Conrad-Johnson ET3 Preamplifier Owner’s Manual
Specifications
Line Stage
Gain: 25 dB
Maximum Output: 20 Vrms
Bandpass: 2Hz to more than 100kHz
Hum and Noise: 98 dB below 2.5V output
Distortion at 1.0 V output: less than .15% THD or IMD
Phase: inverts phase of all inputs (including phono) at main out
Main Ouput Impedance: 100 ohms
Optional Phono Stage
Gain:
High Gain: 54 dB
Low Gain: 40 dB
Hum and Noise: 80 dB below 10 mV input
RIAA Equalization: within +/- .25 dB of RIAA specification
Mechanical
Dimensions: 13.125"D x 19"W x 3.315"H
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. A failure of any
of these fuses is a symptom of a more serious problem, and a
competent service technician should be consulted. In no event
should a fuse be replaced with a value or type different than that
originally supplied. Correct fuse values are:
If configured for 100 or 120V:
F1 3AG type 3/4 amp, slow blow
F2 3AG type 1/2 amp, fast blow
F3 5 x 20mm T800 (800 ma slow blow)
If configured for 220 or 240V:
F1 3AG type 1/2 amp, slow blow
F2 3AG type 1/4 amp, fast blow
F3 5 x 20mm T400 (400 ma slow blow)
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