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Proper turntable speed adjust range?
Proper turntable speed adjust range?
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Old 24th December 2018, 08:16 AM   #1
lens42 is offline lens42  United States
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Default Proper turntable speed adjust range?

I have a Philips 212 turntable that I bought new in the 70ís. Now, 40 years later, it has developed all the well known controller ailments, so Iíve decided to gut the control board and convert it to Arduino control for the touch buttons and motor. I want to retain all the original functions but I donít know what the adjustment range of the fine-tune speed knobs should be. What normal? +/-2% ?
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Old 24th December 2018, 10:21 AM   #2
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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Most older turntables used a synchronous motor and the speed was dictated by the frequency of the mains supply, which was held within a very close tolerance. A lot closer than most turntables using an electronic loop system.

Specifications

Drive method: belt drive
Speed control: electronic
Speeds: 33 and 45rpm
Speed adjustment range: +-3%
Wow and flutter: 0.1%
Rumble: 62dB
Arm friction: 15 mgf
Stylus force: 0.75 to 4g
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Old 25th December 2018, 02:38 AM   #3
lens42 is offline lens42  United States
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Thanks for the specs. +/-3% is the number Iím looking for. The 212 definitely has a DC motor with a feedback loop, so I canít change to synchronous.

Out of curiosity, in a turntable with synchronous drive licked to the line frequency, how is +/-3% adjustment implemented?
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Old 25th December 2018, 07:00 AM   #4
wiseoldtech is offline wiseoldtech  United States
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Quote:
Originally Posted by lens42 View Post
Thanks for the specs. +/-3% is the number Iím looking for. The 212 definitely has a DC motor with a feedback loop, so I canít change to synchronous.

Out of curiosity, in a turntable with synchronous drive licked to the line frequency, how is +/-3% adjustment implemented?

Usually by having a tapered motor shaft - see Dual 10/12xx models.
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Old 10th February 2019, 06:55 PM   #5
carlthess40 is offline carlthess40  United States
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Hi wiseoldtech
Do you work in turntables?
I have a old Sansui RF2060 and I have the same speed problems with it
Do you know if it works the same as this guys Philips table? Iíve done all the things people have said. Clean the pulley. Maybe it has the 50hz pulley instead of the 60hz
Well it has both with it and I tried both of the
When I cleaned the 60hz pulley that was on the motor it all of sudden start to work at the right speed, well at lest for 3 or 4 LPís and then the speed dropped down to 23/25 rpm
How do check the motor or the power supply system? I have a scope and Iím a somewhat newbie with it
Any help would be great
Thanks
Carl
56286653125__65BAA2B3-41C3-4137-8711-24EAF5A51715.jpgIMG_2410.jpgIMG_2412.jpg
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Old 11th February 2019, 02:40 AM   #6
PRR is offline PRR  United States
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Does the motor, without belt, spin smoothly? Or stiff?
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Old 11th February 2019, 05:16 AM   #7
carlthess40 is offline carlthess40  United States
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I will have to check that. If I remember, it did have some resistance to it. Itís not like if I was to spin in with my fingers it would just free spin
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