HP 500 SE manual
HP 500 SE
INTRODUCTION
Congratulations and thank you for choosing the OCTAVE
HP 500 SE
limited edition
You are about to enjoy the benefits of one of the world's most innovative and
reliable amplifiers. Take care of it, and your amplifier will provide you with many
years of listening pleasure.
You often hear people claim that there has been no real progress in tube
amplifier design for years. The operating principles of tubes have been
documented extensively and are well known to amplifier designers. The same
can, of course, be said for transistor amplifiers.
Nevertheless, there is still room for further development with both of these
technologies. This is both necessary and desirable. With tube amplifiers in
particular, a general reluctance to depart from the classic circuit designs has not
done the technology any favours. Today's loudspeakers and source equipment
provide better performance than ever before, but also make greater demands on
amplifiers. Modern sound reproduction equipment delivers a level of performance
at a price that simply would not have been possible 20 or even 10 years ago.
These advances have been achieved through the application of cutting edge
technology as it becomes available and affordable.
Integrating these technologies into amplifier design demands a detailed
knowledge of the inner workings of amplifiers and an appreciation of the sonic
ramifications of each modification.
We have specialized in tube amplification for the past 20 years, during which
time we have developed a number of innovative technologies that have earned
us a reputation as one of the leaders in the field.
We hope you will enjoy many hours of wonderful music with your OCTAVE
amplifier.
Andreas Hofmann
3
OWNER'S CERTIFICATE
The exclusive Octave HP 500 Mk III Jubilee Edition has been revised and
refined in numerous ways in response to suggestions made by the editorial
team at Stereoplay magazine. This version was approved by the editorial
team following exhaustive listening tests. The sonic performance of each of
the 99 Limited Edition units far exceeds that of the standard models.
We trust that this product will provide you with many years of listening
pleasure.
4
CONTENTS
Page
Introduction
Owner's Certificate
1.
1.1.
1.2.
OCTAVE technology ...................................................................
Differences to other tube amps ...................................................
Description....................................................................................
7
7
8
2.
2.1.
2.2.
2.3.
Safety instructions ........................................................................
Before you begin ..........................................................................
Placement.....................................................................................
Warranty .......................................................................................
9
9
10
10
3.
3.1.
3.2.
Setting up .....................................................................................
Connecting the amplifier...............................................................
Running in ....................................................................................
11
11
11
4.
Operation: Front panel ................................................................
12
5.
Connections: Rear panel .............................................................
14
6.
6.1.
6.2.
6.3.
The outboard power supply .........................................................
Description....................................................................................
Rear panel for 230/115 V grounded mains ..................................
Rear panel for 100 V ungrounded mains .....................................
15
15
16
17
7.
Programmable remote control......................................................
18
8.
8.1.
8.2.
8.3.
8.4.
Tubes
Tube layout ..................................................................................
Removing the grille.......................................................................
Replacing tubes............................................................................
Tube service life ...........................................................................
19
20
21
21
9.
9.1.
9.2.
Option: Phono MM/MC.................................................................
Description....................................................................................
Adjusting the MC input .................................................................
22
22
23
10.
Troubleshooting............................................................................
24
11.
Technical data and dimensions....................................................
25
12.
Specifications ...............................................................................
27
5
1. OCTAVE TECHNOLOGY
1.1. OCTAVE amps in contrast to other tube amplifiers
Sound
1. The design goal of OCTAVE amplifiers is honest, natural sound
reproduction. The sound characteristics of an amplifier are derived from
the sum of all its parts. Tubes do not themselves guarantee high quality
sound.
Amplifier
Design
2. The limitations of classic tube designs are evident as soon as you
