Prophet Preamplifier Manual
Contents
1. 4 kg 6 kg 5 single ended line level inputs per channel 250mV RMS for rated ouput 250 kohms 14 V RMS 2 single ended Preamp outputs per channel 1 single ended Record ouput per channel A single ended 1 0 V RMS 250 mV RMS input 1 5 ie 1 0 V input 5 0 V output 27 ohms 27 ohms 4Hz 120kHz max output 0 03 rated output 78dB 1 x ECC82 12AU7 per channel 1 x ECC81 12AT7 per channel 35 W 240V 50 Hz suorneor jroodg Q Specifications 8 1 Guarantee Guarantee This chapter contains information on The Guarantee of your Prophet Preamplifier Tube Guarantee Registration Claims under this Guarantee This equipment has been fully tested and a full record of these tests made before despatch from the factory Both the workmanship and the performance of this equipment are except as set out below guaranteed against defects for a period of TEN YEARS from the date of purchase provided that it was originally purchased from an authorised dealer under a consumer sale agreement at or near the recommended retail price The words consumer sale shall be construed in accordance with section 15 of the Supply of Goods Implied Terms act 1973 This guarantee covers both labour and parts and is transferable to subsequent purchasers but the liability of the manufacturers is limited to the cost of repair or replacement at the discretion of the manufacturers of the defective parts and under no circumstances extend2. Front Panel Switching your Prophet On amp Off Playback amp Record Functions Operational Notes 6 Running In Burning in your Preamplifier Tube Information 7 Maintenance Care and Cleaning of your amplifier 7 Troubleshooting 7 Changing Mains Voltage 7 Specifications 8 9 9 1 1 gt CA CA amp dS WwW i 1 1 9 9 Guarantee Claims under the Guarantee 10 Tube Renaissance Contents 1 Conventions This manual uses the following conventions Bold indicates emphasis or a minor heading Italic Bold refers to a sub heading of a chapter This symbol refers to Notes containing important information set off from the text THIS SYMBOL REFERS TO CAUTION MESSAGES AND PROCEDURES WHICH IF NOT OBSERVED CAN LEAD TO DAMAGE OR INJURY Contents 2 Getting Started This chapter contains information on Unpacking your Prophet Pre Amplifier amp Power Supply Your preamplifier is packed in jiffy cell support foam Each unit has end caps for left and right hand sides of the unit Simply remove end caps and remove each unit from the cellophane bag packing should be retained Amplifiers returned under guarantee are only accepted in their original packaging The following items are included in the packaging of a Prophet x Prophet Preamplifier 1 x Prophet Power Supply 1 x XLR Power Supply Connecting Lead 1 x Reference Manual amp Registration Card 1
3. words the number of decibels of feedback and therefore the reduction of distortion damping factor and so on are the same whatever the load So there is something to be said for having an output transformer Perhaps enough has been said to suggest at least that the advantages are not entirely on the side of semiconductors and that points can be made in favour of tubes concerning both performance and convenience in use Semiconductors may produce un welcome effects on over driving so difficult to avoid in practise and not only the output stage but also low level stages are involved in these Tubes have a distict advantage in operation with reactive loads and are easier to cool Even the need for an output transformer is not quite such an unmitigated drawback as it may sometimes seem These may be some of the reasons why a substantial part of the audio amplifier market has stayed with tubes during the transistor era and why there has recently been such a remarkable Tube Renaissance Tube Renaissance 10 5
4. x IEC Mains Leads Your pre amplifier is supplied with the tubes already in place Check through the mesh windows on the top lid making sure that the four tubes have not worked free in transit Getting Started 1 1 Mains Connection Mains Connection Earthing Arrangements This chapter contains information on Connecting the Prophet to the household mains supply Wiring a mains plug UK Earthing arrangements Your Prophet Power Supply plugs into the mains supply via the IEC socket located on the back panel see diagram 1 The power supply has been factory set to the correct mains voltage for your country The voltage setting is marked on the serial badge located on the rear panel of the power supply See diagram 1 Check that this voltage complies with your local supply The wattage rating is also marked on the serial badge uonoouuo SurepA When using a pre power combination it is essential to ensure that no earth loops occur this is when too many earths are connected to the mains earth resulting in a feint low frequecy hum through the system If neccessary you may not need to earth the preamplifier to the mains earth consult the handbook for your power amplifier if you are unsure DO NOT CONNECT SWITCH ON THE MAINS SUPPLY TO THE AMPLIFIER BEFORE COMPLETING ALL OTHER CONNECTIONS IF YOU ARE IN ANY DOUBT REGARD ING MAINS CONNECTIONS PLEASE DO NOT PROCEED ANY FURTHER WITHOUT CONSULTING YOUR DEALER Mains Conn
