Heathkit

W-4AM

Amplifier, Power

Main Details
Maker Heathkit Brand Heath Company Company Daystrom, Incorporated Company
Function
Additional Model ID Williamson Type Amplifier W-4A, W4-AM
Channels/Tracks
  • 1 × Channel
Signal Path Analog Hardware
Made In United States
Date Produced 1955
Dimensions
(H × W × D)
Weight 23.25lbs (Net), 28lbs (Shipped)
Power Source 105-125VAC, 50/60Hz 115W
Frequency Response 10Hz-100kHz ±1dB
Additional Specifications
Output Power 20W
Maximum Average Output 27W
Peak Power 36W
THD (1kHz, 20W) 1%
IMD (60Hz:3kHz, 20W) 2.7%
SNR (0.25W) 76.2dB
SNR (20W) 95.2dB
Impedance Load 4/8/16Ω
Feedback Factor 22.6dB
Damping Factor 28.5dB
Input Sensitivity (5W) 1V
Output Tube 5881
Tube Complement 6SN7GT (x2), 5881 (x2), 5V4G
Output Transformer Chicago Standard Transformer
MSRP (1955) $39.75

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