2. analog
  3. 132371-104901

input impedance load on a cartridge.

I am interested in purchasing an MC cartridge that prefers a 400ohm "load"from the pre amp. My head amp for MC cartridges provides 110ohms which is the highest recommendation for the unit (according to the manual). In theory I should be able to change the resistors to alter the load but I am worried that going beyond the recommended value would harm the pre amp/head amp.

Can I alter the resistors to accommodate the cartridge or should I be looking for a different cartridge (or a different head amp)?

I am particularly interested in the possibility of changing the load. The alternative cart/pre option is of secondary interest.


oharchie

Showing 1 response by lewm

lewm
13,476 posts
 
I have found that 47K is optimal with LOMCs, using my Atma-sphere MP1, of course. The sound seems a bit more open and extended, compared to using loads of 1000 ohms or 100 ohms.  (I have set my MP1 up so I can quickly switch among 47K, 1K, and 100R load resistances, which makes it easy to compare.)  However, even 100R does sound fine, just a bit more closed in.  LOMC cartridges I've tried:  Ortofon MC7500, Ortofon MC2000, Koetsu Urushi, ZYX UNIverse.

The 47K load is kind of an antithesis of "current-drive", for LOMCs.
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