When using a DC filament supply on a DHT... - Page 4 - diyAudio
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Old 17th September 2003, 10:33 PM   #31
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Join Date: Sep 2002
Location: Oregon, USA
That's a good idea. I was reading through some other stuff and realized that I could have bent a pot's terminal to touch the chassis, or something like that - that could probably cause this too.
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Old 18th September 2003, 05:03 AM   #32
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Location: Oregon, USA
Well, I think it was mostly my CD-ROM drive. The darn switching power supply in that turned its analog output into a picket fence, and I guess one of my channels is more sensitive to that high frequency noise. I put my older CD player back in, and everything's happy. I did re-flow all solder joints on that input tube just for good measure. Also added the bypass caps for the regulator ICs. Things seem better now. I also re-did the grounding inside the amp, moving the chassis connection to the front of the amp near the inputs. That reduced the amount of HF hash in the output significantly.

So now I need to find an inexpensive CD player/transport that has a digital output (mine doesn't), and doesn't produce picket fences on its output.
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