Dynavector P75 mk4 User manual

phono preamplifier and
phono enhancer
owner's manual

1
IMPORTANT SAFETY INSTRUCTIONS
Read and keep Instructions: Please read all safety and operating instructions
before using this product and retain them for future reference.
Heed warnings: All warnings on the product and in the operating instructions should
be adhered to.
Follow instructions: All operating and use instructions should be followed.
Cleaning: Unplug the product from the wall outlet before cleaning. Do not use liquid
or aerosol cleaners. Use a damp cloth for cleaning.
Power sources: This product should be operated only from the type of power source
indicated on the marking label. If you are not sure consult your dealer.
Servicing: Refer all servicing to qualified service personnel.
Warranty:
Dynavector products are manufactured to very high standards. The Dynavector P75
has a one year warranty to the original owner, from the original date of purchase,
against defects in material and workmanship This warranty does not extend to
damage caused by improper use/installation, faulty ancillary equipment, modifications,
unauthorised repair, shipping damage or loss, abuse, accidents, use on improper
voltage/current, lightning or other acts of God, normal wear and tear, commercial use,
or purchases from unauthorised dealers. Proof of purchase as evidence the unit was
purchased from an authorised dealer within the warranty period may be required for
warranty service. Do not return the product without first contacting your dealer or
Dynavector distributor. This warranty is non-transferable.
P75 mk4 Power Supply and Grounding Notes
The P75 mk4 introduces a new ultra-low noise power supply that is
electrically isolated from the input power. It takes the low grade single
voltage DC supply from the AC adaptor and converts it to dual high
voltages required for true professional quality audio reproduction. Power
supply noise is virtually unmeasurable.
The P75 does not have any mains frequency or other low frequency
components in the power supply and so hum problems that plague
conventional phono amplifiers are eliminated.
While the P75 itself does not generate any hum, the tone arm and
interconnect cables may act as antennae and pick up hum. To remove
hum, connect an earth wire from the turntable to a ground point, usually the
preamp/integrated amp ground.
The P75 is not earthed. An earth terminal is provided on the rear panel that
will allow the P75 to be connected to a ground point if required.

2
P75 mk4 Power Supply Requirements
AC to DC power adaptor 12VDC +/-15% 350mA (min)
Two pin connector centre positive
Outer Diameter 5.5mm
Inner Diameter 2.1mm
Note: Power supply is not included.
Please purchase a suitable supply at your local dealer.
Specifications
The P75 mk4 is a stand-alone phono to line level amplifier. It can operate
with almost any cartridge as follows:
Cartridge type Input sensitivity Gain Loading (ohms)
Low output MC 0.2mV (200µV) 60 & 63dB 30, 60, 100, 220, 470*
Suggested minimum 0.15mV (150µV)
Shunt capacitance 660, 760, 860* (pF)
Medium output 1.0mV 56dB 470
High output MC 2.0mV 40 & 46dB 47k (47,000)
or Moving Magnet,
or Moving Iron
Shunt capacitance 100, 200, 300* (pF)
* Some other R and C loading values available including:
User/Custom Loading: User can fit any custom R or C loading value.
Low Output MC Phono Enhancer
Specifications vary according to cartridge make and model. Output level
determined mainly by the cartridge internal DC coil resistance. Three
resistance/gain adjustments available.
PE Mode only works with low output MC cartridges. It may not suit all
brands or models. Results obtained depend on the quality of the cartridge's
magnetic circuit. Unsure? Try it out, it can do no harm.
Warning: Under no circumstances should a signal generator be used with
the phono enhancer circuit, as excessive current from the generator may
damage the P75.
Always turn off power to the audio system (including power to the P75)
when altering jumpers or settings inside the P75.

3
P75 mk4 Jumper Location and Settings
The P75 can be adjusted to suit any cartridge on the market.
Adjustment is simple. No soldering or extra parts needed.
The different settings are made by changing the position of jumpers on the
Jumper Blocks. The layout of the jumpers is shown below.
Standard / Factory Default Setting
The P75 is shipped from the factory as follows:
Low output moving coil 100 ohm 63dB gain. Shown below.
This setting is perfect for about 95% of low output moving coil cartridges.
Tip:
place unused/spare jumpers
half-on (just connected to one
pin). This prevents them
getting lost.

4
Low output MC - standard phono
The diagram below shows the available settings for using the P75 in
standard amplifier mode with low output moving coil cartridges.
Not sure what setting to use?
The cartridge manufacturer usually recommends loading settings.
If no cartridge information is available, we strongly recommend the default
setting of: 100 Ohm, 63dB gain. (As per the jumper position shown below).
One channel shown, other channel is identical
Medium output - 1mV MC
Use "Low output MC - standard phono" mode above.
Set gain to 56dB by fitting all three jumpers to JB3 & JB4.
Set loading to 470 via JB1 & JB2.
See above for jumper locations.
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Additional input
capacitance can be added
via JB11 and JB12.
For MC cartridges this is
not required and will have
little effect.
Set gain via JB3 and JB4
Adjust loading resistance via JB1 and JB2
Fit custom Resistor and Capacitor loading here
(remove normal loading jumpers from JB1 and JB2)

5
Phono Enhancer mode notes
* The coil resistance is obtained from the cartridge specifications.
This resistance is the DC resistance of the coil, sometimes referred to as
the impedance. It is not the cartridge loading resistance.
An example may help:
Dynavector's DV XX2 mkII specification sheet gives the following:
Impedance R = 6 (ohms)
Recommended load resistance >30 . Ignore this in PE Mode.
The DC coil resistance for the DV-XX2 mkII is 6 therefore in PE mode, set
JB3 & 4 for a low resistance coil (the 4 - 10 range)
See www.dynavector.com for complete Dynavector cartridge specifications.
Low output MC - Phono Enhancer Mode (PE Mode)
The diagram below shows the available settings for using the P75 in the
special Phono Enhancer Mode (PE Mode).
One channel is shown for clarity,
the other channel is identical.
y
,
Match cartridge coil DC resistance*
(sets output level)

6
High output MC or Moving Magnet
One channel shown, other channel is identical
Standard MM input Capacitance
is 100pF.
Additional input capacitance can
be added via JB11 and JB12.
Fit custom Resistor and
Capacitor loading here.
Fit one or more jumpers here
for MM.
Its a good place to keep
unused jumpers.
To adjust, slide miniature switch.
(remove orange cover tape if present)
Final comments and advice
The P75 solves most cartridge/phono matching issues by presenting the
cartridge with a constant, purely resistive load right across the audio band
and beyond. This allows all cartridge types to perform at their best. It also
has far superior rejection of common-mode noise than other phono
amplifiers making it less susceptible to interference and noise.
Analog playback systems can produce amazing, life-like sound quality.
They do need a little more care and attention and small changes can make
a big difference.
Our best advice, even in this online world, is to find a great local Hi-Fi
dealer and build a long term relationship with them. A great local Hi-Fi
dealer can transform the sound in your home.

www.dynavector.com.au
Designed and manufactured in Australia by
Dynavector Amplifiers Australia.
For support please contact your
local Hi-Fi dealer or Dynavector Distributor.
In appreciation
We wish to express our great appreciation to the late Mr John Bevan
Ford of New Zealand-Aotearoa, contemporary Maori artist and music
devotee, for his generous assistance with the appearance and functional
design of our Dynavector products. While his insight is sorely missed, we
shall continue to follow his clear guiding principles.
Haere ra John.
© Dynavector Systems Australia Pty Ltd 2017-18 P75 mk4 manual rev 1.2