phono preamplifier and
phono enhancer
instructions and specifications
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.Thiswarrantyisnon-transferable.
This product can be recycled. Products bearing this symbol must NOT be
thrown away with the normal household waste. At the end of the product’s life,
take it to a collection point designated for recycling of electrical and electronic
devices. Find out more about return and collection points through your local
authority.
The European Waste Electrical and Electronic (WEEE) Directive was
implemented to dramatically reduce the amount of waste going to land fills,
thereby reducing the environmental impact on the planet and on human health.
Please act responsibly by recycling used products. If this product is still
useable, consider givingit away or resellingit.
P75 mk3 power supply requirements
AC to DC power adaptor 12VDC +/-20% 500mA
Two pin adaptor 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 mk3 is a stand-alone phono to line level amplifier. It can operate with the
following cartridge types:
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 560pF* (all cartridge types)
Low Output MC Phono Enhancer
specs vary according to cartridge make and model, determined mainly by the
cartridge internal DC coil resistance. Three resistance/gain adjustments
available.
High output Moving Coil 2.0mV 40 & 46dB 47k (47,000) Ω
or Moving Magnet,
or Moving Iron
Medium Output MC/MM 1.0mV 50dB 47k (47,000) Ω
* Some other R and C loading values available including user/custom values.
Always turn off power to the audio system (including power to the P75) when
altering jumpers or settings inside the P75.
NOTE: Under no circumstances should a signal generator be used with the
phono enhancer circuit, as excessive current from the generator may damage the
P75.
P75 Design Notes
The P75 has a unique power supply that runs at over 1/4MHz.
It takes the low grade single voltage DC supply from the ac adapter and
converts it to the dual high voltages required for true professional
quality audio reproduction. The operating frequency is over 12 times
higher than the top of the audio band and it incorporates super low
noise wideband regulators in its output stage to give ultra low noise
supply rails.
The internal P75 power supply is totally self contained and stores many
times the maximum possible energy requirements of the phono
amplifiers. This means that the quality or size of the external ac adaptor
is irrelevant. Increasing the capacity of the external supply will make no
difference to the quality of the sound.
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.
Note: The P75 supply requires a higher peak current to start up and so
we do not recommend using an adaptor of less than 500mA.
The P75 also has a great advantage over many other designs. It
presents a constant and almost purely resistive load to the cartridge
right across the audio band and beyond. This provides the cartridge
with an ideal load, removing so-called "matching" problems.
The P75 also incorporates the unique Phono amplifier invented by Dr
Tominari of Dynavector Systems Ltd, Japan, called a Phono Enhancer.
An earth terminal is provided on the rear panel that will allow the metal
chassis to be connected to earth if required.
While the P75 itself does not generate any hum, the tone arm and
interconnect cables may act as antennae and pick-up some hum. This
is normally removed by running an earth wire to the preamplifier ground
directly from the turntable's normal ground. In most applications the
P75 will not need to be earthed.
P75 mk3 Jumper Location and Settings
High output MC or Moving Magnet and special 1mV MC
JB7 & 8 Gain setting
Normal (40dB)
High (46dB)
1mV Cartridge
Low output MC - standard phono mode
JB3 & 4 Gain setting
Normal (60dB)
Key blank = no jumper
= fit jumper
= no effect, jumper may be fitted or left off
For more information visit www.dynavector.com.au
All the above adjustments are easily made by the user. No soldering or extra
components are required.
Standard Settings
When delivered from the factory,theP75issettothefollowingstandard settings:
Low output moving coil 100 ohm 63dB gain. Shown above.
Phono Enhancer mode (Low output MC)
JB 3 & 4 Output level
Set jumpers to suit coil resistance*
Low resistance
approx 4-10Ω
Medium resistance
approx 10-20Ω
High (63dB)
JB1 & 2 Cartridge loading
470 Ω 220 Ω 100 Ω 60 Ω 30 Ω
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 will be
sorely missed, we shall continue to follow his clear guiding principles.
Haere ra John.
High resistance
approx 20-50Ω
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.
See www.dynavector.com for complete Dynavector cartridge specifications.
www.dynavector.com.au
Designed and manufactured in Australia by
Dynavector AmplifiersAustralia
© Dynavector SystemsAustralia Pty Ltd2012 P75 mk3manual rev1.0 PDF version
Loading...