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Re-Mastering 78s, Old Vinyl to CD & Noise ReductionRe-mastering 78s or copying old records to CD has become a complicated task often leading to disappointing results. Audio editing equipment and software for re-mastering 78s or old records to CD need not be so complicated. The correct EQ and better musicality can be easily obtained by using our Jazz Club and Revelation phono-stage preamps. And with these phono-stage preamps the need to de click and use noise reduction can be reduced and sometimes eliminated. The recording EQ of the 78 record and old vinyl records is different and sometimes substantially different from today's RIAA equalised vinyl records. Re-mastering studios often use a "flat" preamp followed by a parametric equaliser, running the risk of clipping the treble or even midrange frequencies which are reproduced by a magnetic pick-up cartridge progressively louder than the bass. The parametric or graphic-equaliser can add phase distortion which can worsen record damage noise, and make the record sound dull. Audio editing software which simply mimics this typical hardware set-up does exactly the same - so why use it? The Jazz Club and Revelation phono-stage preamps perform the necessary equalisation and pre-amplification in one go, using our wideband technique which brings these benefits
The Right EQ CurveThe Jazz Club and Revelation phono stage preamps feature 12 known equalisation curves selectable on the front panel using three simple toggle switches. Plus a further 3 curves to experiment with. Graphical representations of the known EQ curves for different switch positions are shown below. Mouse-over and click the EQ curves for the full size chart (charts open in a new window - Internet Explorer users should resize the new window for best resolution).
Further information on EQ curves for different record labels can be found at the WAMS web site. Jazz Club or Revelation Phono Stage Preamp?Although identical in many ways, the Jazz Club and Revelation phono stage preamps differ in their musical performance. The Jazz Club is based on our award winning Era Gold V RIAA phono-stage preamp. These are our first-generation extra-wideband phono-stage preamps, giving a more analytical sound, yet still more than capable of delivering the full emotion of the musical performance. The Revelation is based on our Era Gold REFLEX RIAA phono-stage preamp. These are our second-generation extra-wideband phono-stage preamps, giving a slightly warmer musical presentation, along with greater "slam" or "authority" not only in the bass, but across the full frequency spectrum, where the music requires it. Both of the phono-stage preamps they are based upon have received excellent reviews and feature in the Stereophile 2007 recommended components class-A guide. They were also awarded the triple dollar sign for best value for money. Moving Magnet or Moving Coil?Both the Jazz Club and Revelation phono-stage preamps are optimised for use with moving magnet or high-output moving coil cartridges. This means there is no performance compromises like you'd get from a dual-purpose circuit. For conventional (low output) moving coil cartridges, the Elevator EXP head amplifier is strongly recommended because it uses the same extra-wideband techniques of the Jazz Club and Revelation phono-stage preamps. It is also much better than a step-up transformer, the benefits being threefold:
This last benefit preserves the phase of the musical harmonics, working hand-in-hand with the Jazz Club and Revelation phono-stage preamps to provide a much more open "airy" sound. It also prevents fast leading edges of record defect noise overloading or causing "ringing" that you'd get with a transformer, which sustains defect noise making it much more noticeable. Mono UseA mono switch is provided on the rear of both the Jazz Club and the Revelation phono-stage preamps. In most cases it will give more than satisfactory results when playing mono records using a stereo pick-up cartridge. However, for "purist" results from mono recordings, a mono pick-up cartridge should be used and a shorted phono plug connected to the unused input (never the output!) to prevent open-circuit noise being modulated onto the channel in use. In this mode the mono switch should be left in the (centre) off position. A mono switch will never give true-mono from a stereo recording - the centre information so mixed will always give 6dB more power output instead of the 3dB true mono requires. The only way of achieving true-mono is by a constant power circuit which displaces left and right channels phase by 90 degrees. As this can seriously degrade the musical performance and record defect noise shaping, it is recommended that stereo recordings are left in stereo.
The Jazz Club Phono Stage Preamp |
The Revelation Phono Stage Preamp If you enjoyed reading this page or using the equipment it refers to, please link to it. The following HTML provides the link below the textbox.
Graham Slee Projects - Turntable And Headphone Audio |
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