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Putting a super light phono amp inside the tonearm?
Putting a super light phono amp inside the tonearm?
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Old 27th April 2019, 08:35 PM   #141
Mark Tillotson is offline Mark Tillotson
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0.5nV/sqrt(Hz) is the noise voltage of 15 ohms, so will be noticable on many MC sources. Yes surface noise may be louder, but Johnson noise hiss when the needle is up isn't great either, as it only has to compete with the background noise of the room. It can be very noticable when switching sources for instance, and during quiet sections. And given the wide range of MC impedances it makes sense to have as low a voltage noise as possible to be fair to them all?
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Old 27th April 2019, 08:44 PM   #142
dreamth is offline dreamth  Romania
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I think that Thorsten suggested at some point the ise of opa1632 in open loop for such applications, wouldn't it be wiser to make the gain lower for just a buffer?Its input noise sounds very appealing.

Last edited by dreamth; 27th April 2019 at 08:54 PM.
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Old 27th April 2019, 09:14 PM   #143
scott wurcer is online now scott wurcer  United States
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Quote:
Originally Posted by Mark Tillotson View Post
And given the wide range of MC impedances it makes sense to have as low a voltage noise as possible to be fair to them all?
Not in my experience, John Curl has made a living off of his 0.4nV pre-amp. I've never had a setup where you could hear anything with the volume set at a comfortable listening level and the stylus lifted. The noise thing sometimes gets down to the mine is better than yours contest, there are always the IRF FET's that do <0.2nV running at absurd drain currents, there are also at least two 32 parallel BF862 pre-amps out there that do <0.3nV
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Old 27th April 2019, 09:24 PM   #144
billshurv is offline billshurv  United Kingdom
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Putting a super light phono amp inside the tonearm?
Yup, noise figure drag racing for willy waving rights is rife. In the same way that some on here build low ppm power amps and then try and get lower for the intellectual challenge I approve of it even though logically its really not necessary*.


*and I am just as guilty as others on occasion of chasing these dreams for the hell of it.
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Old 28th April 2019, 07:04 PM   #145
rayfutrell is offline rayfutrell  United States
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"You can't easily do the "in the headshell " buffer with a bi-polar."
Why Not? In the 1970s I looked into putting two 2N4250 emitter followers into the head shell of my tonearm. That would require two more wires for +- 15 volt power which was doable. I was going to use direct coupling because I figured that running the emitter followers at 100 micro Amps wouldn't put much current thru the cartridge. I even designed a little PC board but never got around to trying the idea.
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Old 28th April 2019, 07:29 PM   #146
scott wurcer is online now scott wurcer  United States
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Originally Posted by rayfutrell View Post
That would require two more wires for +- 15 volt power which was doable.
Yes, even wiring a tonearm for differential operation is a show stopper for many people. Just talking in the context of using what is there without mod.
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