cc_s425@ux.kingston.ac.uk (Syngen Brown) (10/03/90)
Someone on this list/mailgroup recently mentioned that there was a new upgrade for the LP12. This is the LINGO, an optional replacement for the Valhalla motor controller. The following is lifted directly from Linn's specification release. "At the heart of the Lingo are two very low noise crystal oscillators derived from the Linn Numerik digital studio recording system - one for 33.33rpm and one for 45rpm. The switch on the turntable selects the appropriate oscillator, whose output is fed into a synchronous counter to produce a 50Hz or 67.5Hz square wave for 33rpm and 45rpm respectively. As the LP12 motor runs quietest when driven with a clean sinusoidal waveform a precision filter is employed in the Lingo to remove harmonics from the square wave leaving only a pure sinusoid. The most uniform torque is delivered from the motor when both phases are driven at 90 degrees with respect to one another. This is achieved by a ninety degree phase-shift network after the filter. The two resulting sinusoids adrive two high voltage class A amplifiers, the outputs of which drive the two motor windings. The Lingo uses 'stall detection' circuitry to feed the motor with a higher voltage for increased start-up torque. When the platter reaches the selected speed this load-sensing circuitry reduces the power output. From then on the motor just maintains the platter's own intertia to keep it going silently. A toroidal transformer on the PCB, and a mains filter, give a very high degree of electrical isolation from the mains voltage supply." The Lingo is housed in a seperate 326x157x75mm enclosure and is available complete with LP12 or as an upgrade kit. The Valhalla board is replaced by a smaller PCB which serves to connect the motor and switch to the Lingo, via a multiway cable. The existing (110v) motor is used and the switch replaced by a dual LED version for speed changing as per the Linn Axis. UK prices are quoted at 470 pounds for the Lingo Power Supply and 26 pounds for the connection kit. A complete LP12/Lingo is priced at 1068 pounds. -Syngen
brian@comp.vuw.ac.nz (Brian Boutel) (10/05/90)
In article <6739@uwm.edu>, cc_s425@ux.kingston.ac.uk (Syngen Brown) writes: |> |> Someone on this list/mailgroup recently mentioned that there was a new |> upgrade for the LP12. This is the LINGO, an optional replacement for |> the Valhalla motor controller. The LINGO was demonstrated to me at my usual dealer's a few days ago. I don't know how the NZ agent had got it so quickly, but the bottom of the box had S/N 1 scratched into the black surface. We compared two lp12s with ekos. One had the lingo and asaka, the other the normal valhalla and troika. This was played through a LK280 + SPARK power supply and both helix and epos speakers. Overall impression was that the lingo + asaka was a bit smoother than the troika. Perhaps the detail came through a little more clearly but was less etched. I was not convinced that I should upgrade to the lingo as soon as supplies become available (November?), but it would be, depending on your local price structure, probably cheaper than the cartridge upgrade. One piece of gossip from the importer was that of about 100,000 lp12s out there, Linn expected between 40 and 60% to upgrade to the lingo. --brian -- Internet: brian@comp.vuw.ac.nz Postal: Brian Boutel, Computer Science Dept, Victoria University of Wellington, PO Box 600, Wellington, New Zealand Phone: +64 4 721000