Ty for the replies
Try a simple small gauge wire from the back of the pacific to your ground screw on the back of your pre amp
Take note and reply
If this solves it let’s go to other steps.
Have you tried a different pair of RCA cables ?
Have you tired just using one of the rca cables at a time ? take note and reply
So there any other devices in close proximity to the left side of the pac ? If so what device
Is the hum a steady common 60 cycle hum ? Or is it a buz thst has a hiss component or warble sound ?
Have you tried other tubes ?
Have you tried to remove the set tubes and comment.
if the hum persists after set tubes are removed this helps greatly
Is the pacific dac stacked with a device above it or below it
Let me solve your issue I’m pretty sure I can
I look forward to your replies
Greeting Lampi family and future adoptees
Referencing the unfortunate noise/hum I experienced with the recent addition of the CJ GAT2 preamp and Pacific DAC, I'm posting this update for clarification and learning purposes; that while the issue has yet to be resolved, it has become evident that there was nothing "wrong" or defective with Lampizator Pacific DAC as it was suggested. Thanks to the members here, especially Larry, it's been demonstrated that the electrical environment of ones listening space is a big factor as well as the interaction of different electronics, in terms of the grounding scheme and the resultant "grounding plane/potential" that can cause the noise/hum issues. In short, tread lightly and don't be coming on here tryin to throw shade, lest you earn the wraith of the "Lampi Posse". Moving forward and for those interested look for updates in my post. Happy listening.
Very well said. I wound get bashed for saying it lol.If the hum goes away by replacing CJ preamp, and if the CJ preamp does not make the Lampi with the 242 tubes in it sound magical (this is very preamp dependent) sell it. There are many preamps. The best one is the one the gels with the 242 in the Lampi. People online will spend their lifetime comparing AR, VTL, CJ. It doesn't matter. All those preamps are mediocre and compared to what can be done once a preamp fits in with Lampi 242
Highstream, Redphu, Al
Are we still on the Lampi hum thing? On one hand, it seems that based on several reports, there no obvious “one size fits all” root cause of the problem. Hum can be caused by almost anything. As Al wisely points out, did you rule out proximity effect? No amount of grounding scheme changes is likely going to solve that issue if the components that cause the problem are too close to each other so that they interact somehow to cause hum that can be eliminated simply by re-positioning. You can also change RCA to XLRs all you want but this is not a cure for hum due to proximity effect.
Is the hum a Lampi problem or due to another piece? Seems to me the answers we’ve heard are all over the place. Systems can be perfectly quiet until one piece overturns the apple cart. It could be the Lampi, or a phono pre-amp, or just about anything else based on the individual posts that have appeared. These gremlins are often a real nightmare to sort out.
Go ahead and do all the common sense solutions proposed by Al and others. Add or omit ground cables. Change what you think might be a bad capacitor. Turn to the east and say a prayer.
When it comes right down to it, here’s the key question- do you still have hum or not? You’d be surprised at how many people just want to deny the hum is there. They rationalize it’s just low level hum and therefore is not big deal. Nonsense. If you have any hum, you are not hearing your system to its full potential. Plain and simple.
On the other hand, the solution may be more straight forward than you realize regardless of cause (except proximity effect)
See post #28
If you have hum, again, any hum, I don’t understand why you wouldn’t try the solution several of us have found to be completely successful in eliminating this dreaded nuisance. For anything other than power amps, I wouldn’t hesitate to try a Furman IT Reference 15i or 20i isolation transformer used ONLY for the culprit component that is the cause of the hum. No need at all to use it for any component that’s not causing the hum problem. Not only has it solved the hum problem for several forum members, it worked for Lampi owners as well as owners of other gear such as phono stages.
Quite honestly, since buying these on line cost about $1200 (for the 15i) and since they are generally fully refundable for 30 days, there is really no reason that I can see as to why someone with any non-proximity effect hum wouldn’t try this simple, straight forward and inexpensive solution that can banish the hum gremlin forever. Good luck!
If the hum goes away by replacing CJ preamp, and if the CJ preamp does not make the Lampi with the 242 tubes in it sound magical (this is very preamp dependent) sell it. There are many preamps. The best one is the one the gels with the 242 in the Lampi. People online will spend their lifetime comparing AR, VTL, CJ. It doesn't matter. All those preamps are mediocre and compared to what can be done once a preamp fits in with Lampi 242
Do you consider that Steve option - using a Lampizator with volume control that can match any preamplifier degrades sound quality? IMHO it seems to be the best technical advice, independently of tube.
Possible that is a good solution. Though Steve's reactions don't show that the 242 is working its magic, we will know only after he swaps over to PX25. Either that or Steve is like those Alistair MacLean secret agents who do not show much emotion
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