[sdiy] Transporting line level audio in home / buzz-free USB wall warts?

Mike Bryant mbryant at futurehorizons.com
Fri Jul 21 15:43:49 CEST 2023


Both are rather inaccurate voltages.  The original arrangement was just the open-anode of a single valve with the transformer moved to the speaker.  It was only when valve amps went push-pull with a transformer required in the amplifier that the HT voltage was removed from the speaker cable :-)

________________________________
From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Gordonjcp <gordonjcp at gjcp.net>
Sent: 21 July 2023 13:24
To: synth-diy at synth-diy.org <synth-diy at synth-diy.org>
Subject: Re: [sdiy] Transporting line level audio in home / buzz-free USB wall warts?

On Fri, Jul 21, 2023 at 01:15:23AM -0700, brianw wrote:
> I've been meaning to ask: What are you referring to with regard to "70V"?
>

Presumably 70V line, which is what Americans call 100V line. It's the kind of thing you use for Tannoys in large establishments. I look after several hundred such installs at work.

Gordon

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