The ha fler p505 professional power amplifier installation and operation caution: if the speaker fuses blow, some distorted sound can be heard. Therefore if amplifier malfunctions, always check for blown fuses first. Lm135 the david hafler company 5910 crescent boulevard, pennsauken, new jersey 0810...
Specifications power rating: 400 watts per channel into 4 ohms at less than 0.04% thd from 20 hz to 20 khz with both channels driven. 255 watts per channel into 8 ohms at less than 0.025% thd from 20 hz to 20 khz with both channels driven. 800 watts into 8 ohms at less than 0.04% thd from 20 hz to 2...
Introduction the p505 is a high power two channel audio power amplifier designed and constructed for professional sound applications. It can deliver very high power into 4 ohm loads, simultaneously maintaining a level of performance normally associated only with ‘state of the art’ amplifiers of less...
Adequate ventilation is a primary consideration when installing any high power amplifier, because of its appreciable heat output. Cool air is drawn in through the foam filters on the sides, and the warm exhaust is to the rear. Make sure this flow is not impeded, and do not allow the system to work i...
Maintain a consistent polarity with respect to the ‘hot’ and ‘ground’ wires to the speakers. Most dual banana plugs have a tab identifying one side, which is customarily made the ‘ground’ side. In stereo speaker installations it is important to keep consistent phase relationships to preserve low fre...
Operation press the power switch to the right to turn the amplifier on. Operation will be signalled by the illuminated lamp in the switch. If it does not light, the most likely cause is a blown ac line fuse. That is the single fuse close to the switch inside the chassis. However, since that fuse is ...
Ac line connections for overseas use the power transformer supplied in p505 amplifiers sold in the usa is intended for 120 volt, 60 hz operation only. For use in other countries, a multi-voltage transformer is supplied in export versions, available at higher cost. It has dual tapped primary windings...
Trouble shooting hints check the speaker fuses first when there is little or no sound. A blown fuse will pass a low level distorted signal. If the pilot lamp is steady. Excessive dc at the output may be holding the relay open. If the lamp blinks, then the thermal protective circuitry has shut down t...
Circuit description amplifier stages are fully direct coupled (dc coupling). W ith a dual differential pair for the input, and a fully complementary mosfet output stage. Transistors q3. Q4, q5 and q6 form the differential input, while ql and q2 are constant current sources for the input pair. Potent...
Ic40 1 lm339n li inductor. I .4uh pi 1000 o h m s trimpot p 2 1000 o h m s trimpot p401 50.000 ohms. Level control t40 i power transformer t402 power transformer multi-voltage ry4oi dpdt relay s40 1 power switch qbi i5 tai i2 r p o i i rpoi i rf036 tai i6 tai i7 szi 1 3 sliii s402 s403 tr40 i tr402 ...
Service policy and limited warranty the ps0.5 power amplifier has been carefully engineered to provide many years of trouble-free service. Every unit is tested before and after a 24 hour ‘burn-in’ under load. Ensuring that any marginal component or operating condition is corrected, and that all oper...
