Hafler DH-200 specification

5 n Select the two round fuse holders, and two each 1/2” rub- ber washers, lockwashers and nuts. First install the rub- ber washer on the holder, so it will be outside the chassis, and then fasten the fuse holders at LF and RF, with the tip lugs pointing towards each other, toward the center of the chassis.

6 U Select the two input sockets and 4 sets of #4 hardware. Install the sockets inside the chassis at LS and RS so that the short lug of each socket is near the hole between the two sockets.

7 0 Select the single ground lug (with lockwasher teeth) and one set of #4 hardware. Install it between the input sockets, pointing toward the bottom. Bend it out for ac- cess, and twist it 90° for easier insertion of a wire later. Be sure this lug is tight, as the locking teeth must cut through the chassis paint for a good ground connection.

8 ri Select the four-lug diode block DB, the long # 6 screw, and a nut. Install the rectifier in the center hole near the rear of the chassis, with the plus (+) terminal located over the tiny indexing hole at position four. Correct orientation of this rectifier is essential for proper wir- ing.

9 n Select the single fuse clip, and one set of #4 hardware. In- stall the clip in the right front chassis hole FC, closest to the foot.

10 0 Select the two dual fuse clips and four sets of #4 hard- ware. Install these in the pairs of holes FL and FR on either side of the center of the chassis.

11 0 Select the 5-lug terminal strip and two sets of #4 hard- ware. Install it in the front holes TS, next to the single fuse clip. Note the position of the mounting lugs (to the right) in the pictorial diagram.

NOTE: Kits provided with the multiple voltage power transformer for use in locations outside the United States having a line (mains) voltage other than 120 VAC are also supplied with an additional two- lug terminal strip which is to be installed using an additional set of #4 hardware on the other side of the chassis, below the dual fuse clip FL.

12 0 Select the power switch. Install it with the red window to your right as viewed from the front. The switch snaps into chassis hole PS from the outside.

13 q Select the AC line cord and the plastic strain relief. Separate the two conductors for 2”. Cut 1” off one of the two leads, and strip 1/4" of insulation from each lead. Twist the strands tightly, and tin each end. Make a sharp 'V' in the cord 81/2" from the longest cut end by bending it back on itself. Install the relief with the small end nearest the cut end of the cord. Crimp the two halves of the relief around the wire at the 'V' with heavy pliers, to partially form it before insertion into back panel hole AC. Then grip the larger diameter with the plier tips, squeeze it tightly, and insert the cord and the relief from the out- side. A flat side of the relief mates with the hole shape, and it snaps into position when fully inserted.

Connect the shorter lead to FC lug #l. (S). Connect the longer lead to the lower hole of TS lug #2. (S). Note that lug 2 is the second protruding lug on the terminal strip. It is not the mounting bracket for the terminal strip. Soldering this lead to the lower hole now will make later connections to the top portion of the lug easier. Be sure no stray strands of either line cord conductor are left unsoldered.

1 4 Prepare a 61/2" green wire. Connect one end to dual fuse clip FL lug #l. Connect the other end to the other dual clip FR lug #l. (S).

1 5 Prepare a 61/2" white wire, Connect one end to FR lug #3. Connect the other end to FL lug #3. (S).

1 6 Prepare two 7” white wires. Start with one wire project- ing 3/4" beyond the other, and twist them uniformly together throughout their length. Connect the project- ing end to RF lug #l. (S). Connect the corresponding end of the other wire to RFlug #2. (S). Place this pair over the right edge of the chassis.

170Prepare two more 7” white wires. Start as before with one wire 3/4" longer, and twist them together. Connect the longer end to LF lug #2 (S). Connect the other wire to LF lug #l. (S). Place these wires off to the left.

18 0 Prepare an 8” green wire and a 10” white wire. Start with the white wire 3/4” longer than the green wire, and twist them uniformly together. Connect one end of the green wire to the lug on black output terminal LB. Con- nect the corresponding end of the white wire to red terminal LR. (S). Place these wires off to the left.

DH-200 specifications

The Hafler DH-200 is a well-regarded power amplifier that has earned a dedicated following among audio enthusiasts since its release in the early 1980s. Known for its excellent performance and reliability, the DH-200 has become a staple in many home audio systems.

One of the key features of the DH-200 is its high power output, delivering 100 watts per channel into 8 ohms and 200 watts into 4 ohms. This robust power handling capability makes it suitable for driving a wide range of speakers, from compact bookshelf models to larger floor-standing designs. The amplifier's low distortion and high current output ensure that it can reproduce dynamic and intricate musical passages with clarity and precision.

The DH-200 utilizes a unique circuit topology that incorporates a high-performance, complementary push-pull output stage. This design minimizes crossover distortion while providing excellent linearity and frequency response. The frequency response extends from 20 Hz to 20 kHz, matching the full range of human hearing and allowing for a natural reproduction of both low and high frequencies.

Another notable technology in the DH-200 is its use of a toroidal transformer, which contributes to the amplifier's efficiency and low noise operation. Toroidal transformers are known for their compact size, reduced electromagnetic interference, and improved power supply regulation, which translates into cleaner audio performance.

In terms of build quality, the Hafler DH-200 features a rugged chassis and a minimalist front panel design. The amplifier is a two-channel unit, with individual volume controls for each channel, allowing for precise adjustments. The rear panel is equipped with standard RCA input connections and binding posts for speaker outputs, making it compatible with most audio sources and speaker systems.

The DH-200 is also praised for its thermal management, featuring multiple heat sinks to dissipate heat effectively during extended use. This design helps to ensure long-term reliability, even under demanding listening conditions.

In conclusion, the Hafler DH-200 is a power amplifier that stands out for its exceptional sound quality, powerful performance, and robust build. Its combination of advanced technologies, such as a complementary push-pull output stage and toroidal transformer, make it an enduring choice for audiophiles seeking a reliable and high-performing amplifier for their home audio systems. Whether for casual listening or critical listening sessions, the DH-200 has proven to be a versatile and gratifying component in any audio setup.