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Octave HP 700, Manual

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Octave HP 700 Manual Download Page 21

 

 

 
 

OUTPUT RESISTANCE 

Adjusting the output resistance 

 
 
 

 

 

21 

 

  OUTPUT RESISTANCE 

 Adjusting the output resistance 

 

 

To change the output resistance of the line stage, set the resistance switch to LOW (100 ohm) or 
HIGH (300 ohm). 

This allows you to adapt the preamplifier to the properties of the signal cable and the input resistance 
of the power amplifier. For power amplifiers with an input resistance under 10 kohm and cable lengths 
of 3 m and upward, select the setting LOW. 

The output resistance influences the sound quality significantly. In the LOW setting, the sound pro-
duction is very direct and contoured due to the line stage’s higher capacity to supply power. 

The  setting  primarily  affects  the  RCA  output;  the  XLR  output  is  sufficiently  low-resistance  at 
150 ohms. 

The factory setting for the resistance switch is LOW. 

 

 

Resistance selector switch 

Summary of Contents for HP 700

Page 1: ...HP 700 ...

Page 2: ...rom the classic circuit designs has not done the technology any favors Today s loudspeakers and source equipment pro vide better performance than ever before but also make greater demands on amplifiers Modern sound reproduction equipment delivers a level of perfor mance at a price that simply would not have been possible 20 or even 10 years ago These advances have been achieved through the applica...

Page 3: ...rnings 7 2 1 5 Before connecting 8 2 1 6 Grounding 8 Placement 8 2 2 1 Location 8 2 2 2 Cover 8 2 2 3 Ventilation 8 Warranty 8 3 SETTING UP 9 Checking the delivery contents 9 Connecting the amplifier 9 Running in 9 4 OPERATION 10 HP 700 front panel 10 5 CONNECTIONS 11 HP 700 rear panel 11 6 EXTERNAL POWER SUPPLY 13 Front of power supply 13 Rear of power supply 13 7 MULTI CHANNEL MODE 14 The HP 700...

Page 4: ... 24 11 2 1 HP 700 with phono RIAA 24 11 2 2 Subsonic filter 25 11 2 3 Assembling the phono input modules 26 11 2 4 Available phono input modules see inlay manual In and Output Modules 26 Option HP 700 with control unit 27 Option HP 700 with stepped attenuator 29 12 TROUBLESHOOTING 30 Troubleshooting 30 13 TECHNICAL DATA 31 In and outputs 31 Dimensions 33 13 2 1 HP 700 preamplifier dimensions in mm...

Page 5: ... and thus for the amplifier itself OCTAVE tube technology OCTAVE amplifiers are equipped with a proprietary control and monitoring system we call Power Management This is an electronic brain within the amp that regu lates and controls all of the amplifier s functions It includes the Soft Start Electron ics that gently ramp up the heating and supply voltages to minimize wear and tear on the compone...

Page 6: ... the HP 700 via a relay with a time delay or disconnects it immediately in case of a malfunction Click interferences caused by a loss of power supply etc are therefore ruled out completely The multichannel bypass function makes the HP 700 one of the most versatile preamps in this range see chapter 7 page 14 An RCA or XLR input can be selected for the bypass func tion This set up in the HP 700 is a...

Page 7: ...ses 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 centers 2 1 4 Symbols and terms used in warnings The following warnings symbols and terms are used in this document in compliance with the Amer ican National Standard ANSI Z535 6 2011 The general danger symbol in conjunction with t...

Page 8: ...erature and is dry before switching it on Avoid installing the amplifier close to sources of heat such as heaters or anywhere that it may be in direct sunlight Do not operate your OCTAVE amplifier near flammable materials gases or vapors Avoid areas where there may be heavy accumulations of dust or where the amplifier may be subject to me chanical vibration Place your OCTAVE amplifier on a stable ...

Page 9: ...to positive on the speakers 5 Check that the amplifier is switched off before connecting the power cable to the wall socket 6 Check that the volume control is not set at maximum before playing music through the pream plifier and that the function switch 1 is set to the setting Gain Low Med or High 7 Switch on the HP 700 using the power switch on the power supply See chapter 4 page 10 Note The prea...

Page 10: ...olume control is bypassed This setting is intended for multi channel applications with volume control on the multi channel receiver The bypass HT RCA in put is separate the bypass function can be switched to an XLR input TC On This LED illuminates if the tone control is on only available for control unit option see section 11 3 page 27 Start This LED only illuminates during the two minute start up...

