Related Manuals for Conrad-johnson design PREMIIER TWO
Summary of Contents for Conrad-johnson design PREMIIER TWO
- Page 1 OWNER'S MANUAL PREMIER TWO VACUUM TUBE PREAMPLIFIER conrad-johnson design, inc. 703-698-8581...
- Page 2 Thank you for your considered purchase of a conrad-johnson Premier Two Preamplifier. In it, you have acquired one of the finest pieces of music reproduction equipment available today. The Premier Two preamplifier 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 preamplifier.
- 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 Premier Two phono stage consists of two stages of cascode triode pairs. This provides sufficient open loop gain to achieve optimum feedback ratios even at bass frequencies. The second stage is direct coupled to a cathode follower which drives the feedback loop as well as the output. -
Page 6: Installation
INSTALLATION Because of the number and type of vacuum tubes used, the Premier Two dissipates a significant amount of heat (approximately 50 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 un-obstructed. - 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 100 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.
- Page 8 USE OF EXTERNAL TONE CONTROLS OR OTHER EXTERNAL SIGNAL PROCESSING DEVICES: Use Tape 1 and Record 1 for your tape recorder, as described in the preceding two paragraphs. Connect the output of the tone controls to Tape 2 and the input of the tone controls to Record 2.
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Page 9: 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 90 seconds after the unit is turned on in order to suppress warm up transient noises. - Page 10 full clockwise position will reproduce only the right channel. In normal use this control will be centered. Volume: The Premier Two volume control is an extremely precise control, maintaining channel to channel tracking within t 1/2 db throughout its rotation. Mute: This switch permits the user to manually trigger the relay grounding the preamps' main outputs after the initial warm up period.
- Page 11 We anticipate two to three years of operation without degradation in normal use. We highly recommend that, when the time comes to replace the vacuum tubes, you purchase replacement tube sets from conrad-johnson design. Please note: The indiscriminate substitution of type 12AX7 tubes for the 5751s will seriously degrade sonic performance of the unit.
- Page 12 Tube locations: Tube complement: V1,V2 12AX7 V3,V4,V6,V7,V8 5751 V5,V9 5965 12X4 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 13: Specifications
SPECIFICATIONS: Gain: phono stage 40 db high level 27 db Output: maximum 25v, rated at 2.5v Phase: phono and high level stages are each phase correct (non-inverting) Phono overload: in excess of 500mv at 1kHz Response: bandpass 2Hz to more than 100kHz RIAA equalization to t .25db (20-20kHz) Total hum and noise (20-20kHz): Phono inputs: 72db below 10mv input... - Page 14 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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