Related Manuals for Conrad-johnson design PV 7
Summary of Contents for Conrad-johnson design PV 7
- Page 1 OWNER'S MANUAL PV 7 VACUUM TUBE PREAMPLIFIER conrod-johnson design, inc. 703-698-8581...
- Page 2 Thank you for purchasing the conrad-johnson model PV7 vacuum tube preamplifier. We believe that it will be one of the most satisfying purchases of audio equipment that you will make. The PV7 was designed to provide audiophiles with a moderately priced preamplifier of high quality which would accurately reproduce the dynamics, tonalities and textures of a live musical performance.
- Page 3 4. Where permitted by law, conrad-johnson design's liability shall be limited to that set forth in this warranty. No other warranty of any kind, expressed or implied, is made by conrad-johnson design, inc., and all implied warranties, including...
- Page 4 Factory service will be offered at reasonable rates. • Transferable warranty - conrad-johnson design guarantees its products, not the owner. Should you decide to sell the product, the warranty may be transferred to the new owner. (See Registering the Warranty).
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Page 5: Circuit Design
CIRCUIT DESIGN The phono stage of the PV7 consists of two cascaded triode amplifiers direct coupled to a cathode follower for low output impedance. Phono equalization is accomplished by R-C networks in a direct coupled feedback loop driven by the cathode follower. The RIAA components are 1% tolerance, with RIAA capacitors being polystyrene dielectric. -
Page 6: Installation
INSTALLATION Because of the number and type of vacuum tubes used, the PV7 dissipates a significant amount of heat (approximately 30 watts). It is essential therefore, that proper attention be paid to ventilation. The unit should be mounted horizontally on a flat hard surface so that the ventilation holes in the bottom are unobstructed. - Page 7 CONNECTION Inputs: Phono - The phono inputs provide the additional amplification and RIAA equalization required by most high fidelity cartridges. The input impedance is 47,000 ohms shunted by approximately 140 picofarads capacitance. This is the industry standard load and will work well with most moving magnet cartridges and all pre- preamplifiers for moving coil cartridges.
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Page 8: Operation
OPERATION Turn on: Because of the delayed warm up characteristics of vacuum tube equipment, a time delay muting circuit is incorporated in this preamplifier. Output 1 and Output 2 are grounded via a relay for approximately 45 seconds after the unit is turned on in order to suppress warm up transient noises. -
Page 9: Vacuum Tubes
We highly recommend that, when the time comes to replace the vacuum tubes, you purchase replacement tube sets from conrad-johnson design. Please note: Substitution of 12AX7 type for the type 12AT7 is likely to damage the 12AX7. -
Page 10: Tube Locations
TUBE LOCATIONS: Tube complement: V1,V2,V4: 12AX7 V3,V5: 12AT7 Fuse: The AC line is fused to protect the transformer. This fuse will not fail in normal operation. Failure of the fuse is a symptom of a more serious problem, so the unit should be taken to a qualified Service Center. -
Page 11: Specifications
SPECIFICATIONS Gain: phono stage 40 db high level 20 db Output: maximum 25v (rated at 2.5v) Phase: phono is non-invertin g so tape outputs are phase correct high level stage inverts phase of all inputs including phono Phono overload: in excess of 500mv at 1KHz Response: bandpass 2Hz to more than 100 KHz RIAA equalization to +/- .25db (20-20KHz) Total hum and noise (20-20KHz):... - Page 12 In the event your conrad-johnson component requires service, repack it with the original packing material and ship it to: Service Department conrad-johnson design, inc. 2733 Merrilee Drive Fairfax, VA 22031 For components weighing 90 lbs. or less, we recommend that you ship via United Parcel Service (UPS).
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