Page 11: ... for a phono or line input module 8 IN 5 RCA input Line level input for CD tuner etc 9 IN 3 XLR input Balanced line level input for CD DAC etc 10 IN 6 RCA input Line level input for CD tuner etc 11 IN 7 RCA input Line level input for CD tuner etc Note On the connector panel the bottom row of sockets red is the right channel while the top row of sockets white is the left channel ...

Page 12: ...fiers 17 Name plate With serial number and version 18 OUT 3 XLR output for balanced power amplifiers 1 ground 2 posi tive 3 negative ground lift XLR With the ground lift the XLR outputs can be isolated from the signal ground for the preampli fier Setting O corresponds to the ground isolation In setting I the ground of the XLR outputs over 3 3 ohms is connected to the preamplifier ground Isolating ...

Page 13: ... supply illuminates when the power supply is on During the start up phase the start and muting LEDs illuminate on the pream plifier After the start up phase the start and muting LEDs go out if the mode switch is not set to the muting setting the device is ready to play music 21 Control light Power on off Rear of power supply Legend 22 Power input IEC socket 23 Serial no and supply voltage 24 HP 70...

Page 14: ...front channels right and left on the multi channel source are connected to the bypass input 13 on the HP 700 if the multi channel device only has RCA outputs If the multi channel receiver also has balanced outputs for the two main channels the bypass multi channel input on the HP 700 can be switched to the balanced input IN 4 12 The signals front left and front right on the multi channel source de...

Page 15: ...multi channel source For the RCA outputs and the balanced XLR output the volume control for the HP 700 is then disabled In this mode the amplification factor of the HP 700 is 0 dB for RCA and XLR Multi channel source DVD player etc Stereo mono power amplifier Front main loudspeaker Three channel power amplifier for the additional channels RCA XLR input L RCA XLR input R ...

Page 16: ...inserting the batteries If the remote control does not work after the batteries are replaced remove the new batteries and wait at least 2 hours You can then re insert the batteries and the remote control should work 4 Replace the base plate taking care not to tighten the screws too much Note After use the batteries we have supplied for the remote control can be returned to the point of sale free o...

Page 17: ...k Before opening the cover switch the device off and unplug the power cord Tube layout line board Tube layout line board V 1 ECC82 12 AU 7 No option to adjust the tubes V 2 3 2 x EF 800 alternative 2 x EF 184 or Jumper setting for position EF Pin1 and Pin2 are bridged 2 x D 3 A alternative E 180 F Jumper setting for position D3 Pin2 and Pin3 are bridged Factory settings V1 12 AU 7 Tung Sol V2 V3 2...

Page 18: ...TUBES Phono tube layout 18 Phono tube layout German designation International designation V 4 ECC 83 12 AX 7 V 5 ECC 81 12 AT 7 V 6 ECC 88 6922 6 DJ 8 ...

Page 19: ... 7 tube Note The control unit cannot be disassembled during tube replacement as it is physically connected to the front 1 Disassemble the shortened cover 2 If your device is equipped with the phono RIAA board first remove the V 6 tube of the phono RIAA board 3 Below the control unit carefully remove the V 7 tube in the direction of the arrow ...

Page 20: ... your new tubes Straighten any bent pins very carefully by hand if necessary 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 or toothbrush Please note No adjustments are necessary to your amplifier after fitting new tubes It may take new tubes some time up to 3...

Page 21: ... of the power amplifier For power amplifiers with an input resistance under 10 kohm and cable lengths of 3 m and upward select the setting LOW The output resistance influences the sound quality significantly In the LOW setting the sound pro duction is very direct and contoured due to the line stage s higher capacity to supply power The setting primarily affects the RCA output the XLR output is suf...

Page 22: ... the transformer coupled IN 8 is to be used for sound or technical reasons 11 1 1 Assembling the additional line level input module 1 Remove the cover of the HP 700 by loosening the screws using the supplied torx pin wrench and pulling off the cover upwards 2 Remove the front panel on slot 1 or 2 on the front of the HP 700 4 M3 x 10 screws 3 Make sure that the screws on the connector are all loose...

Page 23: ...ot on the adapter board on the HP 700 slots 1 and 2 are equivalent The blade terminal cannot be twisted since it can only be inserted in one position The input module ribbon cable plugs only fit in the two outer slots with 4 pins The other slots are reserved for connecting the phono board 8 Close the cover on the HP 700 and tighten the screws 11 1 2 Available line level input modules See inlay man...

