The Dynaco ST-400 is often considered the best dollar-to watt value in vintage HiFi. It's lucid, utterly uncoloured neutrality reveals delicate nuances and musical shadings in the best program material - one result of achieving unconditional stability with varying loudspeaker loads. This example has all of the bells and whistles, including the meter kit and the optional fan upgrade. There are a few discolored spots on the faceplate, and a few marks on the chassis, but where else are you going to find a 200 Wpc amp under $500?
- Production
- 1972-75
- Condition
- 9/10
- Serial No.
- 28416194
- Restoration
- Full 30-point service check
- Set bias
- New feet
- Cleaned controls, switches, and chassis
- Factory Specs
Type Solid-state stereo power amplifier
Power output 200 watts per channel into 8Ω (stereo), 600 watts into 8Ω (mono)
Frequency response 20Hz to 20kHz
Total harmonic distortion 0.25%
Damping factor 30
Input sensitivity 1.6V
Signal to noise ratio 95dB
Speaker load impedance 4Ω to 16Ω
Semiconductors 46x transistors, 47x diodes, 2x silicon controlled rectifiers, 4x IC
Dimensions 17"W x 7"D x 14"H
Weight 52 lbs.
- Documentation
Dynaco Stereo 400 M Service Manual
- The History of Dynaco
- Founded by hi-fi pioneer David Hafler and Ed Laurent in 1955, a small company by the name of Dynaco unknowingly would become the most popular tube amplifier company of all time. Five years prior in 1950, David Hafler and his friend Herb Keroes started up the company Acrosound, dedicated to building audio quality...
[ Read More ]
- Liner Notes
The Stereo 400 represents the pinnacle of amplifier achievement. This is your ultimate amplifier, unequivocally superior on three counts: sound quality; thermal (heat sink)design; and protection of the loudspeaker load from excessive signals. The Stereo 400 initiated the "second generation" of Dynaco solid state designs distinguishing the next plateau of solid state audio technology. The Stereo 400 has established new standards for conservative design and operation. Its mammoth heatsink-four times that of some with similar ratings-provides over 1,000 square inches of radiating area so that continuous operation, even at maximum power, is achieved into 8 ohms without a fan. Yet chassis space is provided for easy installation of an optional "whisper fan" for severe service applications, and the heat sink is designed for maximum efficiency with forced air flow.
- Stock No.
- 8063912837341
The Dynaco ST-400 is often considered the best dollar-to watt value in vintage HiFi. It's lucid, utterly uncoloured neutrality reveals delicate nuances and musical shadings in the best program material - one result of achieving unconditional stability with varying loudspeaker loads. This example has all of the bells and whistles, including the meter kit and the optional fan upgrade. There are a few discolored spots on the faceplate, and a few marks on the chassis, but where else are you going to find a 200 Wpc amp under $500?
