Westinghouse-Electric-Corp-V-2500-1 电路原理图.pdf

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1、VOLUME R-18, MOST-OFTEN-NEEDED 1958 RADIO SERVICING INFORMATION Westinghouse Models HF100BN, HF101BN, Chassis V-2500-1 CIRCUIT INFORMATION The V 2500-1 amplifier circuit, used in models HF100BN and HF101BN, is shown in figure 2. An audio signal of about .1 volts is amplified to about 6 watts through

2、 a straightforward amplifier circuit. A 12AX7 serves as audio amplifier and phase inverter to drive the 6V6 push-pull output tubes. This output stage is operated class ABi. Degeneration, for improved fidelity, is obtained through the use of unbypassed cathode resistors and the inverse feed back loop

3、 through R116. A 2.7 ohm resister is used in series with the 6AU6 heater to reduce hum. The impedance of each speaker voice coil is 12.8 ohms. If a replacement speaker is required, use the correct Westing- house replacement speaker listed in the parts iist. When operating the amplifier with speakers

4、 disconnected (during tests), connect four 50 ohm, 2 watt resistors in parallel across output terminals 2 and 4. The function of C107 is to pass only high frequencies to the parallel high frequency speakers. AC input (to the power transformer primary) is connected to 1 and 3 of the socket, SO 100; t

5、he AC on-off switch is located on the record changer. VOLTAGE GAIN MEASUREMENTS An audio signal generator and VTVM are required for voltage gain measure ments, To measure over-all amplifier gain, proceed as follows: 1) Discon nect speaker. Connect four 50 ohm, 2 watt resistors in parallel across ter

6、minals 2 and 4. 2) Set loudness control, R102, to maximum loudness. 3) Set bass control, R107, and treble control, R110, to mid-range. 4) Con nect generator output to J100, Set generator for lKc, at about .7 volts output. 5) Connect VTVM across out put terminals 2 and 4. Approximate correct voltage reading is 8 volts. I2AX7 AUOO AM* AND PHASE MVCRTCR EM ASK . 2ip0_ _X0 lloc !-T-X J I T?f *4?0* ;2 a BGCT. |C0 6 PL lOO (MPT OP ACCORD CHANGER! 6V6GT 6V6GT 2 AX 7 172 收音机爱 好者资料库 RadioFans.CN