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Summary of Contents for Lambda Electronics 71
- Page 1 INSTRUCTION MANUAL POWER SUPPLY MODEL ____71____ SPEC._______ LAMBDA ELECTRONICS CORP. COLLEGE POINT 56, N. Y.
- Page 2 INSTRUCTION MANUAL REGULATED POWER SUPPLY MODEL 71 MANUFACTURED BY LAMBDA ELECTRONICS CORP. CORONA 68, NEW YORK ISSUE A MODEL NO. 71 1-55-123 SERIAL NO. 1525...
- Page 3 MODEL 71 1. GENERAL DESCRIPTION 1. GENERAL DESCRIPTION. The Model 71 power supply described in this manual is designed for general purpose use in industry, laboratory, radio station and school to supply power to electronic and other equipment. The DC output voltages are electronically regulated, are practically independent of normal line voltage fluctuations and substantially free from hum and noise.
- Page 4 2. ELECTRICAL SPECIFICATIONS: Input; 105-125 VAC, 50-60 CPS, 475 W (max) DC Output No. 1; (regulated for line and load) Voltage: 0-500 VDC (continuously variable) Current; 0-200 MA (over entire voltage range) Regulation (line); 0.15% or 0.3 volt (whichever is greater) Regulation (load);...
- Page 5 Ambient Temperature And Duty Cycle: Continuous duty at full load up to 40°C (104°F) ambient. Overload Protection: External overload protection AC and DC systems utilize magnetic circuit breakers. Trip- Free. Instant manual reset. Front panel. Internal Failure Protection Fuses, access through rear of cabinet.
- Page 6 TUBE COMPLEMENT: Tube Type Quantity Function 5R4·GY 1 Rectifier 6X4 1 Rectifier 6w6-GT 6 Control Tubes 6N030 1 Time Delay Relay 12AX7 3 Voltage Amplifier 5651 1 Voltage Reference 0A2 1 Voltage Stabilizer 3. MECHANICAL SPECIFICATIONS: Size and Weight and Finish Size 13"...
- Page 7 II. OPERATING INSTRUCTIONS. MODEL 71 1. OPERATING CONTROLS. a) The "AC" circuit-breaker is in series with the AC line and controls power to the supply. When the toggle of the "AC" breaker is in the "ON" position, the adjacent pilot- light indicator marked "AC"...
- Page 8 g) The "BIAS" control is a wirewound potentiometer which permits the bias output voltage to be set to any value from zero to the maximum output voltage of either bias voltage range. h) The "OUTPUT VOLTAGE" meter is a 3-1/2 inch panel instrument which indicates either the "HV"...
- Page 9 OBSERVE THE USUAL SAFETY PRECAUTIONS WHEN OPERATING OR SERVICING THE EQUIPMENT TO AVOID SEVERE SHOCK OR INJURY. 3. PLACING MODEL 71 INTO OPERATION. a) Both the "AC" and "DC" circuit·breakers snouid be in the "OFF" position. The "HV" control and the "BIAS"...
- Page 10 e) After approximately 30 seconds, throw the "DC" circuit-breaker to the "ON" position. The pilot-light indicator marked "DC" will be illuminated, and the internal plate-power·relay will close. If the "DC" circuit breaker is thrown to the "ON" position before the 30 second time delay has elapsed, the pilot indicator will not light nor will the plate-power-relay close until the time-delay cycle is complete.
- Page 11 the "AC" breaker on again will restore operation. If the supply is off for more than one minute the thermal delay- relay may re-cycle before DC voltage will be present at the output terminals. (see CAUTION note in paragraph 3 above).
- Page 12 6. NOISE AND RIPPLE OUTPUT: The noise and ripple output of the high-voltage DC supply should be less then 5 millivolts rms and the DC bias supply less than 5 millivolts rms at all voltages and load conditions within the specifications. Measurement of thls level of voltage may be made with an AC VTVM capable of reading 5-8 millivo1ts rms.
