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Stereo Power Amplifier 400A Class A

Stereo Power Amplifier 400A Class A; Threshold (ID = 1917579) Ampl/Mixer
Stereo Power Amplifier 400A Class A; Threshold (ID = 1917047) Ampl/Mixer
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Stereo Power Amplifier 400A Class A; Threshold (ID = 1917047) Ampl/Mixer
Threshold: Stereo Power Amplifier 400A Class A [Ampl/Mixer] ID = 1917047 1400x568
Select picture or schematic to display from thumbnails on the right and click for download.
For model Stereo Power Amplifier 400A Class A, Threshold Corporation; Sacramento, Camarillo (CA):
Image from amplifier offered for sale on US website (front view). Checked against image in Threshold 400A brochure. This amplifier appeared to be in the original state.
 
Country:  United States of America (USA)
Manufacturer / Brand:  Threshold Corporation; Sacramento, Camarillo (CA)
Year: 1976–1979 Category: Audio Amplifier or -mixer
Semiconductors (the count is only for transistors) Semiconductors present. 2N3440 2N4250 2N5415 2N5876 2N5878 MPS6571 MPS-A42 MPS-A92
Main principle Audio-Amplification; Hi-Fi-High End products
Wave bands - without
Details Hi-Fi equipment
Power type and voltage Alternating Current supply (AC) / 120 Volt
Loudspeaker - This model requires external speaker(s).
Power out 200 W (1000 W max.)
from Radiomuseum.org Model: Stereo Power Amplifier 400A Class A - Threshold Corporation;
Material Metal case
Shape Rack
Dimensions (WHD) 19 x 7 x 12 inch / 483 x 178 x 305 mm
Notes

Threshold Stereo Power Amplifier Model 400A Class A

Power output 100W/channel, both channels driven, 8 Ohm load, 20Hz-20kHz.

THD < 0.1% at rated power, monotonously decreasing at lower power output.

IMD < 0.1% at rated power, monotonously decreasing at lower power output.

Harmonic distortion components dominated by second and third harmonics.

TIM < -75 dB at 10W output, 1.5 kHz squarewave mixed with 80 kHz sine wave at -20 dB.

Rise and fall time < 1 µs.

Slew rate max. 50V/µs or 25A/µs.

Loop propagation delay 20 ns.

Output current max. > 20A/channel (pulse), 5A/channel (continuous).

Bandwidth 0 Hz-500 kHz (+0, -4 dB).

Input impedance 23k.

Voltage gain 23 dB.

Net weight (2.2 lb = 1 kg) 51.5 lb (51 lb 8 oz) / 23.381 kg
Mentioned in -- Original-techn. papers. (Threshold Corporation 400A Data Sheet)
Literature/Schematics (1) -- Original-techn. papers. (Threshold Corporation 400A Service Manual)

Model page created by Aren van Waarde. See "Data change" for further contributors.



All listed radios etc. from Threshold Corporation; Sacramento, Camarillo (CA)
Here you find 4 models, 4 with images and 4 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.



  
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