RCA-Victor-Co-Inc-RS-157D 电路原理图.pdf

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1、VOLUME R-19, MOST-OFTEN-NEEDED 1959 RADIO SERVICING INFORMATION rca Victor Model HF-99 Chassis No. RS-157D The record changer has a dual control on the motorboard and a stylus selector control on the pickup arm. The metal lever of the dual control is the OFF-ON-REJECT control. Turn ing this lever to

2、 the center position energizes the motor and starts the turntable; when turned to the clockwise position it starts the mechanism into complete automatic operation. The mechanism will shut off automatically after the last record has been played but can be shut off manually by turning this lever count

3、er-clockwise. The circular knob of the dual control is the speed control. It has four positions; ”16, ”33, ”45, ”78, to select the turntable speed desired and a neutral (N) position. Record Changer Controls CRITICAL LEAD DRESS AC POWER TO RECORD CHANGER H 115V. 60/v POWER SUPPLY ifh OUTPUT TRANS. tr

4、eble TONE CONT. AUDIO INPUT FROM RECORD CHANGER /viN 9 12AX7 /v5 OUTPUT W /V4 35W4 BASS TONE CONT. AMPL. a PH. INV. /vjS 35C? OUTPUT View of Amplifier Chassis Showing Location of Tubes and Major Components 1. Dress all heater leads and power cord close to chassis and away from 12AX7 tube socket and

5、phono input jack to maintain low hum level. 2. Keep shielded lead Wl, including shield connections, as short as possible. 3. Dress record changer power cable and pickup cable as far apart as possible to minimize hum pickup. NOTEThe ON-OFF switch is not part of the volume con trol. The record changer must be ON for power to be apphed to the amplifier. 125 收音机爱 好者资料库 RadioFans.CN