Krohn-Hite Corporation DCA-10 Amplifier
Manufacturer:
Model:
DCA-10
Date:
0
Category:
Group:
Description:
WIDE-BAND · DC-1MC 10 WATT AMPLIFIER

Information

TECHNICAL SUMMARY POWER OUTPUT: 10 volt-amperes (20 volt-ampere peaks}, continuous, from dc to 500 kc into a 1,000 ohm resistive or reactive load; 10 watts (Z0 watt peaks}, continuous, from 1 cps to 1 me into a 600 ohm resistive load. See Note 2 on Page 7 and Figure II. OUTPUT VOLTAGE: Greater than 105 volts rms (300 volts peak to peak) open circuit from dc to 1 me; 100 volts rms (280 volts peak to peak) across 1, 000 ohms from dc to 500 kc; 78 volts rms (218 volts peak to peak) across 600 ohms from I cps to 1 me. OUTPUT CURRENT: Above 1 cps, greater than 210 ma rms (£300 ma peak) through 10 ohms; 130 ma rms (±180 ma peak) through 600 ohms; 100 ma rms (±140 ma peak) through 1,000 ohms. Below 1 cps, 42 ma rms (±60 ma peak) through 10 ohms; 52 marms.(afc75 mapeak) through 600 ohms; 100 ma rms (±140 ma peak) through 1, 000 ohms, OUTPUT REGULATION (from no load to full resistive load): Less than 2% from 10 cps to 100kc, less than 5% over the entire frequency range. INTERNAL IMPEDANCE: Less than 10 ohms from 10 cps to 50 kc, less than 50 ohms from dc to 100 kc and less than 100 ohms above 100 kc. LOAD IMPEDANCE: Matching, nominal 600 ohms from 1 cps to I me; below 1 cps, 1, 000 ohms minimum load for full power output. See Figure 8. Minimum load, 10 ohms. See Figure 10. LOAD POWER FACTOR: Unity to zero, lagging or leading, OUTPUT DC LEVEL: Zero volts at capacitor-coupled AC OUTPUT terminals; nominal zero volts at the DC OUTPUT terminals. OUTPUT DC LEVEL STABILITY {typical, after initial warm up, expressed in per cent of peak output voltage): ±0. 02% in any one-hour period at fixed line voltage and ±0. 2% for ±10% line voltage change in all positions of the INPUT SELECTOR switch except the X1Ö DC and POT DC positions where ±0. 1% and ±1% apply, VOLTAGE GAIN: Maximum of 10, variable continuously, fixed gain of i0± 10% (20±1 db), or fixed gain of 1 ± 10% (0 ± 1 db) as determined by the INPUT SELECTOR switch. Less than ±0. 25 db change in gain for a 10% change in line voltage within the operating range. FREQUENCY RESPONSE; Flat within ±1 db from dc to 1 me under all specified operating conditions; approximately 3 db down at 2 me. See Figure 10. PHASE SHIFT: Zero ±1 degree from dc to 10 kc in the XI0 and POT positions of the INPUT SELECTOR switch. See Figure 13, In the XI position the phase shift is 180 ±1 degrees. HARMONIC DISTORTION (rms): At full power output, less than 0. 1% from 20 cps to 50 kc, less than 0. 5% from near dc to 100 kc and less than 3% above 100 kc. In the XI positions of the INPUT SELECTOR switch the distortion is less than 5% above 100 kc. See Figure 12. DC linearity is within +1% with loads above 500 ohms. HUM AND NOISE (referred to output): Less than 10 mv with the input shorted and less than 20 mv with an open circuit input. DYNAMIC RANGE: Approximately 80 db* SQUARE WAVE RESPONSE: See Figure 9. INPUT IMPEDANCE: Greater than 1 megohm in parallel with approximately 50 uuf in the fixed gain positions; 5, 000 ohms in parallel with approximately 50 uuf in the variable gain positions. INPUT COUPLING: Either direct coupling or capacitor coupling with a low cut-off frequency o£ 1 cps,_ INPUT SENSITIVITY: 7. 8 volts rms with a 600 ohm load and 10 volts rms with a I» 000 ohm load for 10 watts output at maximum gain (XI0). INPUT VOLTAGE LIMITS: 4.00 volt maximum dc component in the ac coupled {1 CPS) fixed gain positions; combined input signal voltages (ac and dc) must not cause more than 2 watts dissipation in the 5, 000 ohm GAIN potentiometer in either variable gain position, AMBIENT TEMPERATURE AND DUTY CYCLE; Continuous duty at full 10 watt output up to 5G°C (122°F) ambient. FRONT PANEL CONTROLS: INPUT SELECTOR switch. GAIN control. OUTPUT DC LEVEL control (screwdriver adjust). POWER ON switch. TERMINALS: Two multi-purpose binding posts for the INPUT (signal and ground)and three for the OUTPUT (DC signal, AC signal and ground). POWER REQUIREMENTS: 105-125 or 210-250 volts; single phase; 50-60 cycles; 250 watts. FUSE PROTECTION: Line: 2. 5 ampere slow-blow. Plate supply: 3/16 ampere slow-blow. TUBE COMPLEMENT (furnished with instrument): 2-6GT5, 2-6CL6, 1-6AQ5, 1-12AX7, 1-6AS7-GA, 1-6BK7-B, I-5R4-GYB. FORM: Furnished in an attractively styled perforated steel cabinet with a. cast aluminum front panel and frame. Front panel finished in gray enamel; frame and cabinet in blue enamel. Other finishes available on special order. Over-all dimensions Model DCA-IO: 7 I /Zu wide, 10” high, 15" deep. Weight 35 lbs. net, 40 lbs. shipping.