5. In Burning In Amplifiers Tube Information This chapter contains information on Burning In your Preamplifier Tube Information Burning In is a generic term given to the basic running in of the amplifier You may notice a slight electronic smell from your preamplifier during the first few days of operation This smell is usually caused by various prints and dyes used on the components which takes some time to evaporate This is quite normal and there is no need for concern as your preamplifier has been extensively soak tested before leaving the factory This burning in process continues with your use of the preamplifier This process simply allows for new components like tubes capacitors and resistors to settle and sweeten enhancing the amplifiers sonic performance An estimated 40 hours of operation allows your Prophet this running in period As with all tubes their qualities degrade with age due to cathode emission a natural process common to all tubes A typical life span of a twin triode signal tube as used in the Prophet would be approx 6000 hours after which time they should be replaced thus keeping your preamplifier at it s maximum sonic performance Refer to the Maintenance chapter Running In 6 1 uy Maintenance Care amp Cleaning This chapter contains information on Care and Cleaning of your Preamplifier Troubleshooting Changing Mains Voltage polished metal part
6. PROPHET VGH Ei E Preamplifier amp Power Supply BY TUBE TECHNOLOGY USER S MANUAL TT PART No PrM 02 Printed in England 1st Edition August 1989 2nd Edition March 1994 3rd Edition January 1997 PROPHET CI ZA Preamplifier amp Power Supply USERS MANUAL TT PART No PrM 02 Printed in England ist Edition August 1989 2nd Edition March 1994 3rd Edition January 1997 Introduction Thank you for selecting the Tube Technology Prophet Preamplifier Please read through this manual so you will know how to operate your Prophet Preamplifier properly After you have finished reading this manual please put it away in a safe place for future reference We have done our utmost in the design and build of the Prophet to ensure you a low maintenance trouble free preamplifier that will bring you many years of pleasure as an important part of your hi fi system Please do not forget to complete and return the enclosed registration card We wish you many hours of musical enjoyment ii Contents Getting Started 2 Unpacking your Prophet Pre Amplifier amp Power Supply 1 1 Mains Connection Connecting the Prophet to the household mains supply 2 1 Wiring a Mains Plug UK Du Earthing Arrangements 2 1 3 Installation Installing amp ventilation of your preamplifier 4 Audio Connection Rear Panel Connecting the Prophet s Inputs amp Outputs Connecting the Power Supply 5 Operating your System
7. ce of a loudspeaker system is by no means constant a so called 8 ohm system may well present anything from 4 to 16 ohms over the audio frequency range and be highly reactive at some frequencies It is under reactive load conditions with large signals that another major difference appears between tubes and transistors The combina Tube Renaissance 10 3 tion of simultaneous high voltage drop and high current occurring for brief periods at certain parts of the elliptical load line does not normally affect tubes may cause a catastrophic second breakdown effect in which a permanent short circuit develops not to be confused with ordinary avalanche break down which is a reversible phenomenon The risk of second break down may be avoided by using transistors with sufficiently high ratings to be well clear of the effect if available but the alternative commonly employed is to incorporate protective circuitry that cuts the signal whenever the output transistors are subject to a dangerous combination of voltage and current and this obviously has a very unpleasant effect on the sound The purpose of these remarks is not to denigrate transistor amplifiers but to present a case for tubes and to show that there may be technical reasons for the supposedly subjective effects that have been attributed to transistors Ways may be found of eliminating or obviating these effects in a transistor amplifier design but there is a simplicity ab
