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Turntable not spinning fast enough on 45
powerstone05
post Jan 5 2013, 01:48
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I have (now) a GemSound BJL-1150. The problem I'm having is that the 45 rotation is quite slow and is noticeable in playing. The 33 seems to be fine though. I checked the belt and it's still in working order. Any ideas?
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powerstone05
post Jan 6 2013, 04:42
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Probably a stupid question but I know that playing a 33 LP at 45 and then slowing it down compromises the quality, but wouldn't the same thing happen if I play a 45 at 33 and then speed it up? (Yes I do plan to record some records off of it)
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Glenn Gundlach
post Jan 6 2013, 06:11
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QUOTE (powerstone05 @ Jan 5 2013, 19:42) *
Probably a stupid question but I know that playing a 33 LP at 45 and then slowing it down compromises the quality, but wouldn't the same thing happen if I play a 45 at 33 and then speed it up? (Yes I do plan to record some records off of it)

If the speed is only off a few percent 'tweaking' it in digital is OK. I don't know how big a problem it is but the RIAA curves crossover points should really track the speed difference but it's probably more of an OCD thing.
Question: You say the speed control is still slow when at +10%, is the speed _range_ about right? Does it seem to go to -20% less ? A 20% span would be a little more than 3 semitones.

G
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powerstone05
post Jan 6 2013, 06:52
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QUOTE (Glenn Gundlach @ Jan 6 2013, 00:11) *
QUOTE (powerstone05 @ Jan 5 2013, 19:42) *
Probably a stupid question but I know that playing a 33 LP at 45 and then slowing it down compromises the quality, but wouldn't the same thing happen if I play a 45 at 33 and then speed it up? (Yes I do plan to record some records off of it)

If the speed is only off a few percent 'tweaking' it in digital is OK. I don't know how big a problem it is but the RIAA curves crossover points should really track the speed difference but it's probably more of an OCD thing.
Question: You say the speed control is still slow when at +10%, is the speed _range_ about right? Does it seem to go to -20% less ? A 20% span would be a little more than 3 semitones.

G


Well I just posted a similar question over at the Audacity forums, and used the formula to determine the actual RPM. I did a test with a 12" single I have and put it on 45 with pitch adjustment at max (10%). The result was approximately 44.826 RPM, which bugged me, so close but not there. But its enough that I can notice.
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