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My Empire 598 III came with a Yamaha belt and ran fast.After reading and asking about belts I decided to try belts from both Elex Etalier (LP Gear) and Turntable Basics.
The table still runs fast with each of these belts.
With the Elex Etalier, it runs a bit more than 3% fast. Adjusting the drive pulley angle does not appear to have much effect on the speed, possibly because the belt width is such that it always significantly overlaps the crown of the motor pulley.
With the Turntable Basics belt, which is narrower, I can adjust the drive pulley angle such that the platter speed drops down to about 1% fast.
The drive is much "springier" with the narrower Turntable Basics belt.
Some unconfirmed impressions are:
- The turntable sounds as though it has "more drive" with the Elex Etalier belt. Perhaps because of the speed or perhaps because of better coupling of the motor inertia to the platter.
- I hear less noise when standing beside the TT with the Elex Etalier belt, possibly due to lower tension and less lateral force on the bearings.It seems as though I really want a belt at least as stiff as the Elex Etalier belt, as narrow as the Turntable Basics belt (to get speed adjustability) and thinner than either (so the platter speed will drop).
I think I recall someone mentioning original belts made of latex and fabric. Such belts could have the desired properties.
If I can't get such a belt, I think that the most practical solution might be to wrap some tape around the subplatter to get the right speed. IIRC JoeLongwood did this.
Anyone have any thoughts on this?
Regards
David
PS: For those who are interested, here are some approximate measurements:
Turntable:
- String length around the belt path:- 838mmBelts:(Yamaha = Y, ElexEtalier = EE, Turntable basis = TB)
- Slack length of belt: Y=762mm, EE =812mm, TB=783mm
- Belt width: Y=5.0mm, EE =5.1mm, TB=4.1mm
- Belt thickness: Y=0.71mm, EE =0.66mm, TB=0.66mmAnd here are some calculated values
- Belt spring const: Y=0.28mm/gmf, EE=0.26mm/gmf, TB=0.36mm/gmf
- Belt Tension installed: Y=24gmf, EE=7gmf, TB=20gmfNote: The slack lengths are as measured, not "as supplied", each of the belts had been on the table and off it for varying lengths of time.
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Topic - Empire 598 III belts and speed (long) - energyandair 12:07:17 03/11/07 (13)
- Temporary Solution - energyandair 20:26:50 03/11/07 (0)
- Belts too thick - Mark Kelly 15:55:51 03/11/07 (4)
- I agree, but what is the best thing to do - energyandair 16:34:20 03/11/07 (3)
- Well, being me.... - Mark Kelly 17:05:35 03/11/07 (2)
- Re: Well, being me.... - energyandair 17:14:24 03/11/07 (1)
- $USD150 - Mark Kelly 18:50:58 03/11/07 (0)
- Re: Empire 598 III belts and speed (long) - "skeptic" 12:57:07 03/11/07 (5)
- Re: Empire 598 III belts and speed (long) - energyandair 13:21:07 03/11/07 (4)
- Re: KAB strobe is more accurate and will likely show - grinagog 16:15:49 03/11/07 (1)
- Re: KAB strobe is more accurate and will likely show - energyandair 16:43:49 03/11/07 (0)
- What kind of shape are the motor mount bushings - DaveInVA 14:20:05 03/11/07 (1)
- The motor mount bushings seem OK - energyandair 15:35:22 03/11/07 (0)
- Empire belts and speed MY TAKE... - Phil_in_CA 12:37:09 03/11/07 (0)