Recently, I acquired a few test LPs from local used record shops. One is from Shure (1981), the other from Command (1960).
These are not PROFESSIONAL test records, like CBS, which are filled with test tones, tracking tests, wave specific tones (like square or triangle) , and extended sweeps.
These "pro-sumer" LPs do contain basic tones and stereo balance tests.
Perhaps the most important learned lesson is that the high-freq tones (6khz and 10 khz) REALLY reveal surface noise and pops. No doubt all the high-freq groove angles capture dust and particles that are difficult to remove. The LPs LOOK clean and general record cleaner and carbon fiber brush does not seem to thoroughly remove the embedded contaminants.
The Shure LP has a slight warp, and a steady 1khz tone sways the channel balance on the warp hump.
These are not PROFESSIONAL test records, like CBS, which are filled with test tones, tracking tests, wave specific tones (like square or triangle) , and extended sweeps.
These "pro-sumer" LPs do contain basic tones and stereo balance tests.
Perhaps the most important learned lesson is that the high-freq tones (6khz and 10 khz) REALLY reveal surface noise and pops. No doubt all the high-freq groove angles capture dust and particles that are difficult to remove. The LPs LOOK clean and general record cleaner and carbon fiber brush does not seem to thoroughly remove the embedded contaminants.
The Shure LP has a slight warp, and a steady 1khz tone sways the channel balance on the warp hump.
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