Page 24: ...over the entire frequency range with channel matching of at least 0 1 dB The phono RIAA amplifier of the HP 700 must always be supplemented with an input module A maximum of two phono input modules can be installed The input modules function in the same way as an input amplifier that raises the different signals of the pickup cartridge to a constant high level which the RIAA amplifier can optimall...

Page 25: ...ncy levels can be attenuated with the switchable subsonic filter The corner frequency is outside of the audible range at 15 Hz Condition on delivery Subsonic filter on Phono frequency response with and without subsonic filter The frequency range without subsonic filter is very linear and extremely low red graph With the subsonic filter cyan graph bass reproduction is not limited by the low corner ...

Page 26: ...e device off and unplug the power cord 1 Loosen the M4 torx screws on the cover and pull off the cover plate upwards 2 Loosen the 4 Phillips head screws on the corresponding rear cover panel and remove the cover panel 3 Loosen the screws on the corresponding terminal screw strip 4 Insert the module into the slot so to insert the module pins into the screw connector on the main circuit board 5 Then...

Page 27: ...ncy com pensated attenuators originate from high frequency technology Compared to more simple non compensated variants their ad vantage is that the frequency bandwidth and phase shift are not affected 28 Rotary knob for activating the tone control When the tone control is on the TC LED on the front illuminates When the tone control is off the electronic control system is by passed completely 29 30...

Page 28: ...ections are equally helpful in old muffled and bass weak analog recordings and in new digital productions which sometimes feature a distinct high frequency tending towards sharpness Here corrections of 3 dB truly work wonders Technical data Frequency response 0 dB 10 Hz 140 kHz Total harmonic distortion noise 0 1 Noise voltage 5 µV Setting range 15 dB Control characteristics of the tone control Th...

Page 29: ...ies circuit consisting of individual resistors The stepped at tenuator now senses the connecting points of the resistor ladder The advantages of this solution are obvious thanks to the low tolerance fixed resistors the channel tolerance across the entire control range remains under 0 1 dB The hard gold plated contacts on the switch have an extremely low transfer resistance and thus do not generate...

Page 30: ...rference and when they are switched on and off audible clicks and pops in the system s loudspeakers may occur 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 RCA plugs are plugged in properly Bend the outer ground contacts inward if necessary Sometimes the int...

Page 31: ...gh 98 dB 38 µV at 3 V output voltage Signal to noise ratio Gain Med 104 dB 18 µV at 3 V output voltage Signal to noise ratio Gain Low 110 dB 8 µV at 3 V output voltage Equivalent noise level 14 nV Hz Frequency range Gain High RCA 10 Hz 200 kHz 0 7 dB 0 7 MHz 6 dB Frequency range Gain Med RCA 10 Hz 200 kHz 0 3 dB 1 3 MHz 6 dB Frequency range Gain Low RCA 10 Hz 200 kHz 0 2 dB 2 1 MHz 6 dB Frequency ...

Page 32: ...n and input resistance depend on input module Gain MC Gain Low Pre Out Gain Low 70 dB Med 77 dB High 83 dB Gain MC Gain High Pre Out Gain Low 79 dB Med 86 dB High 92 dB General data Power consumption 35 60 W Weight preamplifier power supply 10 kg 3 8 kg Supplied accessories Power cable remote control Dimensions of preamplifier overall Width x height x depth 462 x 130 x 480 mm Dimensions of power s...

Page 33: ...TECHNICAL DATA Dimensions 33 Dimensions 13 2 1 HP 700 preamplifier dimensions in mm 13 2 2 External power supply dimensions in mm ...

Page 34: ...gain of line stages in Gain Low 12 dB Med 18 dB and High 25 5 dB settings 13 3 2 FFT interference spectrum Comparison of the RCA and XLR interference spectrum No mains interference on either of the in puts the spectrum of the harmonics K2 K3 K4 K5 K6 decreases consistently linearly for both outputs ...

Page 35: ...nse The compensated balance pre control exhibits virtually the same frequency response with all set tings 13 3 4 Line stage hum and noise level No mains interference can be detected during noise level measurement either the noise level de creases linearly by 6 dB for each gain setting ...

Page 36: ... to alter and im prove the specifications in pursuit of better OCTAVE is a registered trademark of Andreas Hofmann This manual is the copyright of Andreas Hofmann OCTAVE Reproduction in whole or part is pro hibited EN2017 ...

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