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Re: DIY Armageddon - Advice Needed Please

Posted by ar guy (A) on December 14, 2001 at 18:23:47

In Reply to: Re: DIY Armageddon - Advice Needed Please posted by kentaja@yahoo.com on December 14, 2001 at 12:58:44:

No, the phase shift circuit replaces the Valhalla board - go directly to the motor. The isolation transformer should benefit either one though. In the Linn FAQ they suggest the following modifications to the Valhalla for improved performance. From how I understand it works this goes against the whole concept but I've never tried
it to find out. I like the sound of the DIY Naim Armageddon supply better than the stock Valhalla anyway. However, if you lived in an area with 60 Hz mains and didn't have the Basic motor this might be an option to try:

For 60Hz, a 0.20uF cap in series with one winding seems to give the least motor
vibration. The measured phase difference is almost exactly 90 degrees. For 50
Hz, 0.22uF appears best. Note that the winding with the cap on shows a higher
voltage than the other winding. Adding any dropping resistors, either before the
cap to reduce both winding voltages, or after the cap to even voltages on both
windings, gives an increase in motor vibration.

In addition my Valhalla had the 'Zener Mod' that had been added by my Linn
dealer. This consists of two diodes and a resistor added between the grey and
blue outputs:
------Z1-----R------Z2------
| |
| |
Connect to Connect to
Grey Wire Blue Wire
Terminal Terminal

Where R=12K - Looks like a 0.25W Carbon film 0.5W might be safer. Z1 and Z2 are
Zener diodes type 1N5266B"

This post is made possible by the generous support of people like you and our sponsors:

Atma-Sphere Music Systems, Inc.

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