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In Reply to: RE: SAS available again posted by flood2 on July 24, 2016 at 22:16:16
Sorry! I guess I shouldn't have responded because I really don't understand what you're talking about. I keyed in on the statement about 3% distortion at 15-kHz, which is basically meaningless without further qualification.
Sorry!
John Elison
Follow Ups:
...has test tones (20,18,16,14,10 and 5kHz) at -15dB ref 0dB, 5cm/s RMS for L and R channels at the inner and outer grooves for determining scanning loss/wear. I am not aware of any current test discs that have similar test tones, although any test disc with spot frequencies could be used. A cartridge manufacturer could specify the "life" based on any arbitrary frequency they chose and choose any distortion level that gave them favourable numbers.
Regards Anthony
"Beauty is Truth, Truth Beauty.." Keats
No worries! Just to reassure you for future interactions, I'm not given to attacking on the forum (unless provoked!) and least of all with people I respect. In fact, I was agreeing with you. The ill defined test conditions of the distortion level at 15kHz notwithstanding...my point was that quoting a specific lifetime is itself meaningless given the number of factors involved in determining wear. For a given tip, say a MicroLine in a PTGII tracking at 2g, you must get a higher wear rate than for the same tip in a V15VxMR tracking at 1g. Quoting 1000 hours as the life may give an indicative figure, but is clearly not going to be accurate.
The other point I was making about the wear rate was that if you play one record (not a test disc!), say, over and over, you will wear the tip at a greater rate than randomising the playback over a significantly larger sample of discs. Presumably this will be due to the wider variation in modulation level plus if you play back one single record, the particulate buildup in the grooves (shed from the tip) will accelerate the wear.
Regards Anthony
"Beauty is Truth, Truth Beauty.." Keats
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