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Service Manual
Boat
Thorn Studio 500 and 600
Models
501 502 503
004 600
602 603 604
Power Output
(Measured with
1
both channels driven).
and
502:
15
or
501
channel.
503, 504, 600, 601, 602, 603,
per channel.
watts.
604:
20
Frequency Response
kHz+
30 Hz— 20
input.
Power Bandwidth
kHz
unclipped
30Hz
20
—
points
Distortion
than
Less
0.1%
up
maximum power output.
Sensitivity
kHz for 15w
(Measured
at
1
Magnetic pickup
input
Tape
Auxiliary input
Power Consumption
nominal
from
watts
75
AC 50
(215-245V)
Semi-conductor Complement
Transistors
26
Diodes
10
The
right
is reserved to vary
THORN OU
RADIO
aRES
601
TECHNICAL SPECIFICATIONS
kHz
sinewave,
watts per
20
dB
using tape
1
at
dB
2
—
below
dB
to
1
output).
4mV
200 mV
mV
85
230V
Hz.
Supply.
alternative materials
specifications
or use
MEMBER OF THE THORN GROUP OF
A
series
Tone Controls
(Reference
Bass =
12 dB
Treble
+
12 dB
Contour
below full
30 dB
(at
at 40 Hz
+
dB
9
at
+
dB
10
7
Filter
Low
20
dB
at
—
Filter
High
dB at
10
—
Crosstalk
than
Better
input.
Tape Output
with
100 mV
Source impedance
kHz.
1
Auxiliary Output
with
100 mV
Source impedance
kHz.
1
deemed necessary
as may be
IN
18 NATIONS
COMPANIES
dB
at
kHz)
0
1
at 40 Hz
kHz
at
10
setting).
volume
kHz
Hz
20
kHz
10
kHz
40
at
for
dB
any
1
into
at
4
gram
mV
100 k
into
at
4
gram
mV
100 k
desirable
at any time.
or
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Summarization of Contents
TECHNICAL SPECIFICATIONS
Power Output
Details power output ratings for different models, measured at 1 kHz sinewave.
Frequency Response
Specifies the frequency range and tolerance for tape input.
Power Bandwidth
Defines the frequency range for unclipped output at specified points.
Distortion
States the maximum distortion level relative to maximum power output.
Sensitivity
Provides sensitivity levels for magnetic pickup, tape, and auxiliary inputs.
Power Consumption
Indicates the power draw from the AC supply.
Semi-conductor Complement
Lists the number of transistors and diodes used in the unit.
Tone Controls
Details the range and frequency for bass and treble adjustments.
Contour
Describes the effect of the contour circuit at specific frequencies and volume levels.
Low Filter
Specifies the cutoff frequency for the low-pass filter.
High Filter
Specifies the cutoff frequency for the high-pass filter.
Crosstalk
Defines the signal isolation between channels at 1 kHz.
Tape Output
Specifies output voltage and source impedance for tape recording.
Auxiliary Output
Specifies output voltage and source impedance for auxiliary devices.
SERVICING 500 AND 600 SERIES AMBIOPHONIC UNITS
Unit Dismantling Procedures
Step-by-step guide for safely disassembling the unit for servicing.
Model 600 Tuner Amplifier Servicing Notes
Specific instructions for removing the cabinet from the Model 600 Tuner Amplifier.
TUNER ALIGNMENT
IF Stage Alignment
Procedure for aligning the IF stage using an AC millivoltmeter and signal generator.
Calibration and Sensitivity RF Alignment
Aligns RF stages and calibrates sensitivity using signal generator and tuning adjustments.
SERVICE HINTS
Power Amplifier Board Troubleshooting
Guidance on checking and troubleshooting the power amplifier board for faults.
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