connect the speakers. These designs often only perform to their full
potential when they are used with special loudspeakers. OCTAVE
amplification and power supply technology has largely overcome these
well-known problems. Thanks to their unique output stage design, they
will maintain their optimum sound quality with virtually any loudspeaker,
irrespective of its load.
Control +
Monitoring
3. OCTAVE employs the latest electronic circuit designs to create the
best possible operating conditions for the tubes, and thus for the
amplifier itself.
OCTAVE Tube Technology
PowerManagement
Power supply
and
other functions
Amplifier +
Sound Quality
OCTAVE amplifiers are equipped with a proprietary control and
monitoring system we call Power Management. This is an "electronic
brain" within the amp that regulates and controls all of the amplifier's
functions. It includes the Soft Start Electronics that gently ramp up the
heating and supply voltages to save wear and tear on the components.
In the event of a problem, the Power Management's protection
system will disconnect the unit from the power supply. Power
Management helps us to achieve a completely consistent sound while
at the same time ensuring the total reliability of our products.
Hand built
4. OCTAVE amplifiers are hand built and individually tested. They are
designed and developed by Andreas Hofmann. The company has its
own winding department, in which all transformers are specially custom
wound for each amplifier.
made in
Germany
5. OCTAVE amplifiers are 100% built in Germany. Our employees are
highly qualified and committed. We collaborate closely with local
specialist subcontracting companies. The hardware components are all
manufactured on modern CNC machines.
7
1. OCTAVE TECHNOLOGY
1.2. Description HP 500 SE
Negative
feedback
Tubes
Bandwidth
Stabilized
power supply
Power
Management
Gain switch
True
symmetry
Switchable
phono
The HP 500 SE Line is a two-stage tube amplifier with overall negative
feedback. Amplifiers with feedback make ideal preamplifiers. Feedback
reduces the sensitivity to manufacturing tolerances to a negligible level and
also produces a low impedance output. Unless the output impedance of the
line stage is kept to below 200 ohms, dynamics are compromised and fine
detail is lost.
In the HP 500 SE, an ECC 82 is responsible for the input section of both
channels, with 2 x EF 184 (D 3A) wide-bandwidth pentodes in the output. The
tubes operate in class A. Their extremely low impedance allows them to
deliver a high output current.
The SE version differs from the standard HP 500 in the way its output
configuration has been dramatically overdimensioned. There are also major
differences in the power supply. The output stage has been designed for
maximum bandwidth with a view to extending the low frequency response
downwards rather than extending the upper frequency limit.
As a result, this amplifier reproduces bass instruments with great definition
and authority - without a trace of bloom. The ability to reproduce
fundamentals cleanly is a prerequisite for a natural midrange, and a high
upper frequency bandwidth is important for consistently low distortion. The
designer's intention is that the amplifier should not add any colouration of its
own to the sound. The bandwidth of the line stage extends from 0.2 Hz - 2.3
MHz, +0 - 6 dB at low gain.
The power supply has now been fitted with electronic stabilization throughout.
A low noise floor is only possible when the supply current is absolutely clean.
We therefore use MOSFET transistors to regulate the high-voltage supply.
The heating and auxiliary circuits are also stabilized. All voltages have a
noise and hum component less than 300 µV.
The benefit of all these measures can be seen in the signal-to-noise ratio of
the line stage, which demonstrates an unusually high value of -103 dB
Preamplifier stabilization is integrated with the electronic soft start surge
control (Power Management). Soft start, which carefully ramps up the heating
and supply voltages, is extremely important in extending the life of the tubes
and maintaining a consistent sound from the tubes. It also relieves the power
supply components of the strain of handling huge surge currents at turn-on
and assists the tubes in achieving a service life as long as 10 years.
You can adjust the gain of the line stage in the HP 500 SE. This means you
can tailor the effective adjustment range of the volume control to suit your
particular power amp-loudspeaker system.
Also new is the transformer-coupled XLR output. The only way to achieve
true, fully floating balanced signals is with a transformer. Balanced inputs
depends on the + and - signals being exactly 180 degrees apart. This is
where audio transformers come into their own because transformer coupling
can provide two perfectly out-of-phase signals from the very lowest
frequencies up – without introducing any group delay distortion.
Another advantage of transformers is that they provide galvanic isolation,
which makes it impossible for earth loops to develop between the
preamplifier and power amplifiers or active loudspeakers.
Phono input
The HP 500 SE can be supplied with an optional phono preamp, providing
separate inputs for MM and MC. The input impedance for MC is adjustable
between 37 and 500 ohms.
8
