Dedicated phono-pre for MM only?


Hi All,
the subject of phono-pres, specifically 'adapted' to MM came up in some related postings.

IF, and only if, MMs are much to ones liking --- why spend your buck on some 'halve backed' 60dB plus, MC gain requirement, stage? Why not consider put the $$$ into a TOP 40dB gain stage of either SS or tube?

Raul had more thoughs on the subject as he mentioned before, and might share, why he knows that a TOP MM compared to MC stage circuit requirement might NOT be -one suit fits all-.

There could even be a nice argument to fit a tube gain stage only into an otherwise SS only system!?

Again, the $buck saved on the 20dB plus circuitry could be translated into the BEST circuit for an MM.
I realise, that most such stages were simply fitted inside some older TOP pre-amps, (e.g. Jadis...).
I have not come across a **dedicated** , current 40dB stage neither in nor outside a pre-amp.

Thank you,
Axel
axelwahl

Showing 1 response by halcro

Hi Kirkus,
because the side-effect of the twisting is an increase in cable capacitance, which is exactly what we DON'T want for our MM cartridge.
This is fascinating for me right at this moment due to the fact that I have just mounted a Garrott P77 MM cartridge to my Continuum Copperhead arm which has balanced input terminations into the Halcro DM10 preamp. The tonearm wiring is fine gold (or copper) uninsulated Litz type wiring (I think), which is very tightly wound together to reject the noise (hum) to which you refer. This seemed to work for LOMC cartridges such as the DV1s and Universe (which only produced a slight hum when the volume was turned up considerably), but fails miserably with the MM which produces an incessant hum at any volume.
The question has been asked of Mark Doehmann if he has listened to any MM cartridges through the Cobra and Copperhead arms as none of the dealers believe anyone has actually mounted a modest MM in such exotic and expensive arms?
We are still awaiting the answers but your statements are intriguing indeed.
What do you venture, would be a solution to this problem?
Regards
Halcro