User manual HAFLER DH-220

[. . . ] THE POWER AMPLIFIER INSTRUCTIONS for OPERATION and KIT ASSEMBLY CAUTION: IF THE SPEAKER FUSES BLOW, SOME DISTORTED SOUND CAN BE HEARD. THEREFORE IF AMPLIFIER MALFUNCTIONS, ALWAYS CHECK FOR BLOWN FUSES FIRST. THE DAVID HAFLER COMPANY 5910 Crescent Boulevard, Pennsauken, New Jersey 08109 Hafler DH-200 Power Amplifier serial number in all communications INTRODUCTION The Hafler DH-220 is a two channel audio power amplifier designed to the very highest performance standards. It is available either as a kit, or fully assembled. Its 115 watt per channel power rating is sufficient for driving all loudspeakers in home applications, and its design assures extremely low distortion of all types. [. . . ] Connect the cut end from the left to TS lug #2. Connect the other end to the lower hole of TS lug #5. Place this pair along the front edge of the chassis, under the power switch, with the ends projecting from the front corners of the chassis. 26 il Select a 1 megohm resistor (brown-black-green) and trim the leads to 1/2". One of these 3 leads has already been soldered to the lower lug hole. 27 n Select the diode and trim its leads to 1/2". Note that one end of the diode is marked with a stripe (or an arrow head will point to that end). Select a spade connecting lug, and solder it to the other end. Place this wire down against the chassis, and connect it to the PS lug on the right, near the edge of the chassis. The proper way to attach a spade lug to a wire is to first cut the bared wire end to the right length (no more than 1/4" so that the insulation will be securely gripped by the longer, outer tabs, while the wire does not protrude into the spade clamp area. Bend the 8 29 shorter, middle set of tabs tightly around the bare wire, and then bend the longer tabs around the insulation. Then flow solder into the joint around the bare wire, keeping the solder away from the spade section. Select another spade lug, and solder it to the other end. Connect it to the PS middle lug. 30 0 Select the 0. 39 mfd (. 39K) capacitor and trim its leads to 1/2" Connect one lead to TS lug #4. 31 0 Select the two large round capacitor brackets, the two large capacitors, and 6 sets of #6 hardware. Place a bracket around the bottom of each capacitor, and fasten it snugly with one set of hardware through the clamp. Note the direction of insertion of the screw for easy servicing access in the future. The clamps need not be tightened now - just made snug. Place each assembly on the chassis, at CL and CR, noting the position of the clamp, and fasten them securely. Be sure no wires are trapped by the bracket. Then loosen the clamps, and position the capacitors so that each + terminal is positioned as in the pictorial diagram. The + terminal will usually be so marked, but if not, it may be identified by a red dot. [. . . ] Install one nut all the way onto the switch collar, and follow it with the indexing washer with its lugprojecting towards the handle lever. Mount the switch on the bracket so that the lever points in the direction of the bracket flange, and the indexing lug engages the locating hole in the bracket. Secure it with the lockwasher and the second nut. 9 0 Select the two machine screws and nuts, and install the switch bracket between the two transistors at the rear of the right module, so that the switch lever points towards the fins. [. . . ]