2. SAFETY INSTRUCTIONS
2.1. Before you begin
Before using your HP 500 SE, please check your local line voltage and pay attention to this manual
In case of emergency: disconnect the plug from the mains supply
Never use an amplifier that is damaged or faulty. Make sure that it cannot be used until it has been
repaired by a qualified service engineer.
Make sure that there is easy access to the IEC socket and power cord.
Do not open the case
There are dangerously high voltages and hot tubes inside this equipment. To avoid a burn or the
risk of electric shock, never allow anyone except qualified personnel to open the case or remove
the grille.
Servicing and maintenance
For reasons of safety, please ensure that servicing, repairs and other modifications to OCTAVE
equipment are carried out only by a qualified technician. Fuses should also only be changed by a
qualified technician. Always replace fuses with ones of the same type and rating. If your amplifier
requires servicing, please ship or take your equipment directly to OCTAVE or to one of our
authorized service centres.
Explanation of the warning symbols:
The exclamation point within an equilateral triangle is intended to alert the
user to important operating and maintenance instructions.
The lightning flash with arrowhead symbol within an equilateral triangle is
intended to alert the user to the presence of uninsulated 'dangerous
voltages' within the product's enclosure that may be sufficient to constitute
a risk of electric shock to persons.
Before connecting
Make sure that the voltage of your amplifier matches your electricity supply voltage.
Grounding
This amplifier is a protection class 2 device (without an earth conductor).
9
2. SAFETY INSTRUCTIONS
2.2. Placement
1. Location
OCTAVE equipment is designed strictly for use in a dry domestic environment. Do not use it in the
open air or in damp environments!
Never place plants or liquid filled containers on your OCTAVE equipment. Take care that objects
do not fall or liquids are not spilled into the enclosure. Should this happen, remove the mains plug
immediately and have your amplifier checked by a qualified service technician.
Condensation may form if the amplifier is taken from a cold environment into a warm one. If you do
this, wait until the amplifier has reached room temperature and is dry before switching it on.
Avoid installing the unit close to sources of heat such as radiators or anywhere that it may be in
direct sunlight.
Do not operate the unit near flammable materials, gases or vapours. Avoid areas where there may
be heavy accumulations of dust or where the unit may be subject to mechanical vibration.
Place your OCTAVE amplifier on a stable, even surface.
2. Cover
Never operate the amplifier without the cover.
3. Ventilation
Make sure that your amplifier has a good flow of air around it. If you intend to install your
equipment in a cupboard or a shelf unit, ensure that there is at least a ten centimetre gap between
the ventilation slots and the walls all around the amplifier. Do not rest the equipment on a soft
surface such as carpet or foam sheeting.
2.3. Warranty
OCTAVE can only guarantee the safety, reliability and performance of this unit if modifications and
repairs are carried out by specialized personnel and if the amplifier is operated in accordance with
the instructions contained in this manual.
10
3. SETTING UP
3.1. Connecting the amplifier
1.
In your own interest, please observe the safety precautions and positioning advice
(Chapter 2)
2.
Before connecting your OCTAVE amplifier up, switch off all the other equipment that you
intend to connect to it. This will avoid a source of possible problems when you plug these
components in.
3.
Connect the inputs from your amplifier to the appropriate outputs on the HP 500 SE amplifier.
4.
Connect your loudspeakers to your power amplifier, making sure that you observe the correct
polarity (positive on the amplifier to positive on the speakers).
5.
Check that the amplifier is switched off before connecting the power cable to the wall socket.
6.
The stand by/power rotary switch for the HP 500 SE is located on the front panel (see Chapter
4, Operation)
7.
Check that the volume control is not set at maximum before playing music through the
amplifier.
8.
Switch on the mains power, the push-button-switch is located on the rear panel
of the power supply.
The preamplifier needs approx. 4 minutes warm up time. In the warm up
time the output is shorted to ground to avoid disturbances.
When switching the mode switch from normal to - 6 dB gain operation, the
output is muted for approx 2 minutes.
If you switch from high to low or vice versa the muting time will start
again
9.
Switch on the other components.
3.2. Running in
All OCTAVE equipment is subject to a 48-hour soak test at the factory to burn in the tubes. The
tubes are preselected for use in each particular model.
The sound quality of tube equipment improves throughout the initial running-in period of up
to three months.
During this time, daily use is beneficial (even at high levels) but not a requirement. Continuous
operation does very little to help reduce the running-in time and is therefore not recommended.
11
4. OPERATION - Front panel
HP 500 SE
Muting
Stand by
Volume
Disc
On
Gain Low
Gain High