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Service and User Manual
Manual type:
Service and User Manual
Pages:
64
Size:
3.22 Mbytes (3374568 Bytes)
Language:
english
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Manual ID:
Date:
Quality:
Scanned document, reading partly badly, partly not readable.
Upload date:
2015 09 06
MD5:
a818f75a8173212ab02a1e54e6c4b5ca
Downloads:
592

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OPERATING AMD MAINTENANCE MANUAL 1. Technical Summary, ... 5 2, Description ... 8 SECTION II - OPERATION 1. Controls. . ... * . . . 9 2. Load Impedance ... 10 3. Line Voltage ... 10 4. Terminals ... 11 5. Test Jack Voltage and Output DC Level ... 11 6. Fuses and Indicators. ... . II SECTION III - CIRCUIT DESCRIPTION 1. Input Stage ... 12 Z, Driver Stage ... 13 3. Output Stage ... 14 4. Over-all Feedback Network ... . 16 5. Input Selector Switch ... 16 6. Stabilization ... 18 7. ' Power Supply ... 19 SECTION IV - MAINTENANCE 1. Fuse Failure. ... 21 2. Tube Replacement. . . , ... 22 3. Power supply Description ... 23 4. Power supply Maintenance ... ... 24 5. Amplifier Description ... 27 6. Amplifier Maintenance ... ... 28 7. Amplifier Gain vs. Frequency ... 30 8. Air Filter ... , ... 35 SECTION V - 500 HOUR CHECK ... 35 SECTION VI - ACCEPTANCE AND PERFORMANCE TESTS ... 39 1. Power Output ... ... 41 2. Output Regulation ... 42 3. Internal Impedance ... 42 4. Output DC Level Stability ... 43 5. Frequency Response ... 43 6. Phase Shift ... 43 7. Harmonic Distortion ... 43 8. Hum and Noise ... 47 9. Dynamic Range. ... 47 10. Square-Wave Response. . ... 48 SECTION VII - SERVICE AND WARRANTY ... 48 SECTION VIII - TYPICAL PERFORMANCE CURVES ... 49 SECTION IX - PARTS LIST ... .. . c?

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