The Power
Amplifier Model 5 it is a revised and
more attractive version of the Model 2
Marantz
Power Amplifier have been designed and constructed to give a long, trouble-free
life of fine listening quality. Here is the type of performance and workmanship
that previously was found only in high quality broadcast or laboratory
equipment. Built-in metered test instruments permit simple, accurate
adjustments for optimum performance.
The Model
5 is essentially a smaller version of
the 40 Watt Model 2, with certain minor simplifications, never theless
embodying fully the same quality.
Its exterior
design adapts itself to instalation requirements for multiple amplifier systems
such as in stereophonic applications and in those embodying the Marantz
Electronic Crossover.
Specifications
Power
Output: 30 Watts (60 Watts peak)
"Ultra-Linear" operation.
18 Watts of
excellent Triode operation can be had by altering two connections inside
chassis.
Output
Connections: 4, 8 and 16 ohms
Input
Sensitivity (for 30 watts): 1,3 volts
RMS into 250 kohm
Response:
At 30 Watts
: Within 0,2 dB from 20 cps to 20 kc 9equivalent of ±0,1 dB from 15 cps to 40
kc into "Grid" (or test) input.
At ½ Watt : ±1 dB from 3 cps to 40 kc. Response
has been deliberately rolled off approx. 7 dB at 100 kc to control transient
response.
Subsonic
Filter in standard "Input" slowly rolls response off below 20 cps
(less than 1 dB at 20 cps, -10 dB at 3 cps, etc)
Distortion
at 30 Watts
Total
Harmonic Distortion : less than 0,1% at
mid-frequencies. Less than 0,5% from 20 cps to 10 kc. Less than 1,0% at 20 kc
with resistive load (much less of equivalent voltages with inductive speaker
loads).
Intermodulation
Distortion : less than 0,5% (60 cps/12
kc, 4:1)
IM
measurement of typical amplifier: 35 W equivalent 0,5%;
30 W equiv. 0,28%; 20 W equiv.
0,17%; 10 W equiv. 0,11%
Distortion
below 30 W is largely of 2nd order and reduces rapidly with signal level
Damping
Factors:
Greater
than 20 from 20 cps to 20 kc (instructions given for optional insertion by the
customer of two additional resistors to provide damping factors of 2, 1, or ½)
Inverse
Feedback and Stability:
20 dB of
overall feedback. Great care has been taken to ensure stability and low
distortion under widely varying loods, both resistive and reactive, such as are
encountered in loudspeaker systems.
Power supply surges are balanced out of signal channels providing
excellent recovery from strong transients. Will not oscillate under any
condition of open circuit capocitive load.
Hum:
Beter than
90 dB below 30 Watts containing proportion ately little of high order
components.
Metered test
and Adjustments:
Built-in
meter and test switch provide acurate adjustment of each output tube bias. This
makes the use of matched tubes unnecessary. Adjustable A.C. Balance (located subchassis) pre-set at
factory
Power
Supply:
The use of a
transmitting type oil condenser, choke, telephone quality electrolytic, and
GZ-34 heater-cathode rectifier provide protection from starting surge voltages,
improved regulation, and thorough filtering, together with long life.
Power
Requirements:
Design
center 117 volts, 60 cycles. Range 105 -125 volts. 100 watts at zero signal;
130 Watts at maximum signal
Tube
Complements:
1 x
6BH6; 1 X 6CG7; 2 X EL34/6CA7; 1 X GZ34
Dimensions (W x H x D): 6"
x 7 ⅜" x 15 ¼"
Weight: 35 lbs (shipping with grille)