Power (standby switch)
Muting gain switch
Aux
Source
Tuner
Tape
Phono
The LED above the switch illuminates when the power is
on. When it is switched off here, the amplifier remains in
standby mode with certain sections of the amplifier still
operational. When the preamplifier is switched on, the ON
LED will also illuminate. If you do not intend to use the
preamplifier for a while, switch the unit off using the on/off
switch on the outboard power supply.
This rotary switch has two functions and three positions.
First, it changes the gain of the line stage. The setting is
shown by the "low" and "high" LEDs. You can also use this
switch to activate the muting function. The LED above the
switch illuminates when the muting is on.
The muting function short-circuits the preamplifier outputs.
Use the muting feature whenever you plug or unplug cables
to or from the preamplifier, as it isolates the preamplifier
outputs from the power amp, allowing you to swap cables
without switching the preamplifier off.
When using the muting function, you should also turn
the volume control to zero.
Use the low/high gain setting to adjust the preamp output to
suit the efficiency of your loudspeakers and increase the
sensitivity of the volume control.
When you change the position of the switch, the muting
function automatically activates to avoid sending
switching noises to your speakers.
12
4. OPERATION - Front panel

Volume control

IR sensor
The infrared receiver is located below the volume control.
Make sure that this area is not covered.

Tape/Source switch
Switch in Source position: The LED above the input selector
 knob illuminates to show which source has been selected
(Disc, Aux, Tuner or Phono).
Switch in Tape position: The LED above the Tape/Source
switch  illuminates to show that tape playback has been
selected. While your tape machine is recording, you can
carry out off-tape monitoring, i.e. you can monitor the actual
recording off-tape as you are making it. For more information
on this facility, refer to the instruction manual for your
cassette recorder, DAT, etc.

Input selector switch
When the LED above the input selector rotary switch
illuminates (Tape/Source knob  switched to Source), your
preamplifier will play your selected source:
Disc
CD playback
Aux
Input for an additional line level device.
Tuner
Radio or tuner playback
Phono
Line version: line level input for an external phono
preamplifier.
Phono version: playback of MM or MC (see rear
panel diagram)
You can record the source you are listening to via a recorder
connected to the REC output on the rear of the HP 500.
Please note:
The HP 500 SE is fitted with a switch-on delay. This increases the life of the tubes and
suppresses switch-on noises, as the output of the preamplifier is muted during the switch-on
process. At the end of the 4-minute delay, the output is enabled and the LED above the Tape or
Input Selector switch will illuminate, depending upon the position of the Tape/Source knob.
13
5. CONNECTIONS: Rear panel
.










.
Subsonic filter
Left position - off, right position - on
Phono selector switch
(MM/MC version only)
The toggle switch selects the MM or MC input
MC input
Input for moving coil pickup
GND
Ground (earth) connection
For connecting an earthing wire to the turntable (if
required). See also the section "Connecting to your
stereo system"
MM input
Input for moving magnet pickup
Tuner input
AUX input
Input for video, TV, etc.
CD input
Tape rec
Tape play
Output to tape machine
Input from tape machine
OUT 1 + 2
RCA phono outputs to the power amplifiers
XLR output
For balanced power amplifiers
Power connector
for the outboard power supply
Comment:
In the connection area, the lower socket line (red) is for the right
channel, the upper socket line (white) is for the left channel.
Pin configuration XLR-sockets: : 1 = ground, 2 = plus, 3 = minus
14
6. OUTBOARD POWER SUPPLY
6.1. Description
Indicator LED
The LED illuminates when the unit is switched on.
The HP 500 SE is equipped with a specially designed external power supply incorporating highly
effective mains and high frequency filters. To provide maximum shielding from electromagnetic
interference, the unit is housed in a separate case. The transformer has been specially designed
for the HP 500 SE. It cannot be used with any other device.
Benefits
The Power Supply contributes substantially to the improved sound quality of the HP 500 SE. Its
design is based on the realization that an effective improvement in sound quality can be achieved
by completely isolating the preamplifier from the mains (simulated battery powered operation).
Classic LC filters can reduce high frequency interference but cannot reduce low frequency
interference or ground currents that are part and parcel of a "normal" power supply. Ground
currents are interference currents in the signal cables connecting the various components in a
stereo system. They have a definite negative effect on sound quality.
We developed a special isolation transformer that also demonstrates very good high frequency
filtering characteristics. We have been able to eliminate these ground currents by completely
isolating the components from the mains.
15
6. OUTBOARD POWER SUPPLY
6.2. Rear panel for 230/115 V grounded mains

