Univox_U235PB 电路图 维修原理图.pdf

400MA 0V 90V 250V 50-60 150V 80-100 350V (400V Surge) V5V4V3V2V1 8V BA9S BLU BLU 6.3V 3A 100V ON OFF STANDBY ON OFF STANDBY 50V 10K33K 10 50V 0.005 400V 2A SB 115V 0V GRY 10MA Notes: 1. Resistors 1/2W unless otherwise stated. 2. Valves V1 - 12AU7 or 12AX7 (late model) 3. V2, V3 - 12AU7 4. Valves V4, V5 - 6L6GC 5. Parts in red appear to be added after manufacture and were identical in two units. 6. B Voltages are approximates. 7. Located on foil side of board. Warnings: Danger! High Voltage! Do not use fuses of higher ratings than specified. Service: If this amplifier is in need of servicing, it should be taken to a reliable radio person. SD-1B SD-1B SD-1Y B2 350V B1 (B+) 480V -32V (BIAS) 8 5K 10W 6K (approx. 27:1) 10 5W 4 20 5W GRY BLK GRN YLW 8 8 3 3 22 77 4 5 4 5 V4 V5 999 4-54-54-5 470 V2 47K47K 100K100K 0.1 400V 47K 470K 470K 3 8 1 6 2 7 B3 270V V3 0.010.01 0.02 400V 3 8 1 6 47K39K 10K 0.05 100K 20 350V 500KA 500KA 500KA B4 190V 0.002 0.005 100K 10K 0.0010.005 100K 220K V1BV1A 3.3K 220K 470K 3.3K 47K 470K 250p7 500p 1.5K 1M1M 2.2K VOLUMEBASSTREBLE 10 350V 0.002 0.1 470K 470K 2.2M 20K 0.005 SHARPDEEP 2 7 7 6 8 2 1 3 BLK GRN UNIVOX U-235-PB MANUFACTURED BY: UNICORD CORPORATION This schematic was developed from U-235-PB Amplifiers, SN- 41923, SN-28286, and SN-42791, made in Japan. The Amplifiers used to develop this schematic, appeared to the documenter to be original factory construction and components, and serviced by authorized factory servicers. This schematic was developed for reference purposes only. The developer makes no claims to the authenticity of the amplifiers used to develop this schematic, to the accuracy of this document, its accuracy as a representation of the original design, the stated Manufacturer, Make, Model Number, and Country of Manufacture. 200619sa 0.1 400V 0.02 400V 0.05 0.02 400V 0.01 400V BLK BASS HIGH LOW 20 350V 0.001 RED RED RED YLW GRY GRN 收音机爱好者资料库 Ra d i o Fa n s .CN