Technics ST-3200 AM/FM Stereo Tuner Phase Locked Loop 76MHz/90MHz 1973

Description

Technics ST-3200 AM/FM Stereo Tuner Phase Locked Loop 76MHz/90MHz 1973
Description
FmAm stereo Tuner
Power is OK.
FM / AM tuner that improves sound quality from the pursuit of waveform transmission.
The FM4 series and AM2 series variable condensers are adopted as the front end part, and it is a single or multiple 3tuned circuit which sandwiches the RF stage which adopted the 4-pole MOS type FET. Moreover, the high frequency low noise transistor is used for the mixer stage and the local oscillator stage, and the aluminum core is adopted as the oscillation coil.
The IF stage makes the control system and signal system independent, and the signal system uses three 2-element group delay flat filters, and the control system uses one IC with three built-in differential stages and two L / C filters. I will. This has suppressed the occurrence of high-order distortion to the minimum and raised the selectivity.
In the MPX section, PLL (Phase Locked Loop) is adopted for the subcarrier oscillator, and the oscillation frequency and phase are always matched with the pilot signal to obtain a stable switching signal that is resistant to temperature fluctuations and aging. I will.
Moreover, the double differential switching circuit which has two main and sub circuits by a high density integrated IC composition is adopted as a switching.
The low-pass filter in the latter stage of the MPX part has acquired the characteristic of the phase delay time of 5.5μs at 15kHz.
The AF stage has a PNP-NPN 2-stage direct connection configuration using a low-noise transistor, and is driven by a regulated power supply.
The converter, IF 2-stage amplification, and 5tuned circuit are adopted as the AM tuner part.
In the power supply circuit, consideration is given to safety measures such as adopting temperature fusion protection elements for the primary and secondary fuses and the power transformer.
The MPX high blend switch is carried.
The strength center tuning meter is carried.
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