EXPIRED For Sale David Hafler Co. DH200 Power Amplifier

Further Information

FURTHER PRICE REDUCTION David Hafler DH 200 MOSFET STEREO Power Amplifier manufactured in America.  240 volt power supply.  Serviced including recap by Esmond Pitt 2024.  Excellent performance. 100watt per channel.  Less than 0.02% THD up to 100 watts both channels driven continuously.

The case has some minor cosmetic imperfections. 

Specifications      

Output Power

Stereo

Less than 0.02% THD at any power level up to 100 watts per channel, both channels driven continuously, from 20-20,000 Hz.

Audio Input

One stereo pair of 1/4" RCA jacks

22 kΩ.

1.5 V RMS input for 100 watts into 8Ω.

SMPTE Intermodulation Distortion

< 0.005% from 1 - 100 watts into 8Ω.

THD at 100 WPC into 8Ω (typical)

1 kHz: 0.0015%

10 kHz: 0.005%

20 kHz: 0.012%

Frequency Response into 8Ω

10 - 40,000 Hz at 100 watts ±0.5 dB.

1 - 100,000 Hz at -3 dB at 1 watt.

Crosstalk (typical)

66 dB at 20 Hz.

66 dB at 1 kHz.

60 dB at 20 kHz.

Signal to Noise Ratio

>100 dB unweighted, referred to 100 watts.

Damping Factor

150 at up to 1 kHz into 8Ω.

50 at up to 10 kHz into 8Ω.

Rise Time

2.5 µS from 10% to 90% with a 60 V p-p 10 kHz square wave.

Slew Rate

30 V/µS with a 60 V p-p 10 kHz square wave.

Semiconductors

8 power MOSFETs: two pairs of complementary Hitachi 2SK134 and 2SJ49 lateral MOSFETs per channel.

Each of these power MOSFETs was individually tested, graded and sorted by Hafler.  Each was stamped with a number from one to five and assembled accordingly into amplifier modules.

26 transistors.

24 diodes.

4 Zener diodes.

1 bridge rectifier.

Power Input

240 volts VAC

Rated 370 VA maximum, marked 600 W maximum.

Actual power consumption is much less.

Quality

Made in the United States of America (Pennsauken, New Jersey).

Size

5-1/8 x 16 x 10-1/2 inches, HWD.

Weight

26 pounds (11.8 kg).

Price, USA

Please refer to full review on the link below.

https://www.kenrockwell.com/audio/hafler/dh-200.htm