diminish or augment any major portion of the audible scale allowing for an unsurpassed flexibility of tone pattern (Fig. 1.)

SR28FAM embodies such features as tuned Infinite Impedance type AM detection.
Electron ray tuning indicator as a visual tuning aid. Complete shielding for the elimination of strays.
Input jacks for Magnetic phono pickup, Crystal pickup, and TV audio channel on selector Control Switch.

Average output:. 4 volts.
Licensed under patents of Hazeltine Laboratories, Inc., and others.

6BE6; 6C4, 6AL5, 6SL7GT,

Tubes: 3, 6BAb; I each 6SA7, 6SK7, 6E5, 6X5.

Power Consumption: 50 watts, 110-125 volts, 50-60 cycles.

CAUTION
VENTILATION IS EXTREMELY IMPORTANT.
No multi-tube unit should be housed in an insufficiently ventilated cabinet. Damage to the unit and the cabinet will result.

USE ONLY 1 AMP. FUSE.

ANTENNA REQUIREMENTS
For best non-directional standard AM broadcast results a single wire five to ten feet in length connected to antenna terminal " A " will be sufficient. Additional selectivity to this efficient input circuit would tend to restrict the wide band reception capabilities of the Infinite Impedance type detector.
For best FM results a 100 N.C. dipole should be in a talled well above surrounding obstructions. The trusted 300 ohm line from the dipole should be connected to antenna terminals " D " and " G ". (" G " also grounds unit.)
A console type folded dipole is supplied with the turer And will prove a satisfactory substitute in cost cases where an external dipole is impractical.

INPUT JACKS.
All phono or TV aud in signals as well as the AM and FM radio are subject to the volume and tone controls of the tuner.

The jack marked MAG is the phono input for the new variable reluctance cartridge with its properly compensated pre-amplifier,
XTAL 13 the phono input for a standard crystal pickup.
The TV jack makes it possible to channel the audio of a television cuner thru the radio's amplifier and speaker.
The OUTPUT jack should be connected to the high impedance input control (250,000 to 500,000 ohms) of a quality audio amplifier. Use the prepared shielded lead gupplied with the tuner. Choose a speaker capable of wide range reproduction, A.C.POWER. SR28FA is completely powerized for 110-125 volts 50-60 cycles. The power switch (on the volume Control) also controls the A.C. receptacle on the back of the chassis for convenience in amplifier installation,