Revelation M, PSU1, Lautus

Great review, Bennett.
  You will find...
The forum members will help understanding audio equipment setup and control settings.

 Graham and I have posted some clarifications later in this topic.

Here to help,



Edited by BAK - 16 Jul 2016 at 6:58pm

Have a look here:

I hope to clarify further...

Graham Slee wrote: Bruce asked me to clarify what the switches on the Revelation do. The markings on them coincide with the "turnover" and "rolloff" found here: http://www.shellac.org/wams/wequal.html I included three turnover frequencies: 250Hz; 375Hz; and 500Hz. There is 3dB difference in level between each one. So, for example, when you look at a record needing 200Hz and you use 250Hz there is only going to be a very slight difference in level at that frequency, and probably well within the tolerance of the recording equipment at the time. Rolloffs are selected by the other two switches. These are the relative levels at 10kHz. A modern RIAA record calls for -13.7dB. A Decca FFRR LP calls for -11dB (usually), and American NAB (NARTB) call for -16dB. The other rolloffs are -5dB and 0dB (centre off's) which many 78s call for. The webpage Bob referred to gives suggestions as to their use with different record labels but the "WAMS" page deals with them in greater detail. The instruction sheet included with the Jazz Club and Revelation phono stages is a condensed version of all this, but it is better in my opinion to consult the two webpages linked so far, to find the closest match to the label in question. Even after all this it is often a case that tuning by ear gives the most acceptable result.

The link Bob gave... https://www.hifisystemcomponents.com/about/reproducing-old-records.html
  Shows a graphical representation of the WAMS link Graham gives above and gives switch settings to achieve the desired results.

 The 2 switches on the left both control the rolloff of the higher frequencies only.
Only 1 switch of the 2 will be used at a time and the other kept at 0 (zero).
The amount of rolloff is marked in decibels reduced at 10 kHz in reference to 1 kHz, 1 kHz is shown at 0 dB on the graphs.
 All recording frequency equalization charts and graphs have the desired results referenced to 1 kHz.

 The switch on the right selects the turnover frequencies (or break-point)
   1.  above which the high frequencies are reduced and
   2.  below same the low frequencies are boosted.
              (Keeping 1 kHz as a reference for boost and cut.)

 You will notice in the charts and graphs that the lowest frequency 20 Hz is always boosted 15 dB or more referenced to 1 kHz.
NAB, FFRR, and RIAA are boosted close to 20 dB at 20 Hz.
   The shape of the curve between 20 Hz and the turnover frequency selected is also changed by changing the turnover.

 Another technicality I see is the turnover frequency is + 3 dB more than the 1 kHz reference. This has to do with the frequency response of a turnover control circuit,

 If one knows the age and recording response applied to the disk to be played, then the switch selections can be chosen by the referenced links above. Many times this information is not available.
 I would test-play a disk and note the settings that sound best for each disk in my collection.