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Nagra – 

VPA 

 

 

Security warnings 

 

 

Carefully read this manual before installing your new VPA; 

 

Should you have any questions on how to set-up or use your 
amplifiers, contact your Nagra dealer; 

 

AUDIO TECHNOLOGY SWITZERLAND SA declines all responsibility in 
the event of an accident caused by the non-observance of these 
instructions or any other form of user negligence; 

 

Do not attempt to open the unit under any circumstances. Refer any 
service/repair work to qualified personnel. There are no user 
serviceable parts inside the amplifier; 

 

The Nagra VPA is designed to be used indoor only; 

 

The Nagra VPA runs very hot, install it in a safe place to avoid any risk 
of injury, especially with children and domestic pets; 

 

Should you need to ship or transport your amplifier, always use the 
original packing supplied by Nagra. 

 

Warranty 

 

AUDIO TECHNOLOGY SWITZERLAND SA, certifies that this instrument was 
thoroughly inspected and tested prior to leaving its factory and is in accordance 
with the data given in the accompanying measurement protocol and test sheet.  

 
We warrant the products of our own manufacture against any defect arising from 
faulty manufacture for a period 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 responsibility for any and all damages resulting, directly or 
indirectly, from the use of our products.  

 
We reserve the right to modify the product, and / or the specifications without 
notice.  

 
 
 

 

 

Disposal of Old Electrical & Electronic Equipment (Applicable in the 
European Union and other European countries with separate collection 
systems). 
This symbol on the product or on its packaging indicates that this 
product shall not be treated as household waste. Instead it shall be 
handed over to the applicable collection point for the recycling of 
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 
you purchased the product. 

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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