On/off switch
Switch the unit off using this switch if you do not intend to
use the preamplifier for some time.

AC input
three-pin IEC receptacle:
A power cable is supplied with your preamplifier.

Fuse holder
230 V mains: 0.63 A time-lag fuse.
115 V mains: 1 A time-lag fuse.
Fuse type:
EN 60127-2/5
Changing the fuse should be left to a qualified service
technician!

Preamplifier connecting cable (120 cm)
Plugging in. When plugging in the connector, observe the
anti-rotation lug and take care not to overtighten the
coupling ring!
16
6. OUTBOARD POWER SUPPLY
6.3. Rear panel for 100 V mains (ungrounded)

On/off switch
Switch the unit off using this switch if you do not intend to
use the preamplifier for some time.

Fuse holder
100 V mains: 1,6 A time-lag fuse.
Fuse type:
EN 60127-2/5
Changing the fuse should be left to a qualified service
technician!

AC input
two-pin IEC receptacle:
A power cable is supplied with your preamplifier.

Preamplifier connecting cable (120 cm)
Plugging in. When plugging in the connector, observe the
anti-rotation lug and take care not to overtighten the
coupling ring!
17
7. PROGRAMMABLE REMOTE CONTROL
Device selector OCTAVE code B
Volume up
Volume down
Select your OCTAVE amplifier on the touch screen panel with button AUX.
Once selected you can always control the volume directly by pushing the button
Vol + or Vol - .
Detailed information relating the use of the remote control you find in the owner's
manual of the HOME THEATRE MASTER REMOTE
18
8. TUBES
8.1. Tube layout
Before opening the cover it is mandatory to remove the power cord
from the mains power inlet.
Line board:
Phono board:

+



ECC 82 / 12 AU 7
EF 184
ECC 83 / 12 AX 7
ECC 81 / 12 AT 7
ECC 88 / 6922
19
8. TUBES
8.2. Removing the grille
First, switch the unit off and remove the mains plug from its wall socket.
1.
Remove the two Allen bolts located at the top left and right of the front panel using a
size 4 Allen key.
2.
Insert a Philips no. 1 screwdriver through the grille at the rear of the unit, and undo the
two Philips screws at the left and right. These screws have retainers to prevent them
being removed completely. You will need a screwdriver with a shaft that is long
enough to reach through the grille.
3.
Lift up the cover.
20
8. TUBES
8.3. Replacing tubes
Please use only original OCTAVE replacement tubes. These have been selected and tested for
use in our amplifiers. Important! Changing tubes is a job for a qualified technician!
1.
Switch off the preamplifier, unplug the power cord from the wall socket, and allow the unit
10 minutes to cool down.
2.
Please refer to the drawing 8.2. Removing the cover
3.
Take out the old tubes.
Carefully remove the tubes from their sockets, taking care not to exert sideward pressure
on the sockets.
4.
Fit new tubes
Please ensure that the tube pins are all perfectly straight before inserting your new tubes.
Straighten any bent pins very carefully by hand if necessary.
5.
Cleaning tips
Cleaning agents and contact cleaners are not recommended for tube sockets. Clean dirty
sockets with compressed air and carefully clean tarnished tube pins using a wire brush.
6.
Please note:
No adjustments are necessary to your amplifier after fitting new tubes.
It may take new tubes some time (up to 300 hours) to achieve their optimum sound
quality.
Manufacturing faults in tubes may only become evident after about 100 hours of use. You
should therefore be wary of installing untested tubes. However, faulty tubes or tubes of
the incorrect type will normally not damage the amplifier.
8.4. Tube service life

Thanks to the protection circuits and soft start electronics, the output tubes used in your
amplifier should achieve an average service life of 10 years.

