Altec

428B

Amplifier, Pre

Main Details
Maker Altec Brand Altec Lansing Corporation Company
Function
Form Factor Part
Signal Path Analog Hardware
Made In United States
Date Produced 195?
Dimensions
(H × W × D)
Weight 3lbs
Power Source 6.3VAC 0.6A, 260VDC 10mA
Frequency Response 20Hz-20kHz ±1dB
Notes A-428B with minor revisions and changed model number to fit with revised nomenclature structure.

250A Console plug-in module. Available separately for custom installations.
Additional Specifications
Gain 40dB
Gain (Special Connections) 34dB
Source Impedance 30/50Ω, 125/150Ω, 250/300Ω 500/600Ω
Load Impedance 3050Ω, 125/150Ω, 250/300Ω, 500/600Ω
Output Level +20dBm
THD (50Hz-15kHz) 0.5%
THD (30Hz-15kHz) 1%
Equivalent Input Noise -120dBm
Output Noise -80dBm
Tube Complement 12AY7 (x2)

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