Jvc M 3030 Brochure

Page 1

M _ 3030 DC STEREO POWER AMPLIFIER

An ordinary stereo power amplifier is put to a
very Simple task' Accurate amplification of
miniscule Signals from the paired preamplifier.
With .3 high-power amplifier like the Dal-3030,
this Simple task becomes more difficult, for it
must handle ti Wide range of power from several
YTTIHIVVdITS
noticeable dlSIOlTlOllt

AccurtiCy IS the hallmark of the JVC lvli3030t
Its DC Jilllp configuration assures rninirnurn
dynamic distortion (or "transtent intermodulm
tron distortion"), that kind oi distortion which
becomes apparent when an amplifier handles
program material, Le. music.

The JVC Fri-3030 has sermrate power supplies
for Class-A and B operated Circuits This giSSures
distinctive localization .ind imaging in [l repro-
duced sound field lts lCL construction Without
input couplinu CdpdClTUl) terttoves the manor

to several hundred watts With no

cause of harm to tonal riuiility. Twmrntmn amp
constructmn reduces steady-state crosstalk dis-
TOlYlOi'T

How .lCCilldIC is this outstanding JVC power
amp Here's proof Total htill'lTUlllC distortion ()1
less than 0007 i lat lkHzl at rated output. Less
than 005 _ interitrtxlul.itioii distortion. VJidt. C
to 100,000Hr frequency rtPSDOHSc d1 1W output
For mufe evidence ot M~303O accuracy, pletise

read on

DC Amplifier Configuration

A DC desmn IS not new for ordinary aflDih
fiers. But when the DC configuration IS applied
in high fidelity .iudio etmipment, thtit's nev."
The difference between the DC and the conven-
()Hdi AC ttffipilflfif is this: The new configura-
tion amp hasnt even one capaCitOr in its crrcurt
7 not In the Sign. path nor in the negative
feedback loop A CdpaClIOl in a circun CdUSES
delay for tho: .tlflpilflffti Storm]; the more complex
information the Slqlei (IOHTHIDS, the lliiHt, delay,
Or the more distortion it causes An LllelO
amplifier ot DC (IOHTIQUHHIDH does not .implify

DC srqnals, nor does it need to; however, we've
employed the DC configuration for the NT'3030
to accurately reproduce complex Signals and to
further reduce dynamic distortion.

The Double Differential Common-Mode
Feedback input circuit assures stable balanced
voltages, eliminating possrble harmful direct-
current components. This means the JVC
M-3030 delivers The Musrml Truth, always

Separate Power Supplies for Class-A/B
Amplifiers

'PFWER SUPPLYCSYSTEM #08 THE M3630

The nil-3030 has three Separate power supplies
one for the Class-A predriver stages, one for the
Class-8 left-Channel power driver and one for
the Class-8 riqhtchannel power driver. This
JVC-originated triple-power supply construction
effectively suppresses distortion in
dynamic conditions of tr power amplifier.

There are two kinds of dynamic croxSm/A'

Crosstalk

distortion llTll'd-Chdlttlel and inter-channel.
IntfdChdnllii crosstalk is generated when ()Dtitr'l'

tion of the ClassA operated predriver amps is

affected by the fluctuations in primary voltage
or balanced voltages, often caused when
masswe power is drained in the Class-B power
driver. With the M3030, the power supplies for
the Class-A amps undClass-B amps are separated.
ln dddlllon, the power supply for the predriver
stages is prowded With stabilized hiqh voltages,
It is thanks to this construction that the Pvt-3030
delivers clear transients and clean overtones.
Inter-channel distortion, on the
other hand, is generated when one of the two
channels delivers much of aggregate enerqy
during loud passages This causes blurred tiring;
mg in a stereo perspective. \"Ue've separated

crosstril k

power supplies for the Class-i3 amps, one for
each channel. Thus the M~303O has dramatically
reduced (,iVllleTlC crosstalk distortion, it permits
Clear (ind resolute stereo irtizrging, and it ctin
even be a touchstone of accuracy for an audio
systems