Because the tubes have different service lives, it should never be necessary to renew the
entire tube complement at the same time.
21
9. PHONO MM/MC OPTION
9.1. Description
The role of the phono preamplifier
A record player is an electro-mechanical device. Music signals are "pressed" into the grooves in
the record, and these are physically tracked and read by the pickup cartridge. In order to get the
entire 20 Hz - 20 KHz frequency range into the grooves, the frequency response has to be
shaped by lowering the level of the low frequency information and raising the level of the high
frequency information. This predefined equalization curve is known as RIAA equalization.
A phono amplifier must exactly equalize for RIAA recording characteristic if it is to avoid
colouring the sound. Equalization accuracy must be within 0.5 dB over the entire frequency
range, with channel matching of at least 0.1 dB.
The phono section of the HP 500 SE
The phono section of the HP 500 SE is an enhanced version of our hybrid phono technology.
The phono section now offers a greater level of compatibility with low output and low impedance
moving coil cartridges. Most preamps have problems with such cartridges, since both gain and
input impedance issues have to be addressed simultaneously.
We have developed an MM/MC head amp that successfully eliminates the problem areas. At
the heart of the equalizer is a tube circuit containing 3 tubes. It incorporates a switchable
subsonic filter, which prevents very low frequencies generated by warped records or tonearm
resonances from overloading the loudspeakers. 
Guidelines for connecting to the phono section
1
Plug the RCA phono cable from your turntable into the appropriate (MC  or MM ) input
on your HP 500 SE. Turn the input selector  to phono.
2.
Connect the earth cable supplied with your turntable to the GND connection on the
HP 500 SE , following the instructions provided by the turntable/arm manufacturer.
Some tonearms do not have a separate earth cable, as the pickup system is earthed via
the RCA phono plugs.
Explanation:
The earth is generally connected to the tonearm or the headshell. This is necessary to
prevent hum or radio interference. It is usually advisable to connect the earth cable to
reduce this kind of interference.
22
9. PHONO MM/MC OPTION
9.2. Adjusting the MC input
Before you can adjust the MC input, you need to remove the grille from your preamplifier (see
"Removing the grille").
Slider switches for MC input impedance
Left channel
Switch 1 – 4
Right channel
Switch 5 - 8
Switch option
Switch
no.
Switch
position
Resistance
(ohms)
Switch
no.
Switch
position
Resistance
(ohms)
1
2
3
4
5
6
7
8
9
10
11
All
1
2
1+2
3
1+3
2+3
4
2+4
2+3+4
All
Off
On
On
On
On
On
On
On
On
On
On
500
330
200
166
97
88
75
70
58
40
37
All
5
6
5+6
7
5+7
6+7
8
6+8
6+7+8
All
Off
On
On
On
On
On
On
On
On
On
On
500
330
200
166
97
88
75
70
58
40
37
The input impedance setting is important in achieving a balanced sound from your pickup. You will
find the recommended impedance in the specifications supplied with your pickup.
Default factory setting: 97 ohms
23
10. TROUBLESHOOTING
 Hum and crackling
Hum in an audio system is often caused by several system components being earthed
individually. It is particularly common with tuners, VCRs or satellite receivers, where the earthed
aerial cables cause a hum loop via the aerial input. Power amplifiers are normally also earthed.
Removing the earth wire on your mains plugs is not a solution. You can isolate the aerial earth
connection with a special signal isolator. This device has no adverse affect on the sound or
picture quality of tuners or TVs.
The HP 500 SE is not earthed (only the power supply is earthed) and cannot therefore
cause ground loops.
 Clicks and pops
Older fridges and 12 V halogen lamps can cause cracking through the loudspeakers when they
switch on and off.
Solution: the only solution is to use a single power socket board for your entire system and to
use a different power outlet in your listening room.
 Channels are not balanced
Check that the phono plugs are a tight fit. Bend the outer earth contact inwards slightly if
necessary. Sometimes the internal pin in a phono plug may not be a tight enough fit, in which
case you should change either the interconnect or the socket.
1.
Damaged cables and poorly fitting phono plugs can create resistance in the signal path,
enough to reduce the output level of one channel.
Solution: Try new cables or clean plugs and sockets with isopropyl alcohol. You could also
try cleaning or contact fluid.
2.
A faulty tube can cause a drop in output in one channel and generate distortion. Although a
rare occurrence, the heater inside the particular tube may be the cause of the problem.
Solution: Replace the tube.
 Increased hiss on one channel
Hiss that varies in level is a sign of a faulty or worn driver tube.
Solution: Replace the worn tube.
24
11. TECHNICAL DATA AND DIMENSIONS
In- and Outputs
Inputs
Outputs
6 x RCA (two of them are phono MM/MC with the
option phono, without phono option the MM-input is
line level, the MC-input is not mounted
Bypass-Function for input Tape play is on request
2 x RCA, 1 x XLR, 1 x Tape Record (RCA)
Line stage
Gain high
Gain low
Frequency response
Total harmonic distortion
Signal-to-noise ratio: high gain
Signal-to-noise ratio: low gain
Channel separation
Crosstalk rejection between inputs
Input impedance
Output impedance
Channel tracking of volume control
Pin allocation, XLR output
17.5 dB = 7.5
9.5 dB = 3
3 Hz - 500 kHz 1.5 dB
0.001% at 3V / 7.5 kOhm
- 92 dB
- 103 dB
65 dB 1 kHz
- 86 dB 10 kHz
100 kOhm
100 ohms (RCA phono)
2 x 50 ohms XLR
0.5 dB - 70 dB
Pin 1: ground
Pin 2: + (hot)
Pin 3: - (cold)
Phono MM
Input impedance
Sensitivity
RIAA equalization accuracy
Gain
Signal-to-noise ratio (weighted)
Subsonic filter corner frequency
47 kOhm º 130 pF
3 mV
0.3 dB 15 Hz - 20 kHz
40 dB 1 kHz
- 73 dB
20 Hz / - 3 dB
Phono MC
Input impedance
Sensitivity
Gain
Signal-to-noise ratio (weighted)
37-500 ohms
0.1 mV
30 dB
- 75 dB
General:
Power consumption
Weight, preamplifier
Weight, power supply
Dimensions, power supply (W x H x D)
Standard accessories
50 VA
10 kg
4 kg
18 x 10 x 28 cm
power cable, remote control
25
11. TECHNICAL DATA AND DIMENSIONS
Overall dimensions of the preamplifier in mm
147
139
393
ca. 460
HP 500 SE
147
435
Features









