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In Reply to: RE: Repair of Hafler DH-500 posted by Michael Samra on May 18, 2014 at 10:25:53
Thanks. I checked the MOSFETs with the standard diode tester and also by applying a charge to the gate and seeing that the drain-source goes from open to closed and the N set seems good, the P set is shot. Q12 and Q13 also check out fine. So the next step is to acquire the MOSFETs.
I applied a 1000 Hz sine wave and square wave to the right channel (no fuses on the left) and got a nice sine wave and square wave at the output with approximate gain of 26db so I am pretty sure this channel is good. However I will follow your advise and grease things up.
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I have a set of those MOSFETS, if you are interested.
Disassembled a DH500 some years ago with the intent of rebuilding with 'more audiophile parts'...but never did get the rebuilt going.
Send me an email and perhaps we can agree on terms.
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