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Summary of Contents for Conrad-Johnson ET3
- Page 1 Conrad-Johnson Owner’s Manual ET3 Vacuum-Tube Preamplifier conrad-johnson It just sounds right.
- Page 2 Although the ET3 has been designed to operate in an intuitively apparent way, you will find useful information on its installation and operation in this manual. Please take a few minutes to read the manual to better understand the features and capabilities of your Conrad-Johnson preamplifier.
- Page 3 Limited Warranty for Conrad-Johnson Components Conrad-Johnson Design, Inc. will provide service under warranty to the original owner on products sold new in the United States for the lesser period of three years from the date of purchase by the origi- nal purchaser, or five years from the date of shipment to the authorized conrad-johnson dealer.
- Page 4 Service Department conrad-johnson design, inc. 2733 Merrilee Drive Fairfax, VA 22031 The conrad-johnson service department can also be reached by e- mail at service@conradjohnson.com, 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.
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Page 5: Installation
Installation The ET3 Preamplifier dissipates up to nearly 30 watts of heat, and must be adequately ventilated. Mount the unit horizontally on a flat, hard surface, and take care that the ventilation holes in the bottom are unobstructed. Allow at least two inches of clearance above the unit and keep the cabinet or shelf open at the back. - Page 6 20k ohms or higher. Since this preamplifier inverts phase, it may be necessary to invert the speaker leads to maintain correct absolute phase. See the section on “Getting the Most From Your ET3 Preamplifier" for an explanation. Conrad-Johnson ET3 Preamplifier Owner’s Manual...
- Page 7 Phono Stage The conrad-johnson ET3 preamplifier is optionally available with your choice of high-gain or low gain phono stages. If your ET3 has a factory installed phono stage, there will be a label on the back panel saying “High Gain Phono Card Installed” or “Low Gain Phono Card Installed”.
- Page 8 When first connected to ac mains, or after an interruption of power, the ET3 will turn on in a default mode (after auto-muting), with the level set at 20, and the CD input selected. In subsequent sessions, as long as the ac mains has not suffered a power outage, the unit will turn on at the last used volume setting and input.
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Page 9: Remote Control
Remote Control All operations of the ET3 can be controlled by the wireless remote unit. MUTE: Pressing the mute button will cause the main outputs to mute and the level display to be zero. Pressing it again will restore the last level setting. Pressing and holding the mute button for more than three seconds will switch the ET3 into standby mode (all tube circuitry switched off). -
Page 10: Vacuum Tube Replacement
Vacuum Tube Replacement The line-stage audio circuit of the ET3 Preamplifier uses one type 6922 miniature twin-triode vacuum tube (V1) – note, (V2) is not used in this model. Units with the optional high-gain phono stage have three additional tubes – all type 12AX7 (V3, V4 and V5). -
Page 11: Absolute Phase
This will be the case if the number of phase inversions is even (or zero). The ET3 Preamplifier is phase inverting. If your system has an odd number of inversions, (for example, if the ET3 is the only phase inverting unit in the chain) then you must add one phase inversion. - Page 12 The warm up period can be expected to last about fifteen minutes. Questions: If you have questions about the installation or function of your ET3 Preamplifier do not hesitate to call Customer Service at (703) 698-8581. Conrad-Johnson ET3 Preamplifier Owner’s Manual...
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Page 13: Specifications
Net Weight: 13 lb net Fuses The ET3 has two power transformers each of which is protected by a fuse. These fuses (F1 and F2) are located on the main pc board near the transformers. There is also an ac mains fuse (F3) located in the ac mains inlet socket on the back of the unit.
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