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Path: utzoo!mnetor!seismo!rochester!ken
From: ken@rochester.arpa (Ken Yap)
Newsgroups: sci.electronics
Subject: Re: Power Supplies for Tube Circuits.
Message-ID: <453@sol.ARPA>
Date: Fri, 3-Jul-87 19:39:22 EDT
Article-I.D.: sol.453
Posted: Fri Jul  3 19:39:22 1987
Date-Received: Sat, 4-Jul-87 14:35:45 EDT
References: <12887@rose.UUCP>
Reply-To: ken@rochester.UUCP (Ken Yap)
Distribution: na
Organization: U of Rochester, CS Dept, Rochester, NY
Lines: 15

Don't do that! It ties your audio circuit to the power line in an
undesirable way. It probably wouldn't work because

1. The neutral of the 110 V input is close to ground potential.
2. The negative rail of your will be at some 140 V below the
neutral, assuming the full wave doubler, or at neutral, if you
use the half wave doubler.
3. In the first case, this makes the ground point of your audio -140 V
DC live wrt true ground, assuming it doesn't short first. In the second
case, this creates a giant ground loop which will make your woofer
vibrate with hum.

Go buy a transformer. For your safety, listening pleasure and peace of mind.

	Ken