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Dynavector P-75
phono pre-amplifier
and phono enhancer
Instructions and Specifications
www.dynavector.com
Designed and manufactured by
Dynavector Australia and New Zealand / Aotearoa
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The P-75 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 P-75 power supply is totally self contained and stores many
times the maximum possible energy requirements for 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.
There are no input or output coupling capacitors in the P-75 signal path.
The P-75 incorporates the unique current amplifier invented by Dr Tominari
of Dynavector Systems Ltd., Japan, called a Phono Enhancer.
Note: The P-75 supply requires a higher peak current to start up and so
we do not recommend using an adaptor of less than 500mA.
The P-75 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.
An earth terminal is provided on the rear panel that will allow the metal
chassis to be connected to earth if required.
While the P-75 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 pre amplifier ground.
In some applications, the P-75 may need to be earthed.
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P-75 power supply requirements
AC to DC power adaptor 12V 500mA DC
Two pin adaptor centre negative outer positive
Outer Diameter 5.5mm
Inner Diameter 2.5mm
Note: Power supply is not included.
Please purchase a suitable supply at your local dealer.
Specifications
The P-75 is a stand-alone phono to line level amplifier. It can operate with the following cartridge
types:
Cartridge Type Input Sensitivity Gain Loading
Low Output Moving Coil 0.2mV (200µV) or 60 & 63dB 30, 100, 470 ohms
Standard phono stage 0.15mV (150µV)
Low Output MC Zero ohms
Phono Enhancer*
High Output Moving Coil 2mV 40dB 47k (47,000) ohms
Moving Magnet
Moving Iron
*Input sensitivity and gain is determined mainly by the cartridge internal resistance.
Three resistance/gain adjustments available.
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P-75 Jumper Diagram
Output
RCA plugs
Rear Panel
Input
RCA plugs
All the above adjustments are easily made by the user. No soldering or extra components
are required.
Always turn off power to the audio system (including power to the P-75) when altering
jumpers or settings inside the P-75.
NOTE: Under no circumstances should a signal generator be used with the phono enhancer
circuit, as any excessive current from the generator may damage the P-75.
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P-75 Jumper Settings
High Output MC JB1 & 2 JB3 & 4
or MM 1-2 open 1-3 2-4
3-4 open short short
5-6 x
7-8 x JB5 & 6
1-2 2-3
short open
Low Output MC
Standard phono JB3 & 4 JB5 & 6
1-3 2-4 1-2 2-3
60dB gain (normal) short short open short
63dB gain (high) open short
JB1 & 2
Cartridge loading 470 ohm 100 ohm 30 ohm
1-2 open open open
3-4 short short short
5-6 open short short
7-8 open open short
Phono enhancer JB1 & 2 JB5 & 6
(current amplifier) 1-2 short 1-2 2-3
3-4 open open short
5-6 short
7-8 short
JB3 & 4
1-3 2-4
Low resistance coil open short
Med resistance coil short short
High resistance coil short open
Key
open = remove jumper
short = fit jumper
x = jumper can be in any position
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P-75 jumper position examples
open = remove jumper short = fit jumper any position
Moving Magnet and
High Output Moving Coil
Low Output Moving Coil
63db gain, 100 ohm loading
Phono Enhancer
Medium resistance coil
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IMPORTANT SAFETY INSTRUCTIONS
Read Instructions
All the safety and operating instructions should be read before using this
product.
Retain Instructions
The safety and operating instructions should be retained 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 of the type of power supply, consult
your dealer.
Servicing
Refer all servicing to qualified service personnel.
Warranty
Dynavector manufactures its products to very high standards and we are
confident our products will perform well. Accordingly, we warrant the Dynavector
P-75 against manufacturing defects in material and workmanship to the
original owner, for a period of one year from the original date of purchase.
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 puchases 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. This warranty is non-transferable.
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