On Wed, 06 Feb 2008 13:14:24 +0000, Audix wrote:

I know the Decca PPM and have a pair of them. Mine use Ernest Turner
703 movements, scaled from -30 to +18dB. The drive amps to go with
them are a custom Decca job too. I have also seen an Ernest Turner
early twin movement with Decca scales. I have never seen a formal
specification of the Decca PPM.

Not a BBC scale then? Remember the BBC engineering version of the
motto: "Nation shall peak 6 unto nation"

d

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Pearce Consulting
http://www.pearce.uk.com