----- Original Message -----
From: "Ron Fial" <[log in to unmask]>
> Has anyone tell us what they mean by a 'clean' 78, or a 'cleaned' 78.
> It makes more sense to have a contest between machines after agreement
about how the 'clean-ness' of a 78 is measured. I am no expert, but here
are some possible criteria, and I suppose you could give a numeric weight to
each measurement to come up with a cleaning 'score'. I am sure there are
many other measures that could be taken, like actual signal to noise ratio
and the like.
> 1) presence of dirt or microscopic metal particles in the groves.
> 2) Lowest noise levels in a quiet section of grove.
> 3) Lowest ionic contamination ( part of the 'cleaned' record is dipped
into distilled water and stirred. Then the ohmic resistance of the water is
measured, the resistance will drop due to ionic contamination).
> 4) The record after cleaning sounds better, has less distortion, less
residual noise in quiet parts of the grove.
> 5) The record after cleaning has shinier surface. This could be due to
dirt removal or actual surface
> polishing, but this could be due to residual oils or soaps also, which is
probably not a good result.
Of all of these, #4 is the only one which has any actual applicability! #2
is part of #4...#1 and #3
are of interest primarily to research chemists, unless any become catalysts
for the chemical breakdown
of shellac..and #5 can be easily simulated with a can of black Shinola!
Steven C. Barr