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Nagra – 

VPA 

 

 

Congratulations 

 
Congratulations, you have just purchased one of the best amplifiers ever made!  
 
The VPA were created by an engineering team with more than 60 years of 
experience designing world-class products for the professional audio, national 
security and military businesses.  
 
Since its inception in 1951, Nagra builds products that continue to earn a 
reputation for delivering ultimate sonic performance. Numerous awards have 
been bestowed upon Nagra for its technical innovation, excellence in design and 
flawless construction including three Oscars

®

 and one Emmy

®

 
The hi-fi products and field recorders are developed by the same R&D 
Department. Nagra philosophy is to provide innovation and technology in order to 
design high quality products. The hi-fi range was created to implement innovative 
designs and provide Nagra expertise to a new field.  
 
Thank you for being our customer and enjoy your new VPA amplifiers

Package content 

 
In addition to the user manual:   

 
 

 

2x VPA monoblocks; 

 

 

2 mains cables *; 

 

 

Set of spare fuses; 

 

 

Hex screwdriver (to install the tube protections); 

 

 

2x Sets of tube protections; 
 

 

2x Sets of feet; 
 

 

2x Sets of 845 tubes; 

 

 

Microfiber gloves (from Swiss Haute Horlogerie); 

 

 

Measurement protocol, this is the actual electrical measurement of 
your amplifiers. 

 
If anything is missing, please contact your dealer. 
 
*depending on your country, the AC mains cable features either bare wired, US, 
European or Swiss plug. 

Summary of Contents for VPA

Page 1: ...P N 2055008151 A Al ll l r ri ig gh ht ts s r re es se er rv ve ed d 2 20 01 14 4 r re ev v1 1 VPA Ultimate 845 amplifiers Instruction manual ...

Page 2: ... tubes 6 Installation of the tube protections 7 VPA connections 8 Connecting the VPA to the source 8 Connecting the loudspeakers 8 Connecting the AC mains power 9 Operation 10 The main selector 10 Selecting the correct speaker impedance 11 Tube ageing and replacement 12 Tube compatibility 12 Tube bias adjustment 12 Technical specifications 13 Declaration of conformity 14 ...

Page 3: ...riod of three years from the date of delivery to the user Warranty will be void if the serial number has been removed from the unit This limited warranty covers the repair of confirmed defects or if necessary the replacement of the faulty parts excluding all other indemnities All freight costs as well as customs duty and other possible charges are at the customer s expense We decline any responsib...

Page 4: ...corders are developed by the same R D Department Nagra philosophy is to provide innovation and technology in order to design high quality products The hi fi range was created to implement innovative designs and provide Nagra expertise to a new field Thank you for being our customer and enjoy your new VPA amplifiers Package content In addition to the user manual 2x VPA monoblocks 2 mains cables Set...

Page 5: ...e feet The VPA needs to stand on its feet to be stable please install them Turn each of the two VPA mono blocks on their side on the edge of a table Step 1 Start by removing the transportation screws Step 2 Install the feet using the longer screws provided ...

Page 6: ...made for Nagra using state of the art Haute Horlogerie micro fiber fabric Each VPA has its own set of tubes with a serial number written on the socket Each tube is also marked FRONT or REAR which indicates the correct location for the tube on the particular amplifier This dent must face the rear of the unit Step 1 Insert the tube make sure the dent is in the correct position Step 2 Rotate the tube...

Page 7: ...ould be careful not to get too close to the tubes and especially to keep children away from the amplifier You should also make sure to keep any object or fabric like curtains for instance away from the amplifiers to avoid any fire risk Gently slide the tube protection down Make sure the screw holes are placed above those of the VPA Using the hex screwdriver provided put the screws back in place ...

Page 8: ...mplifier to the XLR balanced input or the RCA connector Input panel Speaker terminals Ground connector ask your dealer how to use it Voltage selector Mains switch and IEC connector The white jumper allows you to select either XLR balance input as shown on the picture or RCA unbalanced ...

Page 9: ...mance out of your speakers Connecting the AC mains power Before connecting the AC power cables verify that the AC mains voltage selector located on the rear panel is in the correct position corresponding to the supply voltage available in your country Here the selector is on 220 V If the selector is not in the right position make sure to change it and check the fuse value 110 120V operation two 10...

Page 10: ...onal The best performance will be obtained after 15 minutes operation warming up time Mains switch rear Main selector position What is happening O Any The unit is completely off I OFF The unit is in standby I MUTE The unit is On sound is muted I ON On To prevent tube ageing it is better leave the amplifier on for longer periods rather than turning it on and off several times a day For more informa...

Page 11: ...ers the red pointer indicates the peak cathode current and the black pointer indicates the peak anode voltage of the output tube They will allow you to know if the impedance match is right When playing music main selector in the ON position Needle position What is happening Solution Red needle Green needle Output impedance is too high Choose a lower output 8 or 4 Ohms Green needle Red needle Outpu...

Page 12: ...ce in a while From time to time before listening check the bias and eventually adjust it to make sure you get 100 performance out of your amplifiers Tube compatibility Nagra selected 845 tubes go through a rigorous selection 24 hour burn in individual measurement and selection and are paired using a Nagra unique process Using 845 from other suppliers will void warranty Tube bias adjustment Please ...

Page 13: ...put power 50 W rms Input impedance 100 k Ohms Inputs 1 RCA 1 XLR balanced Selection by jumper Frequency response 20 40 kHz 0 3dB Signal to noise ratio 100 dB ASA A Output impedance 4 8 16 Ohms Bare wires up to 4 2 mm 4mm banana plugs 6 35mm spade lugs Driver tubes 2x ECC83 1 E182CC Voltage range 108 121 V or 216 242 V Japan 100 V 50 60 Hz Power consumption 250 W continuous Dimensions 335 x 115 x 3...

Page 14: ...ng norms NORMES GENERIQUES APPLICABLES APPLICABLE GENERIC NORMS CENELEC EN 61000 3 2 61000 3 3 50081 1 50082 1 Avertissement Bien qu étant conforme aux normes cet appareil peut dans des cas exceptionnels provoquer des interférences Dans ce cas il peut être demandé à l utilisateur de prendre des mesures appropriées Warning Although this equipment conforms to the stated norms under certain exception...

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