8. cement packaging can be purchased from the manufacturers The equipment should not be sent by post DO NOT CONSIGN THE EQUIPMENT TO TUBE TECHNOLOGY UNLESS YOU HAVE FIRST BEEN SPECIFICALLY REQUESTED TO DO SO BY THE MANU FACTURERS TECHNICAL SERVICE DEPARTMENT DO NOT UNDER ANY CIRCUMSTANCES ATTEMPT TO DISASSEMBLE THE EQUIPMENT BEFORE DESPATCH Guarantee 9 2 If you have any difficulty complying with these requirements please contact the manufacturers at the following address TUBE TECHNOLOGY IMAGE HOUSE 326 MOLESEY ROAD WALTON ON THAMES SURREY KT12 3PD TEL 44 0 1932 242420 FAX 44 0 1932 244455 In either case you should state clearly your name and address the date and place of purchase together with a brief description of the fault experienced In the event of equipment being returned which on test is found to comply with the published specifications the manufacturers reserve the right to charge a reasonable fee for testing the equipment and for return carriage The manufacturers are happy to answer any queries you may have regarding the use of this equipment on the condition that this enquiry is by letter You should state clearly the serial number of the unit the dealer from whom it was purchased and the date of purchase THIS GUARANTEE IN NO WAY VARIES OR REMOVES A PURCHASERS STATUTORY RIGHTS Guarantee 9 3 Tube Renaissance Tube Renaissance A possible expalnation of why tubes may sound better than t
9. e affected by such current pulses the result may well be that a brief over driving is followed by a comparatively long recovery signal which would be much more noticeable than mere clipping of peaks Even with dc coupling there may still be capacitors that can cause such extra signals There is a further effect that takes place in the transistor itself because of the phenomenon of charge storage A transistor that has been conducting does not switch off immediately when the forward base bias is removed but continues to take collector current until all the relevant charge carriers that are in transit have been swept out The effect is most pronounced in a transistor that has been turned on hard in fact the larger the base current the longer will be the turn off time In audio transistors that have been over driven this time may be of the order of hundreds of microseconds so this effect can also give rise to spurious signals When it is realised that even the most critical listener cannot detect peak clipping of occasional short loud bursts by as much as 6dB we can understand why it is sometimes said that a 50W tube amplifier can sound equal to some 200W transistor amplifiers A tube amplifier can be quite grossly over driven with little or no subjective effect on sound quality whereas most transistor amplifiers probably cannot The other kind of unintentional wrong operation we have to consider is incorrect oading The impedan
10. ection 2 1 Wiring a Export units for certain markets have a moulded mains plug fitted to comply with local Mains Plug standards If your mains supply lead does not have a plug fitted the coloured wires should be connected to the appropriate plug terminals in accordance with the following code Wire Colour Label on Plug GREEN YELLOW L or EARTH or BLUE N or NEUTRAL or BLACK BROWN L or LIVE or RED If your mains plug has a fuse please fit a fuse with 5A rating If your power supply is not set correctly for the local supply or if you intend to move the amplifier to a location where the supply is at a different voltage it will be necessary to change the voltage switch on the power supply If this is neccessary please refer to changing voltage in the maintenance chapter DO NOT SWITCH ON THE AMPLIFIERS BEFORE COMPLETING THE AUDIO CONNECTIONS IF YOU ARE IN DOUBT REGARDING MAINS CONNECTIONS PLEASE GO NO FURTHER WITHOUT CONSULTING YOUR DEALER Mains Connection 2 2 Installation Installing amp Ventilation This chapter contains information on Installing and Ventilation of your Preamplifier Ensure that the units are placed in a stable location that is able to accept their weight both the preamplifier amp power supply weigh approx 11 kilograms or 5 165 It is not recommended that preamplifier is installed in a cupboard or in any enclosed area if there is not sufficient air space and ventilation to keep it cool A mi
