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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Volume Adjustment Thump Troubleshooting
Volume Adjustment Thump Troubleshooting
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Old 19th November 2019, 03:11 PM   #21
Douglas Blake is online now Douglas Blake  Canada
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Quote:
Originally Posted by ubergeeknz View Post
Measure between the inside contact of the RCA socket and the outside (ground)
Alternatively...

Plug a cable into the RCA connector... on the other end, read between the center pin and the shield ring.
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Old 19th November 2019, 03:15 PM   #22
Douglas Blake is online now Douglas Blake  Canada
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Quote:
Originally Posted by Hypnoglitz View Post
Douglas- I get now that the vendor was perhaps out for more money. Lesson learned.
There's a lot of that going around.

You said "capacitor" and the salesmaker said "caching!" found the most outright stupidly expensive part and offered it to you.
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Old 19th November 2019, 03:21 PM   #23
Douglas Blake is online now Douglas Blake  Canada
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Quote:
Originally Posted by Hypnoglitz View Post
Swapped out the dac with an alternate. I could still hear the noise but it was much quieter. I also swapped out the preamplifier with an alternate passive preamplifier, no noise, and I really cranked it.

So maybe the trouble is with the preamplifier? My head is spinning from this.
There is a risk, although remote, that DC on the DAC's output may have damaged the input capacitor in your preamplifier.

The general arrangement with these things is that the cap's on both ends would have their negative poles connected to the RCA jacks. If you got DC on the output of the DAC it might have reverse polarized the cap on your preamplifier input and damaged it.

It's unlikely... but it can happen.
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Old 19th November 2019, 03:57 PM   #24
DF96 is offline DF96  England
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Were any ground leak resistors damaged during the cap change?
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Old 19th November 2019, 06:17 PM   #25
Hypnoglitz is offline Hypnoglitz
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I suppose a damaged component is possible. I discussed the trouble with my preamplifier manufacturer and Ive decided to send it in for a check and fix if needed.
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