I previously posted problem with my B&O RX-2 MMC4 combo. I just got my Dual 1237 fresh from servicing - new audio connects, and cheap AT cartridge. I set up the TT and plugged it in. Sounds batter than the RX-2 but still doesn't have that "punch." I know a better cartridge will help but wanted to ask for suggestions on what else to check. I still have to turn the volume way up - about 12 o'clock for decent sound level. It sounds OK but nothing like the excellent sound I'm getting on FM out of this receiver.

I don't have a ground wire going to my Pioneer SX-950 receiver and will hookd one up tomorrow. Someone previously suggested making sure someone hasn't previously swithced my phono inputs to line level. How can I check this?

Thanks,

Shacky :)

I seriously doubt that anyone would go to the trouble of changing the phono inputs to line level on your receiver. If the phono inputs WERE changed, than your tt should sound virtually the same thru the tape or aux inputs as the phono inputs. The phono inputs use the receivers phono pre-amplifier and RIAA equalization circuit. If you're curious how your tt sounds thru a line level input hook it up to the tape or aux inputs.

Cartridges typically need 40 hours or so of playing time for the suspension to "break in" and allow the unit to perform at its best. If it's brand new and you don't have much time on it yet, things might get better. Also, there's nothing wrong with listening to your system with the volume pot set to a 12:00 position. However, if the sound doesn't improve to your satisfaction, or if the lower output bothers you, you might try a higher output model from a different company. Some models and brands are just a better match for some tables and systems than others. The Shure M44-7 has a 9.5 mV output and a different tonal balance than the typical AT house sound (and most low-end AT's have a 3.5 mV output). Many years ago I bought an M44, along with a 78 stylus for it, for use on a Dual (sorry, can't remember the model). I also tried it on my LP12. The Shure sounded lackluster on the Linn (I've never been impressed by any Shure on my Linn) but was quite lively and dynamic on the Dual.

Does the SX-950 have any adjustments for MM phono cartridge load (capacitance and/or resistance)? Some of the higher-end receivers of the 1970's did, and a mismatch could, of course, affect the frequency response (RIAA curve fidelity) and thus the sound quality, pretty significantly.

As to how high the knob has to be turned, it really depends on the cartridge output and the gain of the preamp. I wouldn't be concerned about the fact that you have to turn it higher (which really just means "attenuate the preamp less") for the MM phono then, say, the FM or an AUX (e.g., CDP) line-level input. I would only be concerned if you cannot get reasonable volume from the phono section with the volume knob turned all the way up.

Were I you, I'd also try to find another receiver to try with either of your tt's. Swapping is generally the easiest method of first-line troubleshooting. You swapped tt's/carts, now it's time to swap phono sections.

A final thought. Does the SX-950 have two phono inputs? If so, you might want to just try swapping THERE. Sometimes a dirty function selector switch can impact what you hear pretty dramatically. I had this problem with my Mac C-28 preamp.
http://audiokarma.org/forums/showthread.php?t=15850&highlight=c-28

Thanks for all the feedback. I do have 2 phono inputs and will try the second. Also, I attatched ground wire from receiver to wall socket and sound improved a bit.

Shacky