11. fier uses high quality connectors to ensure that maximum signal transfer is possible therefore ensure that all cables used for connection to the preamplifier are terminated with connectors of similar quality See Diagram 1 for Rear Panel layout Connect these outputs to the inputs of your power amplifier If you are using directional cables ensure the arrows point away from the preamplifier Red denotes the right channel and black the left The quality of this interconnect is important for sonic clarity consult your dealer if in doubt These outputs provide an audio output suitable for connection to the RECORD input of a tape deck The source to be recorded is selected by means of the record selector switch on the left hand side of the front panel This terminal is used to ground any inteconnecting leads which have a separate ground connection These inputs are used to connect the audio output of a digital compact disc player or any other audio hi fi component that produces output voltage within the range 150mV 3 V These inputs are used to connect the audio output of a tape deck or audio section of a video recorder or any other audio hi fi component that produces output voltage within the range 150mV 1V These inputs are used to connect the audio output of a tuner or any other audio hi fi component that produces output voltage within the range 150mV 1 V Uuorjoouuo orpny Audio Connection 4 2 Connecting the Power This ouput of
12. here is it all going to end Anyway when setting up an amplifier system one adjusts the gain to give the prefered average sound level One has no way in advance of knowing in advance whether there is an exceptionally loud passage coming that will over drive the amplifier Bursts in excess of 30dB above the average are quite rare If we accept then that occasional over driving is virtually inevitable how will the amplifier behave We now come to the first possible reasons why tubes and semiconduc tors may sound different Presented with an over large signal tubes merely clip the peaks delivering a flat topped waveform while the over driving is taking place The limiting may occur at the grid as the circuit resistances are commonly such as to prevent it from being driven more than slightly positive or it may be the results of coalescence of characteristic curves at lower voltages The ear is surprisingly tolerant of such clipping when it occurs only on these occasional load bursts The semiconductors used in audio amplifiers are virtually always bipolar transistors either discrete or integrated They require base Tube Renaissance 10 2 current to be applied in order to make collector current flow Now transistor amplifiers normally incorporate a large amount of negative feedback and when such an amplifier limits some of its stages are driven very hard so that extra large base currents are drawn If any capacitors ar
13. n be different to input selector Br S Ecc CD Selection for recording from a Compact Disc A 09 AUX 1 Selection for recording from an Auxiliary Input such as 3 TV or Video AUX 2 Selection for recording from an Auxiliary Input such as TV or Video TAPE Selection for recording from a cassette tape see warning message TUNER Selection for recording from a radio broadcast DO NOT SELECT TAPE ON THE RECORD SELECTOR AND TAPE ON THE SOURCE SELECTOR AT THE SAME TIME WITH YOUR TAPE RECORDER CONNECTED THIS WILL CAUSE HOWL AROUND WHICH IS A VERY LOUD HIGH PITCH WHISTLING NOISE CAUSED BY CREATING A SIGNAL LOOP WITH YOUR TAPE RECORDER Operating your System 5 3 Operational Some users of tube amplifiers believe that because tube amplifiers take some time to warm up Notes that they should be left on all the time The Prophet preamplifier reaches peak performance levels 15 20 minutes after switch on Unless absolutely necessary it is not recommended that you leave your preamplifier permanently switched on this only wastes electricity and tube life but if necessary the Prophet premplifier is quite capable of being left switched on for very long periods of time DO NOT BE CONCERNED IF THE HT INDICATOR ON THE POWER SUPPLY REMAINS ILLUMINATED AFTER THE UNIT HAS BEEN SWITCHED OFF THIS IS QUITE NORMAL AND WILL REMAIN ILLUMINATED FOR A FEW SECONDS WHILE THE RESERVOIR CAPACITORS ARE SLOWLY DIS CHARGED Operating your System 5 4 Running
