What is stereo?

There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.

H.H. Scott '59

Heathkit AJ-41

 Heathkit AJ-41 Tuner has many interesting features, some of which are quite unique. The Tuner will receive monophonic AM or FM , or stereo FM. Individual meters monitor AM and FM tuning, a neon lamp is incorporated to indicate when a FM stereo signal is received. Another feature is a FM squelch circuit, which eliminates between station noise when tuning across the FM band. Cathode follower output stages provide low line impedance to avoid hum and high frequency losses in the interconnecting audio cables. With a FM stereo output, the cathode followers perform separately as left and right channel output stages; on monophonic AM or FM, the two output stages are tied together and supply the same information to both the left and right channel amplifiers of a stereo system.
 Deluxe Heahtkit "Tube-Type" AM/FM and FM stereo Tuner
Built-in FM multiplex adapter
Broad-band circuitry for full fidelity
Automatic FM Stereo indicator light
Adjustable Automatic Frequency Control for drift-free reception
Stereo phase control for maximum separation and lowest distortion
Adjustable FM squelch circuit for low noise between stations
Preassembled tuning unit, prealigned coils

Deluxe Features For Deluxe Performance. Compare the price and features of this renowned Heathkit Stereo tuner. Here is deluxe styling with luggagetan vinyl-clad steel cabinet, polished anodized trim, and refracted lighting of the big slide-rule dial, matches the Heathkit AA-100 amplifier.
Here are convenience features for easy operation, finer performance. Just flip a switch and chose FM, FM stereo,or AM listening. In addition there's an automatic stereo indicator light, built-in stereo adapter, automatic frequency control for clear, drift-free reception, adjustable FM squelch to assure complete silence while tuning, and a stereo phase control for maximum station separation, minimum distortion.
 Heavy die-cast flywheels are used on the tuning controls to give smooth tuning action. A "unitized" chasis design provides for rigidity and ease of kit assembly before being incorporated into the final assembly.
Control versatility is essential to good performance from a high quality tuner. All controls are arranged to offer maximum versatility without an excessive number of knobs.
Completely separate circuits are used for the AM and FM portions of the Tuner to avoid compromising performance. The multiplex circuit is used only in the Stereo position of the Mode Selector switch. Silicon diode rectifiers are used in the power supply because of their long life, dependability, and the fact that essentially no heat is generated in this type of rectifier. A choke is used in conjunction with the silicon rectifiers to improve regulation and to minimize hum. The heavy duty, electrostatically-shielded power transformer isolates the circuitry from the power line.

For Added Convenience - there are individual AM and FM tuning meters, flywheel tuning action, built-in antennas plus external antenna connectors, a fidelity switch for normal or maximum AM fidelity; and a preassembled, prealigned front-end to insure professional performance.  Assembly takes just a couple of evenings.
FM Section
Tuning Range:  88 - 108 MHz
Intermediate Frequency (IF):  10,7 MHz
Antenna:  300 Ω balanced
Output Impedance (Cathode Follower):  variable to 4000 Ω
Output Voltage:  Nominal, 0,5 volt with 3 µV, (30% modulation in)
Quieting Sensitivity:
2 µV for 20 dB of quieting;
3 µV for 30 dB of quieting
20 µV for full quieting, 40 dB
Audio Frequency Response:  20 - 20,000 Hz, ±2 dB
Maximum Deviation Sensitivity:  5 µV, 400 Hz 100% modulation in,
Deviation Sensitivity:  20 kHz (1100 µV in)
Harmonic Distortion:  less than 1% (1100 µV, 400 Hz 100% modulation)
Intermodulation Distortion:  lesss than 1%
Image Ratio:  40 dB
Capture Ratio:  12 dB
AFC Correction Factor:  12 dB
Amplitude Modulation Suppression:  25 dB
Hum and Noise:  40 dB below 30% mod. (20 µV in)
FM Stereo Converter Section
Audio Frequency Response:  50 - 15,000 Hz ±2 dB
Subcarrier Bandpass:  23,000 - 53,000 Hz ±3 dB
Channel Separation:  30 dB at 1 kHz; 25 dB at 10 kHz
Hum and Noise:  -55 dB relative to 1 volt RMS output
Output Impedannce (Cathode Follower):  variable to 4000 Ω, each channel
Outputs:  Left - Right channel
AM Section
Tuning Range:  535 - 1620 kHz
Sensitivity, Normal Position: 
at 1400 kHz : 3 µV
at 1000 kHz :  4 µV
 at 600 kHz :  8 µV
Sensitivity Change, Normal to Maximum:  -5 dB
Intermediate Frequency (IF):  455 kHz
Antenna:  Built-in rod, with provisions fro external straight wire)
Output Impedance (Cathode Follower):  variable to 4000 Ω
Output Voltage:  Nominal 3 volt
IF Band Width: 
Normal :  14 kHz (6 dB down)
Maximum :  20 kHz (6 dB down)
Image Ratio:  1400 kHz (50 dB);  600 kHz (75 dB)
Harmonic Distortion:  less than 1%
Hum and Noise: 35 dB below 30% modultion (1000 kHz with 100 µV in)
IF Rejection Ratio:  1400 kHz (42 dB);  600 kHz (38 dB)
10 kHz Rejection:  40 dB
Tube Complement:  5 x 6AU6; 2 x 6BA6; 1 x 6BS8 or 6BZ7; 1 x 6AB4; 2 x 12AT7; 1 x 6AL5; 1 x 6BE6; 2 x 12AU7; 1 x 12BH7
Power Supply:  Transformer-operated, silicon rectifiers.
Power Requiremants:  117 V, 50/60 kHz
Power Consumption:  100 watts
Dimensions (H x W x D):
Overall :  5-1/4" x 15-1/2" x 14-1/4"
Panel Mouting :  4-1/4" x 14-1/2" (Cutout); 12-7/8" (Depth)
Weight [net/shipping]:  18,5 lbs / 22 lbs

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