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AmplifiersPre-AmplifiersDiscontinued
Estimated price (community-sourced)
$6,000
Around — community and catalog average, updates slowly
About the SL1
The CAT SL-1 is a two-channel, all-tube preamplifier introduced in 1985. The original SL-1 model has line-level and phono stages, a separate power-supply chassis, two line inputs, a phono input, two main outputs, and tape connections. The SL-1 name was used across multiple later revisions, including Reference and Signature versions; specifications and features vary by revision, so the figures below describe the original SL-1 family rather than a later named variant.
Specifications
Type: Two-channel tube preamplifier; Chassis: Main preamplifier and separate power supply; Inputs: Two line-level, one phono; Outputs: Two main outputs, tape input/output; Gain: Approximately 26 dB line, 47 dB phono (reported family specification; varies by revision); Frequency response: 0.1 Hz–600 kHz, +0/−3 dB line; 20 Hz–20 kHz, ±0.1 dB phono; Harmonic distortion at 1 V: <0.0005% line, <0.001% phono; Input impedance: 50 kΩ, 20 pF line; 47.5 kΩ, 180 pF phono (adjustable); Output impedance: 100 Ω; Maximum output: 50 V RMS; Tube complement and other details vary by revision.