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Newly minted Aleph pcb's, uncut version! *Viewed: 2306 times.
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One channel cut apart into the three pieces. Viewed: 1932 times.
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Left front quarter view Viewed: 2338 times.
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Right front quarter view *Viewed: 1707 times.
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Top view of progress so far Viewed: 1649 times.
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Source and current sense resistors *Viewed: 1693 times.
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Now to select a pair of output devces from my fleet of 240s. These were measured and labeled for VGS over two years ago..... *Viewed: 2175 times.
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These two are reasonably close in VGS. Nelson says don't worry about measuring to those extra digits to the right of the 4.1 Viewed: 1991 times.
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Nearly completed, just need three 750 ohm resistors. Of course the electronics store are NOT open in Utah on Sundays. Viewed: 1933 times.
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Sucess! The amp up and running. Showing idle current on negative rail. It turns out that the Tektronix TM500 power supply was just large enough to let the amp idle. A larger supply will be needed for actual power output tests. Viewed: 2330 times.
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9.9 Watts/8 ohms Clip Point! Distortion is .22%. This is just below the positive peak clip point...... Viewed: 1506 times.
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2.5 Watts/8 ohms Distortion is .05%. A bit of hum in the distortion output trace is probably from the use of all the test clip leads. Viewed: 1046 times.
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1 KHZ square wave Viewed: 1032 times.
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1 khz square wave just before clip point. This rnging is not nearly as bad as it was in the SMT version. *Viewed: 1042 times.
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The 4 ohm clip point! Viewed: 1031 times.
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The test setup. Sound technology 1701B, Tektronix 7704A Scope, various Tektronix TM-500 meters, etc. Dale 4 ohm 50 watt non-inductive dummy loads. Indeed, this is a temporary setup. The power supply rail level is controled from the variac. Viewed: 1683 times.
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Top side of prototype board Viewed: 1255 times.
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Bottom of prototype board Viewed: 1174 times.
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Most of the required parts gathered . I will test the board three ways, CRC, CLC, and straight! Viewed: 1402 times.
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Start by installing the rectifiers on the heat sinks. Leave them a tad bit loose for now and then insert the heatsink assemblies closest to the edge of the pcb. *Viewed: 1461 times.
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Being sure that the sink is square then proceed to solder it and the rectifier in place. Then snug the screw up. I choose to insulate my diodes with mics/grease fomr the sinks for safety reasons and because the sinks are pretty close together. Doing so will eliminate any possibility of a catastrophe from happening. Viewed: 1341 times.
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All 4 rectifiers in place on Thermalloy 6032 heat sinks. *Viewed: 1315 times.
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Completed board ready for testing. *Viewed: 2234 times.
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