Emerson-Radio-and-Phonograph-Corp-508 电路原理图.pdf

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1、MANUAL OF 1946 MOST POPULAR SERVICE DIAGRAMS rwrnr/NL.1 n i rM/ BATTERIES MUST BE LOCATED EXACTLY AS ILLUSTRATED EMERSON RADIO *bu battery MODEL: 508 A BATTERY METAL TIP ON CHASSIS MODEL: 120008 TYPE OF TUBES: 11R5, oscillator-modulator 11T4, i-f amplifier 11S5, 2nd detector, a.v.c., a-f amplifier 1

2、3S4, pentode output POWER SUPPLY: “A” and “B” batteries. VOLTAGE RATING: “A” Battery1.5 volts *B” Battery67.5 volts CURRENT DRAIN: “A” Battery0.25 amp. “B” Battery0.0075 amp. I HU OUTPUT TRANSFORMER MOUNTED ON CHASSIS JciOftB + FILAMENTS +Ti VOLT + 6T /z VOLT B BATTERY DOOR SWITCH SHOWN I IN Ton* PO

3、SITION Cl, C2 Variable condenser, or.-*r Cl, C2 Variable condenser _._._ C3, C4 Trimmers, part of Cl, C2- C5, C9, C14 0-02 mfd., 100 V. roll-type condenser._ C6, C7 Trimmers, part of T2_ C8 0.0002 mfcL mica condenser, or._ C8 0.0002 mfd. ceramic condenser._ CIO 8 mfd., 100 V. dry electrolytic conden

4、ser. Cll, C17 0.003 mfd., 150 V. roll-type condenser_ Cl2 Condenser, part of T3_ 03, Cl5 0.0001 mfd., ceramic condenser._ 06 0.001 mfd., 100 V. flat roll-type condenser LI Loop assembly _ R1 100,000 ohms, $4 watt resistor.- R2 10,000 ohms, M watt resistor._ R3 3.3 meg., M watt resistor_ R4, R7 1 meg

5、., M watt resistor.- R5 Volume control . R6 0.47 meg., M watt resistor._ R8 4.7 meg., watt resistor._ R9 10 meg., M watt resistor._ Location of Coils and Trimmer Adjustments The first i-f transformer (T2) is located next to the output transformer (T4). The trimmers (C6, C7) are accessible through ho

6、les in the top of the can. The second i-f transformer (T3) is located between the 1T4 and 1S5 tubes. The single trimming core screw (02) extends from the end of the can. The oscillator coil (Tl) is located next to the first i-f trans former. The trimmer for the oscillator (C4) is located on the smal

7、ler variable condenser section. The 600 kc oscillator core adjustment is the brass screw protruding from the end of the oscillator coil. The loop antenna acts as the antenna coil. The trimmer for the loop (C3) is located on the larger section of the variable condenser. Voltages marked (*) are taken with, vacuum-tube voltmeter COMPILED BY M. N. BEITMAN, SUPREME PUBLICATIONS 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN