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Old 6th January 2011, 07:58 PM
colin.hepburn colin.hepburn is offline
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Join Date: Jan 2006
Location: Newtonhill Aberdeenshire
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Default Re: 3 Series smoothing

Originally Posted by John Caswell View Post
Hi all,
The battery bias mod is very simple and consists of removing the first stage cathode bias resistor, (and capacitor if fitted) and replacing it with an "AAA" or "AA" NiCd battery, +ve to cathode of the valve, -ve to ground.
If you use standard NiCds do not use a plastic battery holder, try to get metal ones from CPC as they do not "stretch" Better still get tagged types and then solder them in permanently. They won't discharge when the phono is off.
I think it gives a more defined solid sound but then others may not. Once again I leave it up yo you to listen and decide.


Thanks John
I See my inquiry was only due to Nick Gs version which involved some resistor value changes to the R.I.A.A plus a CCS to Anode of first stage and moded PSU
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File Type: jpg WD Phono II.jpg (45.2 KB, 30 views)
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