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Thank you for selecting the CAV50 as the control amplifier for your audio
system. The first control amplifier (integrated amplifier) from conrad-
johnson, the CAV50 benefits from more than two decades of building
among the finest audio amplifiers and preamplifiers in the world. It
demonstrates the same remarkable ability to recreate the dynamics,
textures, tonalities, and ambience of live musical performances for
which conrad-johnson products are known. With the CAV50, we believe
that you will experience the excitement of discovery in hearing more
from your favorite recordings than ever before.
At conrad-johnson, we expect our products to be a source of satisfaction
and pride to their owners for many years to come. Accordingly, circuit
designs, parts and materials for all conrad-johnson products are se-
lected with a view to maintaining optimal performance over the years.
Our reputation for producing among the industry's most reliable compo-
nents is a natural consequence of this engineering approach.
Although operation of the CAV50 is quite straightforward, please take a
few minutes to read this manual for useful information on it's installation
and operation.
In closing, we'd like to welcome you to the family of conrad-johnson
owners. We want you to enjoy your conrad-johnson product to the
fullest. To this end, our staff stands ready to answer any questions you
may have about the function and application of your CAV50, and to
provide any needed service both during, and after the warranty period.
Our goal is to heighten your enjoyment of recorded music.
CAV50 Owner's Manual
1
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Summary of Contents for Conrad-Johnson CAV50
- Page 1 Thank you for selecting the CAV50 as the control amplifier for your audio system. The first control amplifier (integrated amplifier) from conrad- johnson, the CAV50 benefits from more than two decades of building among the finest audio amplifiers and preamplifiers in the world. It...
- Page 2 Units which have been modified, altered, or improperly repaired by anyone not specifically authorized by conrad-johnson design, inc. c) Units not purchased from an authorized conrad-johnson dealer in the United States for use in the United States. d) Normal wear.
- Page 3 The Service Department can also be reached by phone at 703-698- 8581, or by fax at 703-560-5360 Service If your conrad-johnson audio component requires service, repack it using the original box and packing material and ship to the Service Department address above. Boxes and packing materials can be ob- tained from our service department for a nominal charge if you no longer have yours.
- Page 4 Design The CAV50 circuit is notable for its elegant simplicity. A passive control unit selects among inputs, and sets the signal level. The selected signal is routed to a triode input amplifier comprised of paralleled sections of a 12AX7A which is direct coupled to a cathode coupled differential phase inverter using high current triodes to provide balanced, low impedance drive to the push-pull output stage.
- Page 5 The cabinet or shelf should be open at both front and back. For more restricted installations, cooling fans are essential. The CAV50 is supplied with a cover for the vacuum-tubes, which can be secured by the four captive screws inside the cover. The cover provides protection from the hot surfaces of the vacuum-tubes.
- Page 6 50k ohms or higher. Since the pre out of the CAV50 inverts phase, it may be neces- sary to invert the speaker leads to maintain correct phase. See the section on "Getting the most out of your CAV50"...
- Page 7 With the speakers in phase the voice should be clearly focused between the two speakers. With the speakers connected out of phase, the voice will be diffused, with no identifiable source. Relative phase may be reversed by switching the "+" and "-" leads at one speaker only. CAV50 Owner’s Manual...
- Page 8 This switch turns the amplifier on and off. Because of the delayed warmup characteristics of vacuum tube equipment, a time delay muting circuit is incorporated in the CAV50 to mute the preampli- fier output (PRE OUT) at turn-on and turn-off. The PRE OUT connec- tions are grounded via a relay for approximately 90 seconds after the unit is turned on in order to suppress warm-up transient noises.
- Page 9 The speaker outputs (RIGHT and LEFT) of the CAV50 are phase correct. The preamplifier outputs of the CAV50 are phase inverting. If this part of your system has an odd number of inversions (as will be the case if the CAV50 preamplifier section is the only inverting component), then you must add one phase inversion in this part of the system.
- Page 10 Consult your conrad-johnson dealer for recommendations for your spe- cific system. Questions: If you have questions about the installation or function of your CAV50 do not hesitate to call Customer Service at (703) 698-8581. CAV50 Owner’s Manual...
- Page 11 Replacements The CAV50 uses nine vacuum tubes of four different types: two 12AX7A (V1 and V2), two 6SN7 (V3 and V4), one 12AU7 (V9) and four EL34s (V5 through V8). The brands of tubes we supply have been chosen by...
- Page 12 This biasing procedure should be performed whenever the amplifier’s output tubes are replaced and after each six months of average use. PLATE FUSE: Your CAV50 has been fitted with plate supply fuses which are designed to protect the amplifier circuitry in the event of output tube failure.
- Page 13 Weight: 44 lbs. Internal Fuses The CAV50 power transformer is protected by a fuse on the ac power line (F1) and by a seperate fuse (F2) for the secondary windings for the filament supply. Both fuses are located on the printed circuit board inside the chassis.
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