I have better things to do, I would gladly listen if someone else did the work. The problem is getting the other side to participate on equal ground. Jan managed at the triode fest in Europe, too much time and money for me to invest just for this. The 8-legs won (though valves have 8 legs too, sometimes).
Anything.
The 2134 is really low noise so it has that going for it in a phono preamp, but it's also boring. I've stuck the LME49720HA in place of them in a phono stage before. Yes the noise is worse. But my music wasn't dead sounding, so I could enjoy it.
I did it the same way after that 47Labs said that, soldered the feedback resistor directly on the chip legs. That was a long time ago.
E.g. something like this? Calvin-phono/PlatINA/RP1 - calvins-audio-pages
This comes from our own "Calvin" on this site. Pretty sharp guy.
MC-only given the bias current, but not a terrible method, especially for a large flat gain. It's not too hard to get way below the inherent limitations of vinyl. If it suits you, go for it! There's a ton of different implementations that could be used.
This comes from our own "Calvin" on this site. Pretty sharp guy.
MC-only given the bias current, but not a terrible method, especially for a large flat gain. It's not too hard to get way below the inherent limitations of vinyl. If it suits you, go for it! There's a ton of different implementations that could be used.
The SSM2019 delivers some of the finest vinyl-produced playback experiences. Whether retrieving the instrumental virtuosity, rich tone, and studio ambience, the SSM2019 reproduces music with fine transparency, note extension, and tone, and shone at micro- and macrodynamics.
The INA163 brings out humanity and depth of feeling and timbral naturalness from every recording — it is a joyful communicator. The INA163 almost entirely removes itself from the music to let it speak. What unique sonic characteristics it did have were of warmth, a grain-free treble, and a certain delicacy, all of which complemented its whole-cloth sense of openness and coherency. The INA163 knows how to work the room, charming every listener and LP in earshot.
They parallel and add quite nicely, only good for MC but not bad for some MI like Grado. Both designers are friends of mine, though I don't see them often. The AD8229 works too (there is a low cost version of the same die), designer is also a friend.
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And that can at least be simulated and measured. The various threads on LM3886 PTP vs PCB are a good introduction to some of the pitfalls you can get in layout.
@Waly: you owe me a new keyboard!
Captured it all. I used to work the room with the first Young Gods LP though I confess I was well past 18.
I don't want 2000 of them. I'm just cheap. Hosing folks for $35 for a 47nF 10% cap, good work if you can get it.
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Saw them last year before Christmas in Koln @Palladium, opening for the New Model Army. As fresh as expected, with a special focus on the micro- and macrodynamics. Somebody bootlegged the show YouTube too bad quality is crap.
I'm set for now with my PS cap RIAA, sounds nice 0.1dB out of the box not that that really matters.
Mouser has BFC241614703 2% $1.73 for the 47 nF. These are quite nice and available. The 1837MKP .1 1% is also good but hard to get with current lead times. The Reliable are maybe a bit better but are $7.00 in quantity.
Quoting over 10 piece prices for DIY is misleading, I insist on respecting the means of the average person working in their garage/basement.
The OPA2134 is a decent part but the OP needs class A bias, as you have done. This makes a significant difference. There are better parts available now from TI and one in particular has specifically very low CM distortion due to IP cap modulation however I can't remember which one it is. Check data sheets of their later OPA's.
T
any and all PS dielectrics have been increasing in cost as the film sources close. Only one really good manufacture of PS left. I mean really good (no pin holes and other weirdness ) in thin film. REL uses them as only source now.
REL is mfr and not a distributor or wholesaler (unless to equipment mfr). They do not stock inventory but build to order.
Get your quality PS type before cost are too high and vol too low and then no more PS. That circus act in Washington DC wont help imported material costs either.
thx-RNMarsh
REL is mfr and not a distributor or wholesaler (unless to equipment mfr). They do not stock inventory but build to order.
Get your quality PS type before cost are too high and vol too low and then no more PS. That circus act in Washington DC wont help imported material costs either.
thx-RNMarsh
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2017 technology wizardry in action: a prototype microwave down converter. 6GHz digital synthesizis LO with -135dBc/Hz phase noise @1MHz, a LO gain stage to bring the signal at +11dBm for the mixer, switched 8GHz input, passive double balanced mixer, 5 pole 2GHz Chebyshev LPF, 2 stages of gain for a +20dBm 10MHz...2GHz output, output power zero bias schottky diode detector. All RF PCB traces are CPW. Microcontroller controlling the synthesizer over SPI. Triple switching mode power supply followed by low noise LDO regulators for +3.3V, +5V, +10V. The whole thing uses 5W of power, not bad at all.
Now waiting for the enclosure (2.65"x2.375") milled from a solid billet of aerospace grade aluminum, of course (trivial 6061 aluminum would definitely destroy the sound). Unfortunately, parts (smallest SMD is 0201) were not cryo treated and blessed by Tibetan Monks before hand soldering. But the result still sounds great. The sound stage and the sounds of the musicians' instruments are not being re-created. Rather, they are being revealed, as if the instruments are melting away some opaque, impermeable substance that otherwise encases and obscures the sound.
Meantime, in a country far, far away, some are still fighting the 741 slew rate limitation as observed 50 years ago.
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