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In Reply to: RE: Technics SP15 vs Linn LP12 posted by Ross on October 20, 2016 at 14:22:02
As an added bonus, you can update the LP12 or return it to working condition if anything breaks. The SP15 has three ICs that are simply unobtainium. Not so the SP25 which is basically the motor from a 1200.
Follow Ups:
First, I don't know exactly what three ICs you're referring to. So far as I know, at least for the SP10 Mk2 and Mk3, there is one irreplaceable IC which I am too lazy to look up but which goes by part #MNXXX (where the Xs represent a numerical designation). The functions of this IC can now be replaced by a tiny PCB containing discrete SMDs, the same size as the NOS IC, that has been developed by JP Jones in NYC. Furthermore, JP's creation works a bit better than the original IC to control platter speed, based on measurements (not listening tests only). The cost of the IC and its installation by JP is only a few hundred dollars, which makes lots of sense if you own a Mk2 or Mk3. I don't know what's up with the SP25, but I would have thought it shares parts in common with the Mk2, at least. In fairness, the SP25 is a nice turntable but by no means does it represent Technics' best effort. If it's fundamentally like the Mk2 and Mk3 in regards to speed control, JPs PCB ought to be able to restore operation to SP25s (and SP15s) that have had a similar failure.
and they are unobtainium at this point, as I said. And yes JP Jones does make a replacement part, but at $155.00 each three of them will exceed the market price of the SP15 turntable not including the labor to install them. So in an SP10 MKii it may make more financial sense than in an SP15.
But lots of times we put more into a piece than the market value, and with a recap and the three boards one would have an SP15 that should give many years of trouble free service. At a price.
The SP25 is like the 1200 in speed control, no MN6042 chips. And no salsa either.
I bought one of JP's MN6042 replacement PCBs, but since my own Mk3 is working fine, I have been procrastinating on having JP install it. But why would the SP15 use three of them, whereas the Mk2 and MK3 use only one?
JP is a valuable asset for any DD turntable devotee. After 3 years of frustration and failure by a few reputable techs, he was able to find the problem in my Victor TT101 and fix it for good.
This is now off topic from the OP, but in case anyone else is interested, look into this.
From all I've read on the SP series (I own a 10 Mk2A and a 15), they both have ICs which are no longer in production. So if one fails you'll need to find a donor table or a substitute part such as Lew identified. All the more reason to replace those old electrolytic caps before one causes a failure and takes out an IC.
The SP25 on the other hand was based on the SP1200 series and so includes basically the same parts. The difference here was Technics offering an armless version so customers could choose their own.
A good Technics tech should be able to verify this.
"The piano ain't got no wrong notes." Thelonious Monk
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