djb Posted July 19, 2013 Posted July 19, 2013 Tbe horse has bolted, I've just purchased a 1980s Logic TT external power supply on eBay from Canada About $100 delivered I own 2 LOGIC tts a dm101 and a tempo So I thought at the price it was worth the expense I was the only bidder!! Is this a sign? There are only about 5 mentions on all the web!! Is this a sign? To the real question . Are external TT power supplies of sny real value SQ wise if you have reliable local power supplies as I do in Melbourne?I know many lp12 owners reve about the "lingo"? But lp12 owners would! In the unlikely event I was to own one, one of the 5 references said this logic would work on an LP12. I won't ho,d my breathe but the 2 companies were vying for the same market! So, views?
Telecine Posted July 19, 2013 Posted July 19, 2013 (edited) Someone gave you bad advice on that buy ; ) Turntables from that era mostly use the same motors from Maxon, Prometic etc. What works on one turntable is likely to work on another. Sound quality is subjective but I think that a decent power supply can make an audible difference. Whether or not the Logic one does remains to be seen. They were of course relegated to obscurity by the superior Linn offerings ; ) Edited July 19, 2013 by Telecine
caddisgeek Posted July 19, 2013 Posted July 19, 2013 I have read that power supply upgrades can have significant improvement on SL1200's, but have no experience of it myself
djb Posted July 19, 2013 Author Posted July 19, 2013 You 3 miscreants have all read those job ads "previous applicants need not apply" This was/is a serious request
caddisgeek Posted July 19, 2013 Posted July 19, 2013 (edited) and I made a serious answer in regard to a serious TT Edited July 19, 2013 by caddisgeek 1
Warren M. Posted July 19, 2013 Posted July 19, 2013 (edited) Tbe horse has bolted, I've just purchased a 1980s Logic TT external power supply on eBay from Canada About $100 delivered I own 2 LOGIC tts a dm101 and a tempo So I thought at the price it was worth the expense I was the only bidder!! Is this a sign? There are only about 5 mentions on all the web!! Is this a sign? To the real question . Are external TT power supplies of sny real value SQ wise if you have reliable local power supplies as I do in Melbourne?I know many lp12 owners reve about the "lingo"? But lp12 owners would! In the unlikely event I was to own one, one of the 5 references said this logic would work on an LP12. I won't ho,d my breathe but the 2 companies were vying for the same market! So, views? The short answer to your final question is that power supplies can make an enormous difference to sound quality, in areas such as bass depth and detail, "speed", rhythm, general musical integrity, and, well the lot! But there is no particular reason to believe that Logic put a lot of thought into their power supply at the time. Linn was actually among the first to upgrade their power supply from a very primitive one to a pretty reasonable one, and then followed up with the much more expensive and very cleverly engineered Lingo. Sota in the US and some other manufacturers followed up with very smart alternative power supply topologies to drive AC motors. Most smart power supplies since then have been designed to drive DC motors, which are inherently less invasive than AC motors as they don't generate magnetic or electrical fields. However they are also unable to detect and adjust for their own speed fluctuations and are thus subject to long-term speed changes dependent on the AC voltage fluctuations from the mains. So a big part of smart power supply to DC motor-driven belt drives is some means of regulating the speed independently of the mains AC voltage. Origin Live built a handsome income replacing AC motors and power supplies by their DC alternatives, resulting in many improvements over even the best AC power supplies, but the problem of perfect speed management remained elusive in the DC world. Back to improvements in sound, when I had my LP12, going from a Linn power supply and AC motor to a Once Analog power supply and DC motor (not the latest power supply), the difference in bass resolution and impact was stunning. I was unable to hear any speed fluctuations at all (but I don't have perfect pitch). Linn again raised the bar a few years ago with its Radikal power supply and DC motor system, which self-regulates by means of a stroboscope built into the platter. Since then some more precise self-regulators have been built into turntables, for instance by TTW Audio. For those without excruciatingly perfect pitch, this additional step might be overkill. It is not necessarily critical that constant monitoring of the actual platter speed take place. There are clever electronic methods to maintain constant voltage in a DC world, once initial speeds are correctly set. The newest Once Analog power supply does this, effectively requiring no intervention after a single pair of strobe readings (33 and 45 rpm). The result is not just less need for occasional speed checks. There is significant improvement in sound quality across the board as a result of the upgraded power supply Hope that helps Cheers Warren Edited July 19, 2013 by Warren M.
Warren M. Posted July 19, 2013 Posted July 19, 2013 (edited) duplicated post - contents deleted Edited July 19, 2013 by Warren M.
djb Posted July 19, 2013 Author Posted July 19, 2013 Most helpful warren appreciate the effort Makes good sense and answers my questions
Newman Posted July 20, 2013 Posted July 20, 2013 To me, the power supply unit is the circuitry that gets the right voltages to the motor system (and to any other electrical systems on the deck). The motor unit is the motor and any circuitry that regulates its speed and output, including servo if used. Two separate things. Which is the Logic upgrade kit upgrading? I assumed it was just the power supply. No?
djb Posted July 20, 2013 Author Posted July 20, 2013 Very difficult to ascertain Won't know until I plug it in! The few comments suggest may do 4533 switching Canada has 120v IF it's 120v will I need to rewire for 240v ? Being British machine may be 240! 2 weeks delivery time from Canada?
Warren M. Posted July 20, 2013 Posted July 20, 2013 To me, the power supply unit is the circuitry that gets the right voltages to the motor system (and to any other electrical systems on the deck). The motor unit is the motor and any circuitry that regulates its speed and output, including servo if used. Two separate things. Which is the Logic upgrade kit upgrading? I assumed it was just the power supply. No? You just need to swap over from a Hercules or similar power supply on a Linn to a Lingo to realise how much difference a power supply can make on exactly the same motor. It is gigantic!
olderas Posted August 25, 2013 Posted August 25, 2013 I think it has made a big difference to my setup. If you look at the "Turntable Speed?" posts. The very first one is my Master Solution running directly off mains, and the next measurement about 5 or 6 down is the same turntable with the "Synchro" power supply. It is a AC motor, so go figure?
Recommended Posts