DH-100 Update: I isolated the amplifier and still had the problem. I re-inspected the amplifier circuit and discovered I put .047 mf caps in the op-amp circuit that should have been 47 pf caps ( I think that's 100x less f). They were the only caps that didn't come in the re-cap kit I bought (my bad; oops). All it took was a quick trip to the electronics shop and a couple of minutes with the soldering iron, if you don't count the 1,000,000 hours I spent troubleshooting and test listening. I just finished testing it and it sounds awesome: is "stage" when you hear different instruments in different spots? if it is that it's got great staging. The bass is a bit understated and the highs can be too forward with pop/rock, but nothing that gentle twists of the tone control knobs won't hide. I'm so relieved to get this right; it was close to becoming an anchor. I could have never limped through this without the input I got here on Audiogon. Thanks!
Hafler DH-100 - what should this should this sound like?
I have never heard a perfect example of one of these so I no idea what the target is here. I have a DH-100 that i completely recapped and replaced all the OP-AMPS, JFETs, Regulators, diodes, etc. I more or less replaced everything except the resistors and the pots. I have tested it and it has exaggerated bass and sounds a bit muffled to me. However, it is totally quiet; with no inputs, I can run it into my 75 watt amp (Speakercraft BB275) all the way up and there is no noise at all. The phono section will pickup the 60 cycle transformer hum but connecting a TT with a ground makes that go away, too. I've been thinking there is something wrong but I can't find anything. I have even checked all the resistors and found them to be in spec. I have run my amp through the "record" output and the heavy bottom muffled sound goes away. I do like the less than perfect "fat" sound but I have to run this with the bass backed off most the way to make it listenable and I normally bump the bass up a touch on other devices. What should this thing sound like?
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- 8 posts total
- 8 posts total