Valhalla Power Supply - Linn LP12 Setup Manual

Revised Jan 1998

VALHALLA POWER SUPPLY

Introduced - 1982 Serial No. - 38,800
The Valhalla circuit board is designed to isolate the
rotation of the turntable motor from variations in the mains
supply. The circuit board operates by using a crystal
oscillator, dividing it down to 50 Hz, filtering it to form a
pure sinewave, then amplifying this signal to a level which
drives the motor.
The switch provides a trigger to the electronics, making
the motor start or stop. This involves power being on the
circuit board constantly, while it is connected to the
mains. The static power consumption is very low, but a
slight warmth may be felt on the baseboard.
The circuitry will have the longest life expectancy when
continuously connected to the mains. However, if de-
sired, it may be disconnected at night, for example,
without impairing reliability.
The Valhalla will drive almost all LP12 motors, with the
possible exception of very early motors (coded MB10).
It drives the motor with 85V A/C across the red phase. The
blue phase is driven through a phase shift capacitor at
approximately 75 V.
For fitting the Valhalla see separate document:
"LP12, Circuitry Kit Fitting Instructions".
Copyright © 1991-98 by Linn Products Limited. All Rights Reserved.
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