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In Reply to: See dB and Cart Matching Formulae Here posted by JRags on September 12, 2006 at 10:21:23:
FWIW, I have always heard that it usually takes 55db or higher to run LOMC. That was the general wisdom a few yrs back. Maybe the chart says different. I don't know. But then too, I am assuming that his phono preamp is not set up for 100 ohm loading either, since its low output seems to match MM rather than the typical MC cartridge. Thus my recommendation of a tranny
I only use my gun whenever kindness fails
Follow Ups:
I thought low output was .23 or .25.CJ says that the preamp will work with .5mv carts, but, again, I don't really understand how loading factors into this (yes, I've reviewed the archives, and don't understand it any better).
The next question arises about the loading. Does your preamp have switchable loading? IOW's is there a switch near the phono input marked MC-MM. If so, you can probably use the cartridges if you switch it to the MC setting.(MC = moving coil which usually has a loading of 100 ohms vs moving magnet which loads at 47k ohms.) However you may need to turn up the volume quite a lot more than normal, because you are right on the cusp of needing more gain. If you have the MC switch, one of the cartridges you mentioned might be worth a try. if you find you don't have enough gain, then you can get the tranny. K&K makes a pretty good one for the $$$. They are a sponsor here also. The cost is about $200 assembled. Hope this helps
I only use my gun whenever kindness fails
I didn't know that a good step up would be that low in cost. Sounds like I can go for one of the .6 ones (which CJ tells me will work with my PV10) and if not, get a step up.The weird thing with my loading is that it says "100-47k" which means basically everything.
I'm not worried about turning up the volume (right now I have the opposite problem: very little volume control), and I think my cart is overloading the rest of the system.
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