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Heathkit W4-AM

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Technic details

Specifications

Type:
Tube Power Amplifier
Power Output:
20W (At 1kHz with less than 1% THD)
Maximum Output:
27W
Peak Power Output:
36W
Frequency Response:
20Hz to 20kHz (At 1W output)
Harmonic Distortion:
0.06% (At 0.25W, 1kHz)
0.08% (At 0.25W, 20Hz)
0.07% (At 0.25W, 10kHz)
0.15% (At 20W, 1kHz)
1.4% (At 20W, 20Hz)
0.94% (At 20W, 10kHz)
Phase Shift:
30 degrees leading at 15Hz
90 degrees leading at 4Hz
Hum and Noise:
76.2dB below 0.25W output
95.2dB below 20W output
Feedback factor:
22.6dB (Fixed)
Damping Factor:
28.5dB to 1 (Fixed)
Independent of output impedance
Output Impedance:
4, 8 and 16Ω
Valve / tube complement:
6SN7 x 2
5881 x 2
5V4G x 1
Case material:
Metal, TUBES VISIBLE
Power Requirements:
AC 105 - 125V, 50 / 60Hz
Power Consumption:
115W (At 117V)
Dimensions (W x H x D):
15.25” x 7” x 8.5” / 387 x 178 x 216mm
Weight:
23.25 lbs / 10.55kg (Net)
28 lbs / 12.712kg (Shipping)
Year:
1957 ???

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