- Page 13 SERVICING THE EQUIPMENT TO AVOID SHOCK OR INJURY. 1. GENERAL. Under normal conditions no special maintenance of the Model 71 regulated power supply is required except for occasional tube replacement. In the event of failure, or inability of the regulated DC output circuits to function properly a list of typical symptoms and their probable causes is given in paragraph "6"...
- Page 14 20 seconds or later than 1 minute from a cold start, the 6N030 should be replaced. c) 0A2 VOLTAGE REGULATOR TUBE: Upon placing the Model 71 power supply into an operating condition at any setting of output voltage the 0A2 should exhibit an lnternal pale purple glow. If tube falls to glow or appears to flicker, the tube should be replaced.
- Page 15 REGULATION WITH LINE: A Variac or Powerstat connected between the AC power line and the input to the Model 71 may be employed to check the regulation of the DC output circuits. With the "Output Voltage" voltmeter ln the circuit being monitored...
- Page 16 6. TYPICAL POWER SUPPLY FAILURE CONDITIONS AND THEIR PORTABLE CAUSES. SAFETY NOTICE DANGEROUS VOLTAGES EXIST IN THIS EQUIPMENT. OBSERVE THE USUAL SAFETY PRECAUTIONS WHEN OPERATING OR SERVICING THE EQUIPMENT TO AVOID SEVERE SHOCK OR INJURY. Refer to the Schematic Diagram for proper operating voltages in the equipment.
- Page 17 If upon removal of any tube V2-V6, this condition is eliminated, replace this faulty tube with a new tube. 2) Filament burnout of 12AX7. V8. lf tubes V2-V6 ere all found to be good, the 12AX7, V8 may have a burned out filament.
- Page 18 d) Presence of positive 1) Filament burnout of l2AX7, low level "HV" voltage as V11. This is easily checked compared with that by replacement with a new indicated on the "HV" dial, tube. poor regulation and high ripple. (no external load 2) Check voltage across applied to "HV"...
- Page 19 f) Apparent satisfactory 1) Faulty 6W6-GT tubes, V2 operation at low current through v6, will cause values with supply failure remaining 6W6-GT tubes to at 200 MA external and carry excess load. Tubes 105 line. should be visually inspected for filament burnout. If burnout is not apparent, then tubes should be checked on a tube checker.
- Page 20 7. MAINTENANCE OF THE POWERSTAT ("HV" CONTROL). a) DETERMINING DEFECTIVE OPERATION: When the brush contact of the "Powerstat" indicates excessive wear (less than 1/32" of the carbon brush extends from the brush holder) or arcing occurs when the "Powerstat" is rotated with a load on the supply resulting in high noise output from the equipment or hash in RF equipment in the laboratory, the brush contact should be examined.
- Page 21 3. Separate the assembly from panel by unscrewing of the four phillips head screws holding the unit to the front panel. 4. Powerstat and precision potentiometer assembly may now be separated from panel. b) REPLACEMENT OF POWERSTAT OR PRECISION POTENTIOMETER. 1.
- Page 22 6. Check the assembly for smooth rotation and reassemble into equipment. b) REPLACEMENT OF THE "VOLTMETER" AND "BIAS RANGE" SWITCHES. The replacement of either of these switches can be facilitated by removing the panel as outlined above. _SAFETY NOTICE_ DANGEROUS VOLTAGES EXIST IN THIS EQUIPMENT. OBSERVE THE USUAL SAFETY PRECAUTIONS WHEN OPERATING OR SERVICING THE EQUIPMENT TO AVOID SEVERE SHOCK OR INJURY.
- Page 24 3. Tolerance of capacitors is +/-10%, unless noted. REGULATED POWER SUPPLY 4. Arrows indicate clockwise rotation of potentiometer shafts. 5. V Indicates connection to chassis. MODEL 71 6. * Indicates factory adjustments. See instruction manual. 7. (/) Indicates screwdriver slot. /L\ 8.
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