Related Manuals for Conrad-johnson design Evolution 20
Summary of Contents for Conrad-johnson design Evolution 20
- Page 1 Conrad-Johnson Owner’s Manual: Evolution 20 Vacuum-Tube Preamplifier conrad-johnson It just sounds right.
- Page 2 Evolution 20. NOTE THAT THE Evolution 20 LINE STAGE IS PHASE INVERTING. See the section entitled "Getting the most from your Evolution 20" for details on correct hookup in your system. EVOLUTION 20 OWNER’S MANUAL...
- Page 3 Evolution 20 1. conrad-johnson design, inc. warrants to the original purchaser that the Evolution 20 will be free of defects in materials and workmanship for a period of three years from the date of original purchase. 2. conrad-johnson will repair defective units without charge for labor or...
- Page 4 EVOLUTION 20 OWNER’S MANUAL...
- Page 5 The Evolution 20 requires an ac power line providing between 108 and 125 volts at 50 to 60 Hz. Alternatively, the Evolution 20 is optionally available for operation on 100, 220, or 240 volt power lines.
- Page 6 Evolution 20 inverts phase, it may be necessary to invert the speaker leads to maintain correct absolute phase. See the section on "Getting the most out of your Evolution 20" for an explanation of this. USE OF EXTERNAL TONE CONTROLS OR OTHER EXTERNAL SIGNAL PROCESSING DEVICES: Use Tape 1 and Record 1 for your tape recorder.
- Page 7 .75 dB. At the full extreme position positions, there is about 3.75 dB difference be- tween the two channels. LEVEL: The Evolution 20 volume control is a twenty-three position stepped attenuator, selecting among twenty-three pairs of precision resistors.
- Page 8 ACUUM TUBE REPLACEMENT Each channel of the Evolution 20 uses five vacuum tubes: one 6CW4 and four 6GK5s. Each type has been carefully chosen for its particular circuit application. It is well known that tubes of a given type vary sonically depending on the manufacturer.
- Page 9 EVOLUTION 20 TUBE COMPLEMENT V1 and V2 type 6CW4 V3-V10 type 6GK5 EVOLUTION 20 OWNER’S MANUAL...
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Page 10: Absolute Phase
If your system has an odd number of inversions, then you must add one phase inversion. This will be the case if the Evolution 20 is the only unit in the chain that inverts phase. THIS IS CONVENIENTLY DONE BY REVERSING THE POSITIVE AND NEGATIVE CONNECTIONS TO YOUR SPEAKERS (be sure to reverse both channels). - Page 11 Warm up the Evolution 20 before listening: The sonic performance of the Evolution 20 improves noticeably as the unit warms up. The mid- range becomes more lucid, the highs smoother, and the soundstage expands. The warm up period can be expected to last several minutes.
- Page 12 Distortion at 1.0 v output: less than .25% THD or IMD Phase: line section inverts phase of all inputs (including phono) at main out Ouput impedance: less than 200 ohms Mechanical: Dimensions: 19"W x 7"H x 16 3/8"D Net Weight: 60 lbs. EVOLUTION 20 OWNER’S MANUAL...
- Page 13 SERVICE In the event your conrad-johnson Evolution 20 stereo preamplifier re- quires service, repack it in the original packing material and ship via United Parcel Service (UPS) to: Service Department conrad-johnson design, inc. 2733 Merrilee Drive Fairfax, VA 22031 Be sure to include a copy of your sales receipt from the original pur- chase, along with a note explaining the problem you are having in as much detail as possible.
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