The HP 500 SE is fitted as standard with two RCA phono outputs and one XLR outputs.
The XLR output is transformer-coupled and galvanically isolated.
The HP 500 SE has separate inputs for MM/MC.
An optional phono MM and MC module may be added any time.
MC input impedance is adjustable over a wide range.
Soft-start for heaters, operating voltage and signal output. This results in maximum
service life of the tubes and noise-free switch-on/off. The output is enabled after 4
minutes.
The line stage has two switchable gain settings
Standby function to minimize power consumption and reduce startup time (for periods up
to several hours).
Outboard power supply with multiple screened mains transformer and built-in mains filter.
26
12. SPECIFICATION
Diagrams
Frequency response accuracy of line stages in 'low gain' setting.
20 Hz - 200 kHz: 0.1 dB
Overall distortion (THD + noise) of line stage from 20 Hz - 200 kHz.
Distortion remains low up to 20 kHz
27
12. SPECIFICATION
Diagrams
Noise spectrum of line stage, 4 V output at 1 kHz. The low level of
harmonic distortion and low noise level are clearly visible. There
are no hum components at 50 Hz and 100 Hz.
Frequency response of the phono stage with and without
subsonic filter
28
We reserve the right to alter and improve the
specifications in pursuit of better. OCTAVE
logo is a registered trade mark of Andreas
Hofmann. Copyright by Andreas Hofmann.
Reproduction in whole or part is prohibited.
edited
EN2010
OCTAVE AUDIO
Germany
www.octave.de
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