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Re: Serious listening session to Marantz 2330B.

Posted by Bold Eagle (A) on April 26, 2007 at 07:25:19

In Reply to: Serious listening session to Marantz 2330B. posted by HamBone77 on April 26, 2007 at 05:52:53:

You may have to re-do the De-oxit on the volume control.

As to the phono, the noise you're hearing is normal for an open circuit, and 12 o'clock on the volume control with the 2330 is really a lot of output. Most amps reach full output at 12 o'clock to 2 o'clock with inputs of normal level. The rest of the rotation is there for lower than normal inputs.

As to interconnects: For phono, you want to total capacitance of the tone arm wiring, the interconnects between the TT and amp, and the amplifier input capacitance to match your cartridge. AT's typically want less capacitance (around 250 pF) than the older Shure and Pickering models (450 pF) . There is typically a manufacturer's recommended total. So with the AT, use the shortest possible IC's and use ones that have low capacitance. Radio Shack Gold ($10.95) are fairly low. The Dual CS5000 arm wiring will be moderately low, and the Marantz will be ???. Sometimes you get lucky and the manufacturer specifies the input capacitance on their phono section. Measurement is always the best idea, but a clue to cable capacitance is the cable diameter. Bigger usually gives lower capacitance. Those skinny "el cheapo" IC's that get included with a lot of gear have really high capacitance. I have 0ne 3' pair that measures 330 pF, while a 3' long Radio Shack Gold is only 70 pF.

The optimum cartidge loading gives the flattest response. Too much rolls off the top end and causes a rise in the upper midrange, too little and a sag develops in the upper mids and a peak develops in the upper treble. If the total capacitance of the arm wiring, reasonable interconnects and amp input add up to too much for the AT, there is really nothing you can do about it and you may have to find a cartridge that has a higher capacitance requirement.

The pre out/main in jumpers need to be short. Sometimes, using interconnects instead of the original jumpers can raise the noise level as the IC's carry a ground between the pre out and main in and the amp may be engineered to not have the preamp and main amp grounds connected at that point. Personally, I have never found a case where the original jumpers sounded worse than IC's.

Trust me, your phono cart and Advents are broken in by now. At this point it's more a case of you "getting used to" the new sound.

Once you get the little bugs worked out it ought to be a really nice system.

Jerry

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