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Summary of Contents for Conrad-johnson design PV4
- Page 1 OWNER'S MANUAL VACUUM TUBE PREAMPLIFIER conrad-johnson design, inc. 703-698-8581...
- Page 2 We believe that it will be one of the most satisfying purchases of audio equipment that you will make. The PV4 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 1. conrad-johnson design, inc. warrants to the original purchaser that the conrad- johnson PV4 will perform to specifications as published in the owner's manual and that it will be free of defects in materials and workmanship for a period of three years from the date of original purchase.
- 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 PV4 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. -
Page 6: Installation
To minimize hum pickup, keep the unit well away from the power amplifier, and route power cords away from input cables. THE PV4 IS TO BE OPERATED ONLY ON AC LINE VOLTAGE OF 108 to 125 VOLTS, 50 or 60 HZ. -
Page 7: Power On/Power Off Procedures
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 100 pico-farads capacitance. This is the industry standard load and will work well with most moving magnet cartridges and all pre-preamplifiers for moving coil cartridges. - Page 8 Similarly, the full clockwise position will reproduce only the right channel. In normal use this control will be centered. Volume: The PV4 volume control is an extremely precise control, maintaining channel to channel tracking within t 1/2 db throughout its rotation.
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Page 9: Absolute Phase
Each component in your system is either phase correct (non-inverting) or phase inverting. If you know the phase of each component in your system (your PV4 is phase inverting) then correct absolute phase is obtained by the following simple rule: THE TOTAL NUMBER OF PHASE INVERSIONS IN THE SIGNAL PATH SHOULD BE EVEN. -
Page 10: Vacuum Tubes
VACUUM TUBES The audio circuit of the PV4 uses five vacuum tubes of two different types: three 12AX7 (V1, V2 and V4) and two 12AT7 (V3 and V5). Each type has been carefully chosen for its circuit application. It is well known that tubes of a given type vary sonically depending on the manufacturer. - Page 11 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.
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Page 12: Specifications
SPECIFICATIONS Gain: phono stage 38 db high level 18 db Outputs maximum 25v rated at 2.5v Phase: phono is non-inverting; high level stage is phase inverting Phono overload: in excess of 500mv at 1kHz Response: bandpass 2Hz to more than 1OOkHz RIAA equalization to +/- .25db (20-20kHz) Total hum and noise (20-2kHz): Phono inputs, 70db below 10mv input... - Page 13 If the problem is intermittent, please indicate. If you do not have the original packing material, replacements are available from conrad-johnson design at a nominal charge. If the unit is under warranty, enclose a copy of your receipt as proof...
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