ESC
438C

438C

BrandAltec, Altec Lansing
ManufacturerAltec Lansing Corporation, LTV Ling Altec, Inc.
FunctionDynamics (Compressor Amplifier)
Produced1965
CountryUnited States
Form Factor19" Rackmount
Signal PathAnalog Hardware
Dimensions48.3 × 8.9 × 15.2 cm (W × H × D)
Weight8.5lbs
Power115VAC, 60Hz 22W
Frequency Response40Hz-10kHz ±1.5dB
Gain (Mic)90dB
Gain (600Ω Source)40dB
Maximum Compression30dB
Power Output+24dBm
Compression Ratio (0dBm Threshold)2:1
Compression Ratio (+16dBm Threshold)4:1
Input Impedance20kΩ
Source Impedance150/250Ω (Optional: 30/50Ω)
Load Impedance150Ω, 600Ω
Equivalent Input Noise-119dBm
Output Noise Level-50dB
Attack Time50ms
Release Time (63% Recovery)0.3s to 1.3s (Adjustable)
THD (25dB Compression, 35Hz-15kHz)1.5%
THD (30dB Compression, 35Hz-10kHz)2.5%
Tube Complement12AY7, 6BC8, 6CG7, 6AL5
FinishDark Green
Channels1 Channel