Page 1
Dynavector P75 mk4
phono preamplifier and
phono enhancer
instructions and specifications
Page 2
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 t he 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.
1
Page 3
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 Ω (ohms)
Low Output Moving Coil 0.2mV (200µV) 60 & 63dB 30, 60, 100, 220, 470*
Suggested minimum 0.15mV (150µV)
Shunt Capacitance (pF) 660, 760, 860*
Medium Output MC/MM 1.0mV 56dB 470 Ω
High Output Moving Coil 2.0mV 40 & 46dB 47k (47,000) Ω
or Moving Magnet,
or Moving Iron
Shunt Capacitance (pF) 100, 200, 300*
* 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
Specs 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.
2
Page 4
P75 mk4 Jumper Location and Settings
The P75 can be adjusted to suit any cartridge on the market.
Adjustments are easily made by the user. No soldering or extra components are
required.
The different settings are made by changing the position of jumpers on the Jumper
Blocks. The layout of the jumpers is shown below.
Standard / Default Settings
When delivered from the factory, the P75 is set to the following standard setting:
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.
3
Page 5
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 manufacturer of the cartridge usually publishes recommended loading settings.
If no cartridge information is availab le, we strongly recommend the default setting of:
100 Ohm, 63dB gain. (As per the jumper position shown below).
Left channel shown, Right channel is identical.
Adjust loading resistance via
JB1 and JB2.
Set gain via JB3 and JB4.
Additional input capacitance
can be added via JB10 and
JB11.
For MC cartridges this is not
required and will have little
effect.
Fit custom Resistor and Capacitor
loading here.
(remove normal loading jumpers
from JB1 and JB2)
Medium output - 1mV MC
Use "Low output MC - standard phono" mode above.
Set gain to 56dB by fitt ing all three jumpers to JB3 & JB4.
Set loading to 470 Ω via JB1 & JB2.
See above for jumper locations.
4
Page 6
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.
Match cartridge coil DC resistance*
(sets output level)
Phono Enhancer mode notes
* The coil resistance is obtained from the cartridge manufacturer's 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 Ω (ohms)
Recommended load resistance >30 Ω. Ignore this in PE Mode.
The DC coil resistance for the DV-XX2 mkII is 6 ohms therefore in PE mode, set
JB3 & 4 for a low resistance coil (the 4 - 10 Ω range)
See www.dynavector.com for complete Dynavector cartridge specifications.
5
Page 7
High output MC or Moving Magnet
Left channel shown, Right channel is identical.
To adjust, slide miniature switch.
(remove orange cover tape if present)
Fit one or more jumpers here for
MM.
Its a good place to keep unused
jumpers.
Standard MM input Capacitance
is 100pF.
Additional input capacitance can
be added via JB10 and JB11.
Fit custom Resistor and
Capacitor loading here.
Final comments and advice
The P75 solves most cartridge/phono mat chi ng 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, lifelike sound quality. They do need
a little more care and attention and small changes can make a big difference.
It may seem strange in this online world, but our best advice is to find a great local HiFi dealer and build a long term relationship with them. A good local Hi-Fi dealer can
transform the sound in your home. They have done all the hard work finding the best
equipment available and can optimise your room acoustics.
Thank you for supporting Dynavector product s, happy listening !
6
Page 8
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 wit h the appearance and functional
design of our Dynavector products. While his insight will be sorely
missed, we shall continue to follow his clear guiding principles.
Haere ra John.
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.
© Dynavector Systems Australia Pty Ltd 2017 P75 mk4 manual rev 1.0
Loading...