Related Manuals for Conrad-Johnson Premier Four
Summary of Contents for Conrad-Johnson Premier Four
- Page 1 OWNER'S MANUAL PREMIER FOUR VACUUM TUBE POWER AMPLIFIER conrad-johnson design, inc. 703-698-8581...
- Page 2 In it, you have acquired one of the finest pieces of music reproduction equipment available today. The Premier Four amplifier was designed for the purpose of providing ourselves (and other members of the community of designers of high fidelity audio equipment) with a reference quality amplifier.
- Page 3 LIMITED WARRANTY FOR THE conrad-johnson PREMIER FOUR 1. conrad-johnson design, inc. warrants to the original purchaser that the conrad- johnson Premier Four 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.
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Page 4: Circuit Design
A substantial main power supply of nearly 2,000 microfarads at more than 500 volts enables the Premier Four to easily meet these extraordinary current demands. The supplies for the two channels are separated after the input condenser to reduce cross coupling of the stereo channels to negligible levels. -
Page 5: Installation
The front panel of the Premier Four will fit in a standard 19" equipment rack and is designed to carry the weight of the unit so that it may be rack mounted. Again, it is important that adequate clearance be provided above the Premier Four so that ventilation is not impeded. - Page 6 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 Premier Four is phase correct) then correct absolute phase is obtained by the following simple rule:...
- Page 7 THE TOTAL NUMBER OF PHASE INVERSIONS IN THE SIGNAL PATH SHOULD BE EVEN. If the number of phase inverting components is either none, or even, then simply wire the speakers in a phase correct manner (amplifier C to speaker "-", amplifier 4, 8, or 16 to speaker "+".) If the number of phase inverting components is odd, then one more inversion should be added.
- Page 8 Tube locations: Tube complement: V1, V2 5751 V3, V4 6FQ7/6CG7 V5 - V12 EL34...
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Page 9: Tube Replacements
TUBE REPLACEMENTS The Premier Four uses twelve vacuum tubes of three different types: two 5751 (V1 and V2), two 6FQ7 (V3 and V4) and eight EL34s (V5 through V12). 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 10 ADJUSTING OUTPUT TUBE BIAS Biasing the amplifier is a simple procedure that can readily be done by the owner. Only a screwdriver is required. After replacing the tubes, the amplifier should be connected to a load (your loudspeakers will work fine) and there should be no signal applied to the amp.
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Page 11: Specifications
SPECIFICATIONS Power: 100 watts per channel, minimum RMS at 4, 8, or 16 ohms from 30Hz to 15kHz, with no more than 1% total harmonic distortion or intermodulation distortion. Sensitivity: 875mv to full power Small Signal Distortion: less than .05% at midband Phase: Phase correct (non-inverting) Frequency Response: 20Hz to 20kHz +0, -.5 db Hum and Noise: -96 db below full power output... - Page 12 SERVICE In the event your Premier Four amplifier requires service, remove and individually box all tubes and pack in the tube cartons. Enclose the tube cartons with the amp, repack in the original shipping crate and ship freight prepaid to: conrad-johnson design, inc.
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