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Summary of Contents for Conrad-Johnson PV8
- Page 1 OWNER’S MANUAL VACUUM TUBE PREAMPLIFIER conrad-johnson design, inc. 703-698-8581...
- Page 2 Congratulations on your purchase of the conrad-johnson model PV8 vacuum tube preamplifier. In it, you have acquired one of the finest pieces of musical reproduction equipment available today. It is the result of a decade of research by conrad-johnson design into the application of vacuum tube devices to the reproduction of recorded music.
- Page 3 2. conrad-johnson will repair defective units without charge for labor or parts (with the exception of the vacuum tubes) subject to the following conditions: a) The unit must not have been altered or damaged through misuse, abuse, negligence, accident, or improper operation.
- Page 4 Proper registration of the warranty is important! Not only will it preserve transferability of your warranty, it will also 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. PV8 Owner’s Manual...
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Page 5: Installation
The PV8 requires an ac power line providing between 108 and 125 volts at 50 to 60 Hz. Alternatively, the PV8 can be reconnected internally for operation on 220 volt power lines. Consult your dealer for details about the conversion. - Page 6 We recommend the use of an amplifier with an input impedance of 10k ohms or higher. Since the PV8 inverts phase, it may be necessary to invert the speaker leads to maintain correct phase. See the section on "Getting the most out of your PV8" for an explanation of this.
- Page 7 THE TOTAL CURRENT REQUIRED OF THE SWITCHED OUTLETS MUST NOT EXCEED 5 AMPERES. This precludes the use of these outlets for high powered amplifiers. It is preferable not to switch power amplifiers by the preamplifier power switch in any case. PV8 Owner’s Manual...
- Page 8 1.5 dB steps. The maximum attenuation is about 7.5 dB, so both channels will be present even in the extreme positions. In normal use the control will be centered. LEVEL: The PV8 volume control is an extremely precise control, maintaining channel to channel accuracy to within 1/2 dB throughout its rotation.
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Page 9: Vacuum Tube Replacement
VACUUM TUBE REPLACEMENT The audio circuit of the PV8 uses six vacuum tubes of three different types: two 12AX7 (V1 and V2), two 5751 (V3 and V5) and two 5965 (V4 and V6). Each type has been carefully chosen for its circuit application. -
Page 10: Tube Locations
220V: 1/2 amp 3AG slo-blo GETTING THE MOST FROM YOUR PV8 The conrad-johnson PV8 offers an unparalleled level of sophistication and refinement in music repro- duction, but it cannot transform an inferior stereo system. Only high quality amplifiers and loudspeaker systems will be capable of fully revealing the capabilities of this precision instrument. - Page 11 THE PV8 IS PHASE INVERTING. If your system has an odd number of inversions, then you must add one phase inversion. This will be the case if the PV8 is the only unit in the chain that inverts phase. THIS IS CONVENIENTLY DONE BY REVERSING THE POSITIVE AND NEGATIVE CONNECTIONS TO YOUR SPEAKERS (be sure to reverse both channels).
- Page 12 Hum and noise(20Hz-20KHz): phono inputs:74dB below 10mv input Line level:84dB below 2.5V output Distortion: THD less than .25% IM less than .25% Ouput impedance: less than 200 ohms Dimensions: 19"W x 3.5"H x 12.5"D Weight: 12 lbs. PV8 Owner’s Manual...
- Page 13 SERVICE In the event your conrad-johnson PV8 stereo preamplifier requires service,repack it with the original packing material and ship via United Parcel Service (UPS) to: Service Department conrad-johnson design, inc. 2733 Merrilee Drive Fairfax, VA 22031 Be sure to include a copy of your sales receipt from the original purchase, along with a note explaining the problem you are having in as much detail as possible.
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