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Conrad-johnson design MV125, Owner'S Manual

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Congratulations

 on your purchase of the conrad-johnson MV125 ampli-

fier. You have acquired one of the finest pieces of music reproduction
equipment available today. You will find it to be capable of reproducing
with remarkable accuracy the dynamics, tonalities, and textures of live
music performances. The design and materials have been carefully
selected to yield years of unvarying excellence.

Please take a few minutes to read this manual so that you will better
understand the featues and capabilities of your MV125.

MV125 Owner’s Manual

1

Summary of Contents for MV125

Page 1: ...ill find it to be capable of reproducing with remarkable accuracy the dynamics tonalities and textures of live music performances The design and materials have been carefully selected to yield years of unvarying excellence Please take a few minutes to read this manual so that you will better understand the featues and capabilities of your MV125 MV125 Owner s Manual 1 ...

Page 2: ...ht and insurance prepaid by conrad johnson design Replacement cartons are available from the factory for a nominal charge d Normal wear and maintenance are not covered by this warranty 3 The above warranty may be transferred to subsequent owners pro vided that the warranty registration card has been returned to conrad johnson design inc within 30 days of the original purchase and that the register...

Page 3: ...on design inc 2800 R Dorr Avenue Fairfax VA 22031 REGISTERING THE WARRANTY Please return the enclosed card to the factory within 30 days of pur chase to register the warranty Proper registration of the warranty is important It will enable us to inform you of any alterations in the design of a given model and of any new products we offer which are likely to be of interest to you MV125 Owner s Manua...

Page 4: ...es to provide balanced low impedance drive to the push pull output stage The output stage features ultralinear operation of two pairs of 6550s for high power levels with reduced source impedance As a result the amplifier is capable of supplying the large current demands of high amplitude musical transients driven into reactive speaker loads A substantial main power supply of massive polypropylene ...

Page 5: ... not impeded About eight inches of the front of the rack should be left open above the unit To minimize hum pickup keep the unit well away from the preamplifier and turntable and route power cords away from input cables THE MV125 IS TO BE OPERATED ONLY ON AC LINE VOLTAGE OF 108 TO 125 VOLTS The MV125 is optionally available wired for 100 volt 120V 220V or 240 volt 50 60 Hz current CONNECTION INPUT...

Page 6: ...lly be achieved by taking care to connect the wire from the 4 8 or 16 ohm amplifier terminal marked on each channel to the red or coded terminal on each speaker and connecting the C tap to the black or coded terminal on each speaker In phase connection of the speakers can be readily ascertained by ear With the preamplifier mode switched into the MONO position play a recording of a solo vocalist Wi...

Page 7: ...spond to musical transients by first moving out they are creating a rise in pressure and the system is said to be phase correct If they respond by moving in they create a fall in pressure and the system is said to be phase inverting Each component in the stereo system is either phase correct or phase inverting including the cartridge and speakers these are normally phase correct Your MV125 is phas...

Page 8: ...al reality Others will strangle the sytem to the point where it becomes no better than average To complicate matters our experience suggests that the choice of interconnects will be system dependent those that are ranked first on a given system may be a poor choice for a different system Consult your conrad johnson dealer for recommendations for your specific system QUESTIONS If you have any quest...

Page 9: ...t tubes are individually biased replace ment tubes need not be matched pairs No a c balance adjustment is necessary It is necessary to re bias the amplifier when the output tubes are replaced The MV125 has built in bias indicators so that no instru ments are required to make this adjustment ADJUSTING OUTPUT TUBE BIAS Biasing the amplifier is a simple procedure that can easily be done by the owner ...

Page 10: ...se holder will light when the fuse is blown What happens when the fuse blows If one of these fuses should blow it usually indicates a marginal 6550 tube one of four for each channel and an attempt should be made to identify and replace it by either a replacing the fuse and turning on the amp while watching the 6550s carefully look for a bright white or blue flash inside the tube If nothing happens...

Page 11: ...tortion or intermodulation distortion Sensitivity 880 mv to full power Small Siganal Distortion Less than 1 at midband Phase Phase correct non inverting Frequency response 20Hz to 20KHz 0 5dB Hum and noise 96dB below full power output Input impedance 100K ohms Dimensions 20 5D x 19W x 8 75H inches Weight 80 lbs MV125 Owner s Manual 11 ...

Page 12: ...e Fairfax VA 22031 Be sure to enclose a note explaining the problem you are having in as much detail as possible If the problem is intermittent please indicate If you do not have the original packing material replacements are avail able from conrad johnson design at a nominal charge If the unit is under warranty be sure to enclose a copy of your receipt as proof of purchase MV125 Owner s Manual 12...

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