14. nimum distance of four inches above the preamplifier should be allowed as this is where most of the heat is generated Dedicated racks are available for housing your tube equipment contact your dealer or Tube Technology Do not locate the preamplifier close to radiators or any other heat source this could increase the operating temperature Do not directly block the ventilation grilles on the top cover of the preamplifier Do not locate the power supply too close to a turntable as the cartridge could pick up hum from the power transformer The power supply is exceptionally well screened and can be sighted directly under the preamp if you wish to sight it at a distance longer XLR power supply leads are available directly from Tube Technology DO NOT SIGHT THE PREAMPLIFIER OR POWER SUPPLY NEAR WATER OR HEAVY MOISTURE THE VENTILATION GRILLES ON THE TOP OF THE UNIT ARE AN EASY ACCESS POINT FOR MOISTURE TO ENTER uone rejsur c Installation 3 1 Audio Connection This chapter contains information on m Connecting the Prophet s Inputs amp Outputs m Connecting the Power Supply Outputs Rear Panel 0900 Left TUNER CD AUX1 AUX2 Right Prophet Preamplifier Prophet Power Supply Power Sunnlv m Diagram 1 Mains Connector Audio Connection 4 1 Connecting the Inputs amp Outputs PRE OUT REC OUT GROUND CD AUX 1 AUX 2 TAPE TUNER Your Preampli
15. o the inputs of your amplifier Preamplifier does not switch on 1 Ensure IEC plug on the mains lead is a snug fit into the IEC connector on the rear panel 2 Check the mains fuse located inside the fuse drawer at the base of the mains inlet see diagram 1 With volume at zero hum is present 1 Check that the the earthing arrangements are correct see chapter 2 Only one amplifier component should go to the mains earth When looking in the top window a tube seems to have gone milky white it does not light up when the unit is switched on 1 The vacuum of this tube has escaped through a small crack in the glass When inserting tubes into their sockets place a finger behind the socket ensuring the pcb does not flex and the tube fits into the socket with little stress Stress at the base of the tube around the pins can cause tiny fractures in the glass which develop in time Maintenance 7 3 Troubleshooting SYMPTOM REMEDY After switching on the power supply one of the indicators does not light 1 A fault has occured with this part of the power supply check the fuse relating to the indicator See Chapter 5 Front Panel 2 Change the fuse and try again if it fails again refer to a service engineer or Tube Technology After replacing a tube with the volume mid way I can hear my hand touching the preamplifier through the loudspeakers like an echo 1 The tube you have replaced is microphonic This is particula
16. out tube circuitry which may appeal to many audio engineers both professional and amateur A further point can be made in favour of tubes concerning cooling Output transistors have to be conduction cooled preferably by some method that does not heat up other semiconductors in the circuit This requires some rather bulky metalwork thermally isolated from the rest of the chassis Glass envelope tubes on the other hand looses most of their heat by a mixture of convection and radiation A brief reference may be in order here about what is usually considered to be main disadvantage of a tube amplifier the output transformer It is indeed a heavy and costly item to be set against the relative simplicity of circuit and various other advantages that have here been attributed to the tube equipment However it can enable the amplifier to work into more than one load impedance whilst a transformerless Tube Renaissance 10 4 semiconductor amplifier designed to drive an 8 ohm load would usually deliver only half its normal power into a 16 ohms and might be damaged if operated with 4 ohms Also with an output transformer provided that it is correctly loaded the amplifier input sensitivity without feedback is the same whatever the value of load impedance and by taking the negative feedback connection from a fixed point on the secondary winding the sensitivity with feedback can be made similarly independent of load impedance in other
