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More on equalization curves

From 78rpm through to RIAA equalization

The Jazz Club, Revelation M and Revelation C phono stage preamps offer more than the standard RIAA equalisation required for modern vinyl. They supply the correct EQ for the majority of electric phonograph records ever made.

Scrolling down this page we show "thumbnail" pictures of all the reproduction curves of these wondrous phono stage preamps. Each "thumbnail" is clickable to reveal a larger version in a new window or tab depending on your browser type.

It wasn't just 78s that featured differing equalization - early LPs and EPs did too.

"For years I put the muffled tones of a lot of 78s down to the restrictions of the recording techniques of the period. Then I discovered that different manufacturers had used differing amounts of treble or bass in their recordings (correctly called equalisation), and that tone controls were fitted to amplifiers for correction of this"

[Tony Bolton, Graham Slee Revelation, Hi-Fi World, May 2008]

(This webpage will neatly print onto 4 sheets of A4 with most browsers. For document size paper you may have to select "print preview" from the file menu and select "shrink to fit")

Old LP's and singles
Switch positions (left to right)	Equalize these record labels
0 - 13.7 - 250	Early FFRR (pre '53) click for full size curve
11 - 0 - 500	FFRR (Decca/London), MGM, EMI, HMV, RCA Victor, English Columbia click for full size curve
0 - 13.7 - 500	RIAA, CCIR (All modern vinyl) click for full size curve
0 - 16 - 500	NAB (NARTB), American Columbia click for full size curve

78's
Switch positions (left to right)	Equalize these record labels
0 - 0 - 250	Columbia (English), EMI, HMV click for full size curve
5 - 0 - 250	Columbia (American 1925 onward), FFRR, Victor (1925 onward/some) click for full size curve
0 - 16 - 250	Columbia (American 1938 onward) click for full size curve
5 - 0 - 375	Victor (1925 onward/some) click for full size curve
11 - 0 - 375	Capitol, Early Decca, Mercury click for full size curve

0 - 0 - 500	Brunswick, Parlophone click for full size curve
5 - 0 - 500	Victor (1925 onward/some, and 1938-47) click for full size curve
11 - 0 - 500	MGM, Victor (1947 onward) click for full size curve

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Award Winning Audio Components

Enjoythemusic.com Blue Note award for Solo Headphone Amplifier

Stereo Times most wanted component award, 2007

2005 Hi-Fi News award for Ear Gold V and Elevator EXP

onheadphones.com Editor's Choice Logo for Headphone Amplifier

Hi-Fi News 2004 Award Logo

GRAHAM SLEE PROJECTS LIMITED
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United Kingdom
Company Registered in England and Wales - Registered Number: 5637059

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