Emerson-Radio-and-Phonograph-Corp-552 电路原理图.pdf

89 -0.5 37.5 MANUAL OF 1948 MOST-OFTEN-NEEDED RADIO DIAGRAMS PIN NUMBER TUBB | 1 | 2 | 3 12SA7 12SK7 12SQ7 *-0.7 *-1.6 50L6GT I 110 I 89 35Z5GT 116 The following voltage readings are d-c measurements talcen from B (line switch) to the indicated tube-socket pin. A 1000 ohms-per-volt meter should be used for all readings except those indicated by an asterisk (*), which should be taken with a d-c vacuum-tube voltmeter. Line voltage for these readings was 117 volts, 60 cycles, a.c. Take readings with the volume control set at minimum and the variable condenser dosed. EMERSON RADIO Cl, C2 900290 Two-gang variable condenser “1 MODELS: 525, 552 *C3, C4 Trimmers, part of variable condenser *C5 C6 ) , . CHASSIS MODEL: 120037 /to I I I Trimmers, part of i-f transformers I 310810 22,000 ohms, 54 watt resistor 397000 13 meg., 54 watt resistor 321330 3.3 meg., 54 watt resistor 390010 03 meg. volume control 321130 470,000 ohms, 54 watt resistor 340290 130 ohms, 54 watt resistor 321290 22. meg., % watt resistor 370490 1,000 ohms, 1 watt resistor 321030 220,000 ohms, 54 watt resistor 321210 1 meg., 54 watt resistor 340010 10 ohms, 54 watt resistor 340030 13 ohms, 54 watt resistor 180000 P.M. speaker 310130 Tone control switch 310390 Phono*radio switch Motor switch, part of record changer Line switch on volume control Cl, C2 *C3, C4 *C5, C6,) C7,C8 j C9 CIO Cll C12 C13, C14 C15 C16 C17, C19 C18 C20.C21 900290 Two-gang variable condenser Trimmers, part of variable condenser Trimmers, part of i-f transformers _ 910000 0.00022 mfd. mica condenser R1 920010 0.002 mfd., 600 volt condenser R2, R4 920515 0.002 mfd., 400 volt condenser R3 920240 0.0005 mfd., 600 volt condenser R5 920020 0.02 mfd., 400 volt condenser R6, R7 920040 0.1 mfd., 200 volt condenser R8 920050 0.2 mfd., 200 volt condenser (used R9 only when T1 and T2 are 720000 R10 and 720100 respectively) RU 920030 0.05 mfd., 400 volt condenser R12 922090 0.05 mfd., 400 volt condenser R13 (used up to serial No. 8,550,551), R14 or SP1 922101 0.05 mfd., 400 volt condenser (used SW1 after serial No. 8,550,551) SW2 925267 30-50 mfd., 150 volt dual electrolytic *SW3 IF. PEAKED AT 455 K C *eTV, 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