17. perfect Now on the basis of measured performance many modern high fidelity semiconductor amplifiers are actually superior to the older tube amplifiers which were already good enough for their distortion tobe impercept able so how can here be subjective differ ences It seems that there cannot be any while the amplifiers are correctly operated and this may be the key to the mystery for there are two major problems one is that it is extremely difficult to avoid occasional over driving of an amplifer because of the very Tube Renaissance 10 1 large dynamic range of the audio signal and the other is that the loading is not always resistive It is under these usually uninten tional wrong conditions that differences may show up Let us consider the over driving first Owing to continual improvements in recording and playback technique the possible dynamic range of music signals from either disc or tape is greater now than it used to be Asa tentative estimate it appears that the loadest passage of a modern disc recording maybe 40dB above the average sound level Now it may be said that amplifiers in a high fidelity system ought theoretically to be able to reproduce the loudest of loud bursts without distortion However to allow for 40dB above 50mW not a very high listening level a power capability of 500W would be required and further developments may make the figure even greater One seems to hear a cry of w
18. r supply in the down position the unit is switched on and upwards to switch it off It is always wise to switch on your preamplifier first and then the power amplifier this always ensures a trouble free warm up See Diagram 2 After switching on the Prophet there is an electronic delay of 30 seconds before the unit actually switches on a small click from inside the unit can be heard when this happens This delay is a safety feature which ensures a muted warm up of the pre amp tubes These LEDS indicate that the power supply is functional The HT Indicator is illuminated red and the LT Indicator is illuminated amber This fuseholder houses the protection fuse for the High Tension supply B This fuseholder houses the protection fuse for the Low Tension Supply Heaters Selects the source of the input signal CD Selection for listening to a Compact Disc AUX 1 Selection for listening to an Auxiliary Input such as TV or Video AUX 2 Selection for listening to an Auxiliary Input such as TV or Video TAPE Selection for listening to a cassette tape TUNER Selection for listening to a radio broadcast Operating your System 5 2 Volume Control Record Selector Controls the sound output level for both left and right channels Counter clockwise rotation provides minimum output and clockwise rotation provides maximum output Selects the source of the input signal pu sig 9 Selects the output for your cassette recorder ca
19. ransistors From the late 1960 s tubes were largely though not entirely superceded by semiconduc tors in audio frequency amplifier designs This was an inevitable consequence of a continuing quest for new techniques Semiconductors Transistors and Integrated Circuits have cer tain and obvious advantages their small size absence of heaters low voltage operation and consequent opportunity to dispense with output transformers may appear to make tubes obso lete However from about 1975 onward there has been a resurgence of interest in tubes and it seems worthwhile to consider why It is said by hi fi enthusiasts that tube amplifiers sound better that their distortion is either lower or less noticable Carefully con ducted listening tests seem to bear this out although their results are difficult to interpret If there really are subjective differences to a listener between tubes and semiconductor am plifiers can they be explained technically One thing should be clearly understood it is possible to design either a tube or a semicon ductor amplifier so that over a certain range of output power its distortion will be so small as to be imperceptable to the ear Therefore if two similarly rated well designed high fidelity amplifiers one using tubes and the other using semiconductors are compared in the same listening conditions correctly oper ated their performance should be indistin guishable and subjectively
20. rly noticeable if the tube has been fitted in the phono stage 2 Change the tube for another After de selecting an input I can still hear 1 This is caused by breakthrough on the selector switch it cannot be avoided unless complicated sound degrading circuitry is employed The best advice is to switch of the offending signal this is particularly true for tuners which are often left on it in the background Maintenance 7 4 The voltage on the Prophet is switchable from 115V to 230V Changing Mains Voltage The unit operates with a voltage variation of plus or minus 10 per cent le satisfactory operation from 103 5 to 126 5 VAC or 207 to 253 VAC To change the voltage to another setting this is done by means of an external voltage selector accessible on the underside of the power supply It can be turned using a coin or large bladed screwdriver Maintenance 7 5 Specifications Figures given below are for a typical Prophet Signature Pre Preamplifier Dimensions Power Supply Dimensions Preamplifier Weight Power Supply Weight No of Inputs Input Sensitivity Input Impedance Overload Margin No of Outputs Class of Operation Type of Operation Rated Output Voltage Gain Ratio Output Impedance preamplifier Output Impedance record out Frequency Response Total Harmonic Distortion Signal to Noise Ratio Vacuum Tubes Power Consumption 350 x 250 x 75 mm W D H 350 x 250 x 75 mm W D H
