Tube phono stage, or solid state,pre amp


Hello Friends1. Well Tempered Reference, TT, with Zu cartridge,
2,I have a "PS Audio GPH, phono stage" solid state, although I would like a few more options re cartridge loading??3  My Pre Amp is "PS Audio Pre/Dac pre amp!!",solid state!!
4. "Audio Labs" solid state mono blocks, with sounds smooth and power full !!5. Pair of Zu Souls MK!!, speakers!!I'm close to nirvana, but am missing something!!, can someone help??The sound is on most records, just, seems on the bright side, which is great, for cymbals, and dynamics, with nice bottom end??, but there is trend, for male vocals, and lead guitar, that up sets the balance??, towards the bright!!
I need someones advice??1. shalll I go for, a different, Tube Phono Stage??, mine has nice bass!!2. Should I replace the pre/dac, pre amp??, for a tube unit, Mine it is solid state??Friends, what is your thoughts??Many ThanksDavidAustralia

128x128daveyonthecoast
Thanks AllTube, phono stage, or tube preampI still want my kick ass bass, but a little smooth, at the high references??Tube Phono Stage, or Tube, pre amp ??Please help!!
2. PS Audio GHPG phono stage, loading jumps from 100- to 400 ohms, and the Zu likes around 300ohms??, Ive tried 100ohms, but seem's a bit muted and boring, when I go to 400ohms, the bass comes alive, but with harshness,!!
The loading is there for the preamp, not the cartridge.
This is how it works: The cartridge is an inductance (the 'coil' part of 'moving coil'). The tone arm cable is a capacitance.
Together they form a resonant circuit. Quite often the resonance is several MHz, but it could be in the high 100KHz range too, depending on the coil inductance and the cable capacitance.
Usually loading is thought to reduce ringing in the inductor, but with LOMC cartridge, this does not happen until well outside the audio band. The reason that an unloaded cartridge can sound aggressive on some preamps is that the resonant peak is injecting RFI (Radio Frequency Interference) into the preamp. If the preamp isn't happy with that, it can sound quite aggressive! The loading resistor detunes the resonant peak, thus getting rid of the brightness by removing the RFI.
The problem is, now you are forcing the cartridge to do more work because the loading resistor is a much lower resistance. This can cause the cantilever to get stiffer, much like how shorting a loudspeaker can stiffen its cone.
Now if the preamp is designed such that it does not care about the RFI, then no loading is needed. A side benefit of this is that quite often there are less ticks and pops in the playback as well. We can discuss why later.
So the loading is there for the preamp, not the cartridge.

My previous post was deleted for some reason- it put all this in a nutshell. I've not been able to sort out why it was deleted.

BTW there is a great thread on the What's Best Forum regarding this topic. I don't recall the thread title, but it was about cartridge loading. Jonathan Carr of Lyra fame participated and essentially stated what I've stated above. Additionally, take a look a Jim Hagerman's site: http://www.hagtech.com/loading.html
In this site you can see that the peak I mentioned is a good 30db higher than that of the cartridge. This is a significant amount of RFI and can play havoc with sensitive phono input circuitry unless the issue is anticipated by the designer! In far too many cases, it is not.
BTW, it is far easier to design a tube phono section that is RFI resistant, due to the fact that semiconductors have diodes integral to their operation. This diode can rectify (convert from RF to audio) the RFI, so more precautions have to be taken by the solid state designer to get around this problem. IOW, a good phono circuit is not just enough gain and proper equalization, it must also have good overload margin (to deal with that 30 db peak) and RFI resistance.



Thanks AllSorry to sound, bad, but we have missed the point??I have a PS GPH, I wish the cartridge loading would be better, the cartridge loading is 300 ohms, but the loading is 500 ohms, the bass is great, but the high octaves, on some recordings, while the bass is still great!!, still bleeds, on the high notes!!!It goes back to my problem, I want to keep bass and attack, but smooth the end, my pre amp is the PS Pre/DacWhat shall, I do, is the PS GPH giving me the bass, and the PS Pre, giving me the harsh nest, I read some where, that you should have a tube amp,in the middle of a SS phono stage, and a ss preamp, to calm things down, as I like bass and slam, should be the preamp??that needs replaced??
Your thoughtsRegardsDavid

Thanks Friend'sI think I might, had confused peoplejust a quick recapI have a PS Audio GHPH S/S, phono stage, and a PS Audio Pre AmpI love the deep bass I get, and slam, but at the same time, it gives me a harshness, on most recordings, some one told me I should insert a tube, Pre/ or tube phono stage, I'm led to believe, that the S/S phono stage, will still give me "balls", and slam, and replacing my Pre-Amp, with tubes, will give me the balance, I'm after, to smooth thing's??, with out removing cymballs, etc, but get rid of some male vocals,with nasal harshness, and screeching, guitar work from some great guitarist, I'm sure the sound tecks have done this on purist, to highlight there ability??, I maybe wrong, but I really want feedback, with a few suggestions??Many ThanksDavid SpryAust