Equipment information:

Krohn-Hite Corporation DCA-10 Amplifier
Manufacturer:
Krohn-Hite Corporation
Model: DCA-10
Date:
Category: Measurement instruments
Group: Amplifier
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. 

These manuals are available for the above equipment:

Krohn-Hite Corporation -- DCA-10 -- Service and User Manual
File name: KrohnHite-7109-Manual-Page-1-Picture
Manual Type: Service and User Manual
Pages: 64
Size: 3.22 Mbytes (3374568 Bytes)
Language: english
Revision:
Manual-ID/Number:
Date:
Quality: Scanned document, reading partly badly, partly not readable.
Upload date:
MD5: a818f75a8173212ab02a1e54e6c4b5ca
ed2kID: 190491e52d88ce3c5867cca214d0c8e4
Downloads: 47 since 06 September 2015
Information:
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?
KrohnHite-7109-Manual-Page-1-Picture
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