Nagra CLASSIC PHONO, User Manual

Page 1: ...P N 2055034159 All rights reserved 2020 rev1 CLASSIC PHONO User manual ...

Page 2: ...Operations 9 Basic operations 9 Nagra Modulometer 9 Light intensity adjustment 10 Curve selection 10 Mono cartridge LED 10 Mono stereo mode selection 11 Gain selection 11 Input setting 12 Open close the Nagra CLASSIC PHONO 12 Factory settings 13 Jumpers switch functions 14 Load circuits 15 Load circuit installation 15 External transformer usage 16 Maintenance 17 Tube ageing 17 Case cleaning 17 Tec...

Page 3: ...y Audio Technology Switzerland SA certifies that this device has been inspected and tested before leaving the factory Every Nagra unit goes through our test laboratory The result of the measurements is recorded in the Protocol documentation that comes with your device We guarantee our products against all manufacturing defects for a period of three years for the Nagra CLASSIC PHONO and six months ...

Page 4: ...agra has launched a Hi Fi range to allow the wider public to benefit from technical advances that are often the privilege of the professionals This technology exists in the service of music your music This is why we already wish you some great moments of listening pleasure with your Nagra CLASSIC PHONO Thank you for your trust Package contents Besides the manual and the Nagra CLASSIC PHONO itself ...

Page 5: ...l around the chassis for adequate ventilation Ventilation should not be impeded by covering the ventilation openings with items such as newspapers table cloths curtains etc The Nagra CLASSIC PHONO must rest on a stable support We recommend that you use the anti vibration support the Nagra CLASSIC VFS FOR SOURCE Vibration Free Support for source developed by Nagra consisting of isolated solid alumi...

Page 6: ...des a replacement fuse The fuse type is FST 5x20mm 250V T 500mA L Should you need to replace it only use the same fuse type Connecting the Nagra CLASSIC PSU Start by removing the IEC power cable from the IEC Appliance inlet of the Nagra CLASSIC PHONO The Mains switch position is no longer relevant when an external power supply is connected Place the front panel selector in the OFF position Insert ...

Page 7: ... optimal performance from the Nagra CLASSIC PHONO it is preferable to leave the device switched on for about 15 minutes before use so that the internal components can reach their optimum operating temperature Like all tube electronic devices the Nagra CLASSIC PHONO needs a running in period It will reach peak performance after a few hundred hours operation Note about the Ground connectors This fea...

Page 8: ...n selection Low position MM 38 dB MC 54 dB High position 10 dB MM 48 dB MC 64 dB 7 Front rotary selector When turned ON the CLASSIC PHONO will go through a 2 minutes preheating phase with the Mono cartridge LED blinking This is in order to optimize the warming up of tubes and critical components This will allow your CLASSIC PHONO to offer excellent performance for a longer period the components ma...

Page 9: ...he unit is on and muted warming up for instance I ON PHONO 1 The unit is fully operational on the input PHONO 1 I ON PHONO 2 The unit is fully operational on the input PHONO 2 Nagra Modulometer Nagra Modulometer is inherited from the second recorder developed by Nagra back in 1952 the Nagra II The Modulometer is a typical Nagra precision instrument that displays the necessary information to perfor...

Page 10: ...y all the way to complete extinction In total there are 7 different levels Curve selection This 3 positions switch allows you to select the desired de emphasis curve Mono cartridge LED This LED switches ON when the switch 7 on the cartridge setting board of the selected input is set on position A Note Only use this setting with a monoral cartridge installed on the turntable The LED is blinking dur...

Page 11: ...mode selection This 2 positions switch allows you to select the desired type of output Gain selection This 2 positions switch allows you to select the desired gain on the output High 10 dB MM 47 7 dB MC 63 9 dB Low MM 37 7 dB MC 53 9 dB ...

Page 12: ...d disconnect its power cable Mains or external DC power supply at least 10 minutes before opening the top panel to perform any changes or adjustments on the input modules Open close the Nagra CLASSIC PHONO Remove the eight screws from the top panel of the Nagra CLASSIC PHONO with the supplied Allen key 2 5 mm Then vertically lift up the top panel to open the device When closing the device make sur...

Page 13: ...13 Nagra CLASSIC PHONO Factory settings The factory settings are indicated on the figure below MM factory settings 1B 2B 4A 5B 6B 7B MC factory settings 1B 2B 3A 5A 6B 7B M C M M PHONO 2 PHONO 1 ...

Page 14: ... both recesses on the circuit sides to lift it up vertically there is no screw or anything else to secure the circuit in order to have good access and a good view of the serigraphy Optional R C load location Left channel jumper block 1 6 Jumpers 1 6 switch 7 explanations Right channel jumper block 1 6 Mono Stereo switch 7 Cartridge setting board 1 B A Asymmetrical input Symmetrical input 2 B A Wit...

Page 15: ... matches precise load values 1 6 standard loads 1 100Ω 2 180Ω 3 270Ω 4 470Ω 5 1kΩ 6 100pF 7 9 optional tailored loads 7 your wish 8 your wish 9 your wish You can choose the load circuit to be installed according to the technical characteristics of your cartridge Please refer to the relevant manufacturer s data While waiting for the custom circuits you can use the closest load value to that specifi...

Page 16: ...this case you must set the jumpers to disconnect the internal transformer on a MC module Here is the required setting for a MC module 1 B 3 B or not installed 4 A 5 B 2 6 7 are up to you On a MM module you can connect the transformer directly to the input connectors The jumpers must be in the factory setting positions ...

Page 17: ...ours we suggest that you identify the signs of ageing The distortion gently increases to an audible level Presence of clicks dry and short noise like breaking dead wood Presence of pops short noise in the low frequencies Presence of hiss higher background noise As soon as one of these signs appears please contact your Nagra dealer to order a Nagra CLASSIC PHONO replacement tube kit reference 70550...

Page 18: ...d to the inputs Total harmonic distortion THD N Please refer to the graph on next page Crosstalk 75 dB typically 82 dB Interchannel phase 4 typically 0 35 20 kHz Output level 1 VRMS for 0 dB Large tolerance to give easily 2 VRMS Output impedance 500 Ω typically 470 Ω Vacuum tubes 2x E88CC 6922 1x ECC81 B739 1x ECC83 B759 Selected by Nagra Laboratory Power supply 1x 12 6 V 1 5 A or 100 240 V 10 50 ...

Page 19: ...F to 95 F Moderate climate Operating environment Indoor only IP30 Dimensions 310 x 254 x 76 mm 12 2 x 10 x 3 inches Weight 5 4 kg 11 9 lbs CLASSIC PHONO unit alone with 1x MM input and 1x MC input FFT of THD N A weighting Specifications may change without notice ...

Page 20: ...20 Nagra CLASSIC PHONO De emphasis curves Note Below 1kHz the RIAA curve is almost overlaid by the TELDEC curve ...

Page 21: ...21 Nagra CLASSIC PHONO Declaration of conformity ...

Page 22: ... electrical and electronic equipment By ensuring this product is disposed of correctly you will help prevent potential negative consequences for the environment and human health The recycling of materials will help to conserve natural resources For more detailed information about recycling of this product please contact your local authority your household waste disposal service or the shop where y...