DYNAMIC CROSSTALK DISTORTIONV

iii

lCL Circuit Configuration

As noted earlier, ti cdpdcntir in ii Stencil v it.
causes delay for the amplified siqnul. SO we've
eliminated input coupling capacnors used het-

Page 2

BLOCK DIAGRAM

.. .. Class~A Driver Class-B Power
DlRECT _.
L Stage outpu 5mg. -oLelt Speaker Terminal
I
"suasomc'O-l pom,
Transformer
Power
Input Terminals Transformer
Power
"suesomc'o-l l- Transformer
R 1
.. ,. Class-A Driver Class-B Power
I T
D REC 0 Stage Oulpul Stage -0Right Speaker Terminal

ween amplifier stages. This new, JVC-patented
cirCuit configuration, called ICL (Input-Capaci-
tor-Less), has improved transient response, keep-
ing the phase distortion minimum. Since the
M-3030 is also an OCL (Output-Capacitor-Less)
configuration, there are no capacitors at all.
Fluctuation in the balanced voltages - a very
possible hazard with capacitor-less amps - is
eliminated by the JVC-exclusive Double Differ-
ential Common-Mode Feedback circuit.

Twin-Mono Amplifier Construction

To further reduce distortion , of any type -
weve employed a twin-mono amp construction.
At JVC, this construction means not only two
separate power supplies, one for each channel; it
also means that circuit boards and grounding
buses are phy5ically separated. Thus dynamic
crosstalk distortion and steady-state crosstalk
distortion are drastically cut.

3-Darlington Connected Power~0utput Stage

A 3-Darlington connected power-output stage is
employed to reduce the output impedance of
the driver stage to av0id impedance mismatch.
This construction results in improved transistOr
linearity and reduced distortion. The Circuury -
separate power Supplies to Class~A and 8 operat-
ed amps, ICL configuration, DOuble Differential
Common-Mode Feedback de5ign,two-mono amp
construction, 3-Darlington connected power

OUTPUT WAVEFORM oF-zokriz.
20v SIGNAL

"W! WM'orm OU'ml Wnn'arm

ORight Channel Driver CB

ORight Channel Power Transistors
OFlight Channel Power Transformer
OHeavy Duty Heat Sinks

GProtector C8

GLeft Channel Driver C8

0Left Channel Power Transistors
OLeft Channel Power Transformer
OPower Transformer for Class-A Amps

output - permits the M3030 to deliver 100
watts per channel, min. RMS, both channels
driven, into 8 ohms from 20Hz to 20,000Hz
With no more than 0.05% total harmonic distor~
tion, This circuit is so stable that even clipping
power, if its short enough, doesn't cause circuit
instability. Whatever the input levels, low or
high, and whatever the reproduced frequencies,
low or high, the M-303O offers low-distortion.
high-stability performance.

Rugged Construction

The M-3030 lS rugged and heavy . 19.2kg (42.2
pounds). Its appearance suggests, and under-
secres the dynamic, lowdistortion perfonnance.
For control versatility it has separate input level
controls (one for each channel) and two pairs of
input terminals,DlRECT and SUBSONIC. When
the DIRECT terminals are used, the M3030 and
a paired preamplifier are direct connected. When
the SUBSONIC terminals are employed, this
equipment is capacnor c0upled, With subsonic
components filtered. Two sets of terminals are
provided to obtain both stability and excellent
tone quality depending on the quality of other
audio equipment and program materials.

INPUT TERMINALS AND
INPUT LEVEL CONTROLS

SPECIFICATIONS

'N-"l 7' illml 100 Watts per channel, min RMS,
both channels driven, into 8 ohms
from 20 to 20,000H: With no more
than 0057.. total harmonic distortion

lt'iu H.ir Ran-«i 1 At: ..

iutwuo i

Haunt ll .t; i'

. Ilili" ' - 4.70"" - \OC'

130 Watts per channel, min. RMS,
both channels driven, into 4 ohms
from 20 lo 20,000H: wrth no more
than 0.05% total harmonic distortion

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