I have a Cary pre that requires a min. of 1.4mv so I use a dynavector 10/5 mc (piece of junk) that puts out 2.5mv so your combo should work. Antique Electronic Supply should be able to get you matching tubes. 480-820-5411 good luck
Will I need A moving coil set up device?
I am considering buying A Conrad johnson premier 3 preamp. Stereophile reviewed it using A moving coil device saying,(the premier three used with the HV-la has just enough gain so that you can use it with any moving coil cartage with A minimum of 2mv output.) I have A benz micro MC with 4mv output. I am also concerned with the asking price of $1250. and the availability of tubes.
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Stepup devices (transformers or head amps) are not usually used with 4mv cartridges, and if you were to use one you would have to choose it carefully to avoid the possibility of overloading it. Also, the Premier 3's 40db phono stage gain spec is very reasonable for a 4mv cartridge. Given that gain is a reasonable match to cartridge output, what determines the amount of hiss that you hear is not the amount of gain but the signal-to-noise (s/n) performance of the phono stage, whether it is internal to the preamp (as in this case), or external. The s/n spec of 72db ref. 10mv input that is given in the Stereophile review is meaningless, because "weighting" is not specified. But judging by the review comments re 2mv I suspect that the hiss levels you will hear might approach being objectionable, particularly if you are listening to wide dynamic range material such as a lot of classical music (in which case you would be setting the volume control much higher than for dynamically compressed material). That could probably be helped if you were able to obtain and substitute particularly low noise tubes in the preamp's phono stage. Alternatively, although it would involve significant expense, you could purchase an external phono stage that provides better signal-to-noise performance, and connect it into a line-level input. Re your last question, availability of the 12AX7, 5751, and 5965 is not a problem. The major online tube sellers should have all of them, at reasonable prices except perhaps for some of the most sought-after NOS versions. Regards, -- Al |
Important follow-up to my previous post: After looking more closely at the Stereophile review, I see that their statement about marginal noise performance with a 2mv cartridge was with a 28db head amp in place, ahead of the preamp. Given that, the review undoubtedly omitted a decimal point, and intended to refer to 0.2mv cartridges, not 2.0mv cartridges. And the noise performance was most likely reflective mainly of the head amp, not of the preamp. The Koetsu Black, which they referred to as providing marginal noise performance when fed straight into the Premier 3, is (and I believe was) a 0.6mv cartridge, according to the cartridge database at vinylengine.com. The low output Dynavector's and Accuphases's which Stereophile referred to as working unacceptably when fed straight into the Premier 3 had outputs in the rough ballpark of 0.2 or 0.3mv. So I suspect that you will be fine with a 4.0mv cartridge, if that is indeed what it is. Regards, -- Al |
Thanks for your feedback,especially Al for your research. I double checked the box my cartridge came in and it is A MC Gold and the output voltage is 0.4mv as Goldeneraguy suspected. I think Al was A little suspicious also. Unfortunately my error probability changes everything, sorry about that. I don't want to spend more money and put another component in the signal path. Based on my new information and what Ive read so far Im guessing Ill need A step up device. Ill also contact CJ and see what they say. This problem is new to me, do I have A user unfriendly cartridge that will be a problem with most preamps? Vinyl is my only source so I guess I have lot to learn. Thanks, Billy |
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