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What's Wrong With My Cartridge/Setup?

Please help this newbie sort out a problem with my cartridge, tonearm or installation.

Here's my system: Shure V15VxMR Cartridge mounted on an older Rega Planar 2 Turntable with glass platter into either an Audio Experience Concerto Tube Phono Preamp or a Conrad Johnson SC-22P SS FET Phono Preamp (in a homebrew box) into a CJ Preamp and Anthem Amp-1 tube amp. This system is new to me (most parts are used with the exception of the cartridge which was bought with 'only a few hours use' and the phono preamp (which I ran for 30 hours burn-in).

So here's the problem: My LPs sound like crap. The highs are badly attenuated, the lows are a weak and the entire sound lacks punch. The sound field is totally flat. I've compared a number of vinyl LPs to CD releases of the same material played on my Music Hall CD-25 and the CDs sound considerably better than the vinyl.

I've played with some of the mechanical parameters of the cartridge (tracking alignment, VTA, weight, anti-skating) using a test LP and a scope (as well as my ears). The changes generally have a audible effect but are small compared to the magnitude of the problem. The loading the cartridge is 'seeing' was measured to be very close to the spec of 47K ohms and 250 pF. The two phono preamps I've tried sound pretty similar, so the problem would appear to be with the cartridge/turntable/tonearm setup.

Any ideas? Could cartridge break-in account for such a major sonic impact? Is it fair to compare an LP to a CD of the same material? Help!!!

.... Brian
odourboy
dougdeacon
3,338 posts
 
Not much to add to Dan_Ed's and Viridian's posts. A flat sounding soundstage will result from a system that's wired out of polarity.

Just for testing, try reversing your speaker or power amp + and + connections, whichever is easier to reach. IF LP's suddenly sound more alive, deep and focused then just for haha's throw in a CD. It will sound flat, dull and less focused than normal. Now you know you've got a polarity inversion somewhere between cartridge and line stage. Return your speaker terminals to normal and reverse your cartridge clips or phono plugs. Problem solved.

Hope that works, it's the easiest thing to check and fix.

This is better than just visually checking your cartridge connections. Cartridges have been internally wired backwards in the past and I'm sure some will be wired backwards in the future.
dougdeacon
3,338 posts
 
Typo.

That should read, "...try reversing your speaker or
power amp + and - connections..."
odourboy OP
4 posts
 
Thanks all fo your ideas. I'm at least glad to hear that it's fair and reasonable to use a CD as a reference against my vinyl and the assumption that the vinyl should sound at least as good - and probably better if I'm set up properly. I can tell you so far what it is NOT. I've tried a couple of the easy ones:
1) The wiring sure looks right and I even buzzed it out with an ohm meter from the cartidge to the RCA conncetor.
2)Reversing the polarity of one side of the system did not help.
3) I was really hoping that the stylus was not seated properly, but alas, I removed it and reinserted it and engaged in a very satisfying manner, but did not solve the problem.

Still many things to check. I'll report back if/when I get this thing licked.

Cheers, Brian
odourboy OP
4 posts
 
Here's an update... It would appear that there are a couple if things going on: First, the cantiliver on my cartridge looks like it's bent a bit. This makes alignment kind of tough. (Gawd knows what it's doing sonically!) But I think I've got cartridge installation fairly close which has allowed me to uncover what I think is the real culprit. I was hasty in believing that my new Audio Experience Concerto Tube Phono Preamp was working well. It would appear that it's not. With my CJ FET phono preamp, my vinyl is now 'almost' indistingushable from a CD. With the tube preamp - the highs are still audibly attenuated which of course makes evaluating the sound field difficult. Bass seems to be pretty good now, so the cartridge alignment was initially contributing to the problem.

I suspect the Shure cartidge is not operating up to snuff so I probably got screwed buying used (through Audiogon no less!). But I'm pretty sure the tube preamp has some serious problems. It uses 12AX7s and I've tried new tubes including Electro Harmonix, EI, 9th gen. Chinese as well as NOS Matsushita - none of these signficantly 'take the blanket off' the tone. I'll be contacting the manufacturer regarding this issue once I'm absolutely sure it's the problem but if anyone has any experience with these Audio Experience Concerto preamps, I'd like to hear your comments.

... Brian
marakanetz's avatar
marakanetz
5,473 posts
 
Brian,
Check load resistance on your tube phono pre.
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