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Simplistic NJFET RIAA
Simplistic NJFET RIAA
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Old 15th April 2019, 09:55 PM   #17461
Salas is offline Salas  Greece
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Simplistic NJFET RIAA
Quote:
Originally Posted by Hikari1 View Post
Many people seem to prefer transformers. Can good Cinemag, Lundahl, etc. really be that much better than these Shure transformers?

Anyways, JFET mc pre will stay for now. I will concentrate my efforts on power supply and maybe try the Hiraga BJT mc pre for comparison.
There are differences. Not tragic but palpable. Best I had tried is Sowter*. Symmetrical impedance SUTs are very good for balanced signal transfer from a naturally floating transducer. Like the MC cart is. Not cheap. When connecting SE, and if a diyer, some high quality active pre pre is a good bet. *Chipomatic balanced input RIAA

P.S. Be careful to always check for zero or near zero input DC offset on both channels before connecting the TT when trying BJT pre pre circuits. Also see that they stay trimmed with ambient temperature changes. Accidents during development if DC input coupled can kill a cart. Forget the JFET input safety mindset.
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Old 23rd April 2019, 05:23 PM   #17462
exw9 is offline exw9  United States
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Quote:
Originally Posted by Salas View Post
It has two practical advantages over the Denon. Higher output and a replaceable stylus. High output is good on high sens speakers. Not to crank the phono gain or the vol pot and bring up the system's noise floor. In general the DL-110 is velvety, the MP-150 is heftier sounding and more resolving.
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Thanks for the recommendations. Just as an update, I was feeling fancy and bought the Nagaoka MP-200. It is very impressive and I have really been enjoying it. One thing that is disappointing is when some of my records (mostly the newer ones) have bad mastering jobs. It is a shame they couldn't do a better job and make the record sound better than the digital files. I remember when I set up my subwoofer for the first time and discovered what songs handled bass well and which didn't. This is kind of similar with quality of the media, getting to find out which records are high quality and which are not.
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Old 24th April 2019, 01:17 PM   #17463
Salas is offline Salas  Greece
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Congrats. Nice purchase. That's a better cart due to boron cantilever mainly. Thus more revealing. All cuts ain't the same indeed. Some master the vinyl differently some try to follow the digital master, which does not suit the vinyl so well.
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Old 3rd May 2019, 09:24 PM   #17464
Hikari1 is offline Hikari1  United States
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I have been experimenting with this step-up...which has turned out well. Mine is built on perfboard with PRP resistors, Nichicon KZ and a Mundorf Supreme output cap. So far, I prefer it to transformers, although I haven't tried big $$$ transformers.

This circuit is very sensitive to power supply quality. I have tried LM317, LM317 with adjustment cap and a variety of batteries.

LM317 with an external transformer (12VAC wall wart) is not so good. It's OK, but noise is an issue and it lacks some sparkle. Probably still better sounding than my mic transformers, but noisier.

LM317 with adjustment cap is better. Got some sparkle back. Still noisy. Not terrible, but not as good as batteries.

Set of 6 AA batteries sounds good. Less noise, more elastic sounding. Carbon batteries not as good as alkaline.

2 sets of 6 AA batteries (dual mono) sounds really excellent. Especially if the batteries are alkaline. Really liquid sounding, least amount of noise.

2 sets of 6AA Batteries (dual mono) followed by a pair of 33,000uf caps (like Hiraga would use)....this is really nice. Best of everything. Power, control, blackness and very liquid. Sounds very rich and free.

Hiraga must have known what he was doing. And this is a very nice circuit if you are willing to experiment.
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Old 3rd May 2019, 10:52 PM   #17465
Salas is offline Salas  Greece
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Did you include the C1 R3 R4 Q4 C2 Cmult part shown in the schematic after the LM317 when testing with it?
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Old 3rd May 2019, 11:44 PM   #17466
Hikari1 is offline Hikari1  United States
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Yes. And cap multiplier after batteries as well. I did not try 7809 because I don't have any.

Linear PSU was 12V AC wall wart, MUR160, 10K UF Nichicon KG, LM317. Single mono.

In general, I hate batteries. I've used the nfet mm phono with batteries. Salas shunt was clearly better. But in this case I will make an exception.
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Old 4th May 2019, 01:02 AM   #17467
Salas is offline Salas  Greece
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The BC550C in the Cmult part can be replaced with a BC337-40 which has lower 1/f noise. The 317 can be substituted with something quieter like an LT1965. When staying through hole that is.
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Old 4th May 2019, 01:28 AM   #17468
Hikari1 is offline Hikari1  United States
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I have read tests where batteries are compared to linear psu. Noise in batteries increases greatly as current draw increases. Perhaps that’s why batteries perform well in this situation. In other circuits I have not preferred batteries.

Also, I want to be clear that this circuit, regardless of power supply is good and I prefer it to transformers. But Iam crazy and always have a soldering iron ready for experimenting.

Last edited by Hikari1; 4th May 2019 at 01:30 AM.
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Old 4th May 2019, 01:31 AM   #17469
Salas is offline Salas  Greece
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Its a sensitive zero PSRR very low signal point. That asks for little current and it can use the lowest noise rail it gets. Batteries are not associated with the mains EMI too. When you want to extract all its potential, PSU perfectionism as well as shielding, matters.
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Old 4th May 2019, 02:35 AM   #17470
Hikari1 is offline Hikari1  United States
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Yes, and my environment is not best place for phono stages with a big class a amp and huge torroid transformer less than a meter away. Grounding also matters greatly in this circuit, and Iam using a rega which complicates things. I have tried a few grounding schemes but it seems to work best bringing all grounds to the rca jack the rega uses for ground. Regas have no separate ground wire.

But, as usual, all Salas circuits sound good. This is more tweaking and testing for my own personal environment and situation than anything.
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