Ask your circuit designer to run a SPICE simulation of the Pearl 3 with wildly unmatched 2SK3557 devices. Have her simulate it twice; first with R4-R7 = 10 ohms as in the official Pearl3 design; then a second time, with R4-R7 = 0 ohms (short circuit). What is the effect of wildly unmatched 2SK3557 devices with, and without R4-R7?
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Passive HF eq. and active bass boost in the second stage combined with low supply +/_15volts voltage gives not so good overload margin in this phono stage. This RIAA topology is a popular approach of many american designers. All in one fully active topology is better for op amp based phono preamps. See Doug Self books.
My Borbely 419 and John Curl Vendetta clone which I built have the same RIAA topology , but they are based on discrete components with +/-24V power supply voltage. John Atkinson in Stereophile measured 32db overload for Vendetta phono for 0.5mv input. Op amp phono preamps have much lower overload margin.
Reproduction with Vendetta have subdued ticks and pops on LP records and sharper transients compared to lower overload ones.
Borbely 419 is very close to Vendetta.
Parasound JC 3 has the same topology but +/-15 supply voltage.
My Borbely 419 and John Curl Vendetta clone which I built have the same RIAA topology , but they are based on discrete components with +/-24V power supply voltage. John Atkinson in Stereophile measured 32db overload for Vendetta phono for 0.5mv input. Op amp phono preamps have much lower overload margin.
Reproduction with Vendetta have subdued ticks and pops on LP records and sharper transients compared to lower overload ones.
Borbely 419 is very close to Vendetta.
Parasound JC 3 has the same topology but +/-15 supply voltage.
The spec is + - .1 max on the XS but typically better. This Pearl 3 I used 1% Dale RN55 and 2% caps measured to .1% because I could. I guess you could call it + - .05 dB. If you use the parts straight out of the bag with no matching even on the fets I doubt you would see much difference. But being diy you might as well chrome it or gold plate it like the boards that are coming will be.
When I was child I had this model with various Ortofon cartridges (brand is Delphon which is "long gone"):
In fact I have a TT......a Lenco L78 but it is not running (it needs CLA and probably some new rubber parts) and I think I will need something better. I have looked at various models
A HiFi shop has this on sale:
https://www.ortofon.com/ortofon-century-tt-p-890
But maybe too "retro" ......and hard to find reviews......but it will look good even if I don't use it .......
Do you think it will play nice with a P3?
In fact I have a TT......a Lenco L78 but it is not running (it needs CLA and probably some new rubber parts) and I think I will need something better. I have looked at various models
A HiFi shop has this on sale:
https://www.ortofon.com/ortofon-century-tt-p-890
But maybe too "retro"
......and hard to find reviews......but it will look good even if I don't use it .......Do you think it will play nice with a P3?
First of all, you must get a tonearm with NO kinks... it must be straight.
Second, the turntable must be belt drive with a World Klass Bearing with a bunch of upgrades with inKomprehemsible names understood only by people who drink Scotch Whiskey for lunch.
Third you must get a wet LP washing machine ( vacuum is very good.. )...
Lastly, you must buy it used and upgrade it as you go along. Anything else is not DIY. NOTE: I'd not recommend buying the washing machine used though.
Otherwise, the Pearl 3 will be wasted, you'll be hearing the noise from the gunk on the grooves, the noise of the bearing and the electrons on the tonearm will be chocked by the turn.
https://www.hifishark.com/search?q=linn+lp12+lingo
Surprisingly, the cartridge, within reason, is not as important as getting the noise level down on the turntable and phono preamp. Get those done first... and then go spend a kilobuck on the cartridge.
Second, the turntable must be belt drive with a World Klass Bearing with a bunch of upgrades with inKomprehemsible names understood only by people who drink Scotch Whiskey for lunch.
Third you must get a wet LP washing machine ( vacuum is very good.. )...
Lastly, you must buy it used and upgrade it as you go along. Anything else is not DIY. NOTE: I'd not recommend buying the washing machine used though.
Otherwise, the Pearl 3 will be wasted, you'll be hearing the noise from the gunk on the grooves, the noise of the bearing and the electrons on the tonearm will be chocked by the turn.
https://www.hifishark.com/search?q=linn+lp12+lingo
Surprisingly, the cartridge, within reason, is not as important as getting the noise level down on the turntable and phono preamp. Get those done first... and then go spend a kilobuck on the cartridge.
Lenco L78 is an excellent turntable which deserves to be fixed up. It's easy to work on. The V-blocks in the bearing of the arm probably needs replacing. CLA of the motor is a good idea. Lots of good information on lencoheaven.net.In fact I have a TT......a Lenco L78 but it is not running (it needs CLA and probably some new rubber parts) and I think I will need something better. I have looked at various models
I use a L78 myself. Very happy with it.
Maybe I can get TG to do the DIY-job like this:
http://www.troelsgravesen.dk/LencoL78.htm
He has done it a number of times with L75 and L78.
He sold them afterwards and I was close to get one but at that time I was not sure about a TT......and after thinking.....they were gone.
I think price was about USD 1000 which is ok with all the work done to it. It was without an arm but with tone arm boards......from memory.
Yes, I have read about "LencoHeaven"
There is a similar for Thorens TD124......
http://www.troelsgravesen.dk/LencoL78.htm
He has done it a number of times with L75 and L78.
He sold them afterwards and I was close to get one but at that time I was not sure about a TT......and after thinking.....they were gone.
I think price was about USD 1000 which is ok with all the work done to it. It was without an arm but with tone arm boards......from memory.
Yes, I have read about "LencoHeaven"
There is a similar for Thorens TD124......