Nigel
Been here a while! 
Watching over Gotham City keeping us safe
Posts: 2,064
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Post by Nigel on Mar 27, 2015 17:00:13 GMT
Bought three test LP's for very little.
Decca - How To Give Yourself A Stereo Check Out.
Shure - An Audio Obstacle Course.
Gramophone - The Enjoyment Of Stereo.
My cartridge sailed through the groove jumping sections. Should hope so as two of the albums are circa 1960's. The anti-skate band sections on all three LP's are in different places. If my anti-skate is perfect near the start of an LP, it is not at optimum at the end of the side. Likewise, vice-versa. Is this just the way friction works or is there something amiss? Also, where is the best place to set the anti-skate on a ungrooved area, start, middle or end of side?
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Nigel
Been here a while!
Watching over Gotham City keeping us safe
Posts: 2,064
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Post by Nigel on Mar 27, 2015 17:02:43 GMT
Oh yeah, forgot to mention, what do people think of Hi-Fi Test Records? Any decent recommendations?
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jc
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Post by jc on Mar 27, 2015 19:09:59 GMT
The anti-skate band sections on all three LP's are in different places. If my anti-skate is perfect near the start of an LP, it is not at optimum at the end of the side. Likewise, vice-versa. Is this just the way friction works or is there something amiss? Also, where is the best place to set the anti-skate on a ungrooved area, start, middle or end of side? The anit-skate is the most difficult setting as there is no absolute correct setting! The force is variable over the entire playing surface of the LP thus the recommended anti-skating force is an average. I always started with the recommended figure and tuned in extremely small changes by ear, comparing start, middle and last tracks. The most pleasing was always VERY close to recommended which I think had more to do with the calibrated scale on the adjuster than any inaccuracy in the quoted figure. The exception is the bob-weight type. Are they more accurately made or is the adjustment too crude, whichever way the recommended seems to be best. |
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Deleted
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Post by Deleted on Mar 27, 2015 19:55:02 GMT
The anti-skate band sections on all three LP's are in different places. If my anti-skate is perfect near the start of an LP, it is not at optimum at the end of the side. Likewise, vice-versa. Is this just the way friction works or is there something amiss? Also, where is the best place to set the anti-skate on a ungrooved area, start, middle or end of side? The anit-skate is the most difficult setting as there is no absolute correct setting! The force is variable over the entire playing surface of the LP thus the recommended anti-skating force is an average. I always started with the recommended figure and tuned in extremely small changes by ear, comparing start, middle and last tracks. The most pleasing was always VERY close to recommended which I think had more to do with the calibrated scale on the adjuster than any inaccuracy in the quoted figure. The exception is the bob-weight type. Are they more accurately made or is the adjustment too crude, whichever way the recommended seems to be best. You would think that, in this digital world we live in now, that someone would invent a continuously variable digital anti-skate mechanism that would read the diminishing rotating circumference/diameter in relation to a fixed pivot arm and it's effect on the phono cartridge ability to stay in the groove, so to speak, thusly. I mean if they can print out houses and automobiles via digital 3d printing and all manner of military hardware/software integrations....why not a continuously variable anti-skate digital mech for our ancient turntables? Quah? |
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jc
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Post by jc on Mar 27, 2015 22:44:12 GMT
Linear tracking  |
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Post by videoguy on Jan 8, 2016 3:20:53 GMT
Just dug out my CBS Laboratory Test records to test the accuracy of my new MC preamp design. They are: STR 100 & STR 130. They are in pristine cond.
You can find them used on Amazon & ebay. Just saw STR 130 for $250-.
STR 100 contains tests for: 1. Frequency response. 2. Tone arm resonance. 3. Wavelength loss. 4. Channel separation. 5. Stylus Wear. 6. Compliance.
STR 130 RIAA Frequency Response Test Record. 1. Left, Right & Center. 2. Spot Frequency tests w voice announcements.
These records were mastered from the output of a laboratory oscillator; not from a recorded tape. CBS had an extensive research laboratory in suburban Connecticut. The STR 130 was originally made for Columbia Records disc mastering facilities & was used to calibrate the playback preamps in the disc mastering suites. The equalization of the cutting chain was then adjusted to match the calibrated playback preamp.
The chief mastering engineer at CBS Nashville, K.C. Rather was a friend of mine. In the late 70's I had a studio sales & design co., Audio Associates Inc. When I was finished with service calls downtown; I would often drop in to chat with K.C.
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