Hoffman-Radio-Corp-A300 电路原理图.pdf

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1、MANUAL OF 1948 MOST-OFTEN-NEEDED RADIO DIAGRAMS _ nuin DESCRIPTION HOFFMAN NO T T P P MODEL A300 - B1 1 1 D -fc A-W Wh _ ei-ei-CS Tbru.-Suction Variable 388-388-180 Mml.l MOO I I M % I I W W B f I I CHASSIS 100 C4.C5.C6 Trim-era; Ear* of Variable Conjaaaar | I % # 1 J 4-A. Al _ _ 7 8 05 Mfd, 200 Vei

2、t, Tubular Paper 4100 radio corp MODEL A300 CHASSIS 100 CHASSIS 100S Hoiiman Model A300 with Chassis number 100S is electrically identical with Chassis number 100 except ior I*6 Five-inch P.M. speaker, part number 9003, has been substituted for 4 x 6 inch oval dynamic speaker, part number 9000. 2. A

3、 1500-ohm resistor, part number 4701, has been con nected in the filter circuit in place of the 1500-ohm speaker *These changes have been incorporated in the schematic diagram shown below. SYMBOL | DESCRIPTION CI-C2-C3 Three-Section Variable (388-388-180 Mmf.) C4, C5. C6 Trimmers; Part ef Variable C

4、ondenser C7, C8 .05 Mfd, 200 Veit, Tubular Paper C9, C12, CIS, 05 100 Mmf 20%. Mica CIO, Cll .05 Mfd, 400 Veit, Tubular Paper 04, 06 .005 Mfd, 600 Veit, Tubular Paper 07 .01 Mfd. 600 Veit, Tubular Paper C18-O9-C20 Dry Electrolytic Condenser HOFFMAN NO 120-20-20 MM 450-450-25 Volt! .001 MM, 600 Volt,

5、 Tubular Papor .01 Mil 000 Volt Tubular Papor (Metal Caul Oscillator Coll 5 PM Loudspeaker .22 Megohm 20%, Va Watt 22,000 Ohm 20%, Vi Watt 2.2 Megohm 20%, A Watt 10,000 Ohm 10%, 2 Watt *7,000 Ohm 20%, Vi Watt .5 Megohm Potentiometer (Volume) 10 Megohm 20%. Vi Watt .47 Megohm 20%, Vi Watt 500 Ohm 10%

6、. Vi Watt .25 Megohm Potentiometer With Switch (Tone) *7 Ohm 20%. Vi Watt 550 Ohm 20%, Vi Watt 1500 Ohm 10%, 10 Watt, W.W. On-Off Switch (On Tone Control) Antenna Loop R.F. Coil (Shielded) Input I.F. Transformer (455 K.C.) Output I.F. Transformer (455 K.C.) PIN NO. 6SK7 (R.F.) 0 0 6SA7 0 0 6SK7 (I.F

7、.) 0 0 6SQ7 0 - 6K6GT/O 0 0 6X5GT/G 0 6 0 -.5 0 0 0 6.1A.C. 3 0 +227 0 0 + 217 290A.C. .5 + 85 .7 -.25 + 227 DC. voltages measured with 20,000 ohm/volt meter. A.C. voltages measured with 1,000 ohm/volt meter. All voltages measured with reference to chassis. Line voltage 117.5. _ CONVERTER -7 o 6.1A.

8、C. .7 0 + 85 6.1 A.C. +227 0 +95 6.1A.C. 0 0 + 325 6.1 A.C. +15 290A.C. _ 0_ +32S_ * Means tie point. NOTE: The above readings are obtained with no signal input to the receiver. 2ND. OET.-A.VC.-A.F. OUTPU7 SRSOT/G 119 VOLTS so-soCPS A.C. Ti RECTIFIER .sail “7%, ; S.IV, 2.7A TO #7 FILS. 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