21. s on your amplifier are unlacquered These metal parts will in time lack lustre due to oxidisation They can easily be restored to original condition by using a mild metal polish such as duraglit and a soft polishing cloth Do not clean the polished parts with water as this smears the surface and can leave water marks Anodised parts such as the front panel and top covers of the Prophet amp painted parts such as the bottom cover are best cleaned with a damp cloth then buffed with a dry cloth DO NOT apply any kind of polish For very stubborn marks a mild solvent such as methylated spirits can be applied ENSURE THAT THE UNITS HAVE BEEN DISCONNECTED FROM THE MAINS BEFORE COMMENCING ANY CLEANING OPERATIONS Maintenance 7 1 Diagram 3 WARNING ELECTRIC SHOCK HAZARD HIGH VOLTAGES EXIST WITHIN THE EQUIPMENT EVEN AFTER THE UNIT HAS BEEN DISCONNECTED FROM THE MAINS SUPPLY ENSURE THE POWER SUPPLY IS DISCONNECTED BEFORE REMOVING COVERS OF PREAMPLIFIER Maintenance 7 2 Troubleshooting SYMPTOM REMEDY Preamplifier switches on but there is no sound from the system 1 Check you have connected the power supply to the preamp Look in the top window of the preamp to see if the tubes are glowing this is an indicaton that the power supply is operating the preamp 2 Ensure you have connected the outputs of the preamp t
22. s to consequential loss damage or shipping charges These amplifiers only carry a ten year guarantee if used in conjunction with a Tube Technology power amplifier otherwise a TWO YEAR guarantee applies The manufacturers can accept no responsibility for defects arising from accident Guarantee 9 1 Tube Guarantee Registration Claims under this Guarantee misuse wear and tear neglect or through unauthorised adjustments and or repair neither can they accept responsibility for damage or loss occurring during transit to or from the person claiming under this guarantee This equipment has a SIX MONTH guarantee on the tubes allowing for any manufacturing defects to arise If a tube is found to be defective it should be returned to the dealer or failing this directly to Tube Technology packed in its original packaging Please complete the registration card and return it to Tube Technology Your guarantee is invalid without registration To transfer this guarantee to subsequent purchasers the new owner must notify Tube Technology of their name address and serial numbers of the equipment This equipment should be packaged in the original packaging and returned to the dealer from whom it was purchased or failing this any other authorised Tube Technology dealer If it is not possible to return the equipment by hand then it should be sent carriage prepaid by a reputable carrier Should the original packaging not be available repla
23. the power supply utilizes a female 3 pole XLR connector Plug the Male end of Supply the XLR interconnecting lead supplied into this connector and the other end into the XLR connector on the preamplifier labeled Power Supply IN in diagram 1 If you also are using a TT Phono stage it is possible to power this from the auxilary output If you wish to sight the power supply in a different location specific lengths of this interconnect can be ordered i DO NOT USE ANY OTHER CABLE TO CONNECT THE POWER SUPPLY TO THE PREAMPLIFIER AS IT MAY NOT CARRY THE CORRECT VOLTAGE RATING The IEC connector on the power supply connects to the mains supply via the mains cable supplied It also houses the mains fuse and spare fuse in the drawer at the base of the socket This is fuse is rated at 500mA Anti Surge or T DO NOT SWITCH ON THE SYSTEM UNTIL YOU HAVE READ CHAPTER 5 Operating Your System Audio Connection 4 3 Operating your System Front Panel This chapter contains information on Switching your preamplifier ON and OFF Playback amp Record Functions Operational Notes Record Volume Source Selector i Control Selector Off Switch Operation Indicators Diagram 2 gurjeJod Ulo s S C Operating your System 5 1 Switching On amp Off Operational Indicators 50 mA FuseHolder 1 0A Fuseholder Source Selector By switching the toggle switch on the powe
Download Pdf Manuals
Related Search