check out this thread: http://forum.audiogon.com/cgi-bin/fr.pl?htech&1286763065. Exact same problem. I believe there was a way to fix this in there if I remember correctly. Good luck.
12 responses Add your response
The popping sound is comming through the Velodybe DEQ 12R subwoofer, which has a shielded power cord. The sub does not have a third prong. It shares the home theater power outlets. The sub interconnects are currently connected from the Audio research LS2B MKII line stage preamp. There is no popping comming through the 2 channel dedicated audio system.
I've done the fix. Call Harry Weisberg at VPI and he'll guide you through it. You need to go to Radio Shack and get a different capacitor (.06 vs. what's in there--the exact value I don't remember). It requires you to take off the long plate underneath the chassis and remove one capacitor while installing the other. No tools required--10 min. max to do the job. It was quite easy and there's NO pop anymore--dead quiet. It will cost you less than $2.00 and a trip to RS.
It's been about 2 years now. I'd tell you the exact one if I could--but that short term memory thing is holding me back. It wasn't a better capacitor, just one of a different value than their standard issue. Call Harry at VPI--he'll tell you the one and talk you through any insecurities you might have. I hate electrical stuff and this was really easy. It's definitely worth the time and small trouble. Bob
I used to get a slight pop with powering on and off my VPI Classic and interestingly enough, an even louder (much louder) pop with turning on the turntable switch-but not the vacuum switch) on my VPI 16.5 RCM. I eliminated both inadvertenly by replacing my power cords on all my equipment. My old power cords were all inexpensive LAT cords and I seem to recall that several years ago I went about lifting the grounding cord on two or three of them, so the grounding may be a big part of the benefit that I obtained when I replaced the cords. My new cords are even less expesive-DIY made from Supra LoRad wire obtained from Madisounds. For those of you who don't know, the Supra Lo-Rad is very good Swedish made cable specifically made for AC power cords and is extremely well shielded by an aluminum wrap. So, I don't know if the VPI gear emits significant RFI/EMI that causes the pops, or if the grounding eliminates some form of electrical line induced noise, but I can say that the problem can be eliminated without changing out capacitors.