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Legacy Personal Blogs Vintage Turntable repair: Can I fix a Perpetuum Ebner from 1958 - part 1
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  • Author Author: Jan Cumps
  • Date Created: 9 Feb 2015 7:34 PM Date Created
  • Views 2563 views
  • Likes 3 likes
  • Comments 4 comments
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Vintage Turntable repair: Can I fix a Perpetuum Ebner from 1958 - part 1

Jan Cumps
Jan Cumps
9 Feb 2015

For almost a year I have a vintage turntable from Perpetuum Ebner at home.

It's not mine. It belongs to someone that asked me to fix it. And it turned out that fixing the motor would cost too much.

I asked the owner to collect the tt. That hasn't happened yet and the machine is collecting dust at my home.

 

So I'll take the freedom to attempt a non-intrusive repair with modern components. I'm also thinking about making it an Enchanted Object.

 

image

 

Perpetuum Ebner was a Turntable factory from the Black Forest. The founder was part of the same family that started Dual. Both were located in the same area and produced classic designs.

The model that I'm hacking here is the PE Musical 1 from 1958.

The history of the PE company is well documented on the internet.

 

 

The main focus will be to get a new motor. There are only a few criteria: it has to run smooth and silent and needs to be able to run for a long time.

I'll need to build in a motor controller and a tachometer. I'll have to provide the control logic to keep the speed constant - doing very slow adjustment when needed.

 

I am also thinking about adding functionality. I can measure and publish statistics on its use. I may even be able to stream the audio.

That is the idea that I'm playing with most: make it an audio server for a wireless home music network.

 

image

 

I'll post progress on the @element14 blog. I can use help on choosing a good silent motor.

 

 

As a sad side note: the failed 'traditional' repair attempt:

 

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Related posts
Vintage Turntable repair: Can I fix a Perpetuum Ebner from 1958 - part 2 - Calculating the Motor Speed
Vintage Turntable repair: Can I fix a Perpetuum Ebner from 1958 - part 3 - Infineon Motor Driver shield
Vintage Turntable repair: Can I fix a Perpetuum Ebner from 1958 - part 4 - Hercules LaunchPad Enhanced PWM try-out
Vintage Turntable repair: Can I fix a Perpetuum Ebner from 1958 - part 5 - Yes I Can
Vintage Turntable repair: Can I fix a Perpetuum Ebner from 1958 - part 6 - Speed Adjustment with Variable Duty Cycle
Vintage Turntable repair: Can I fix a Perpetuum Ebner from 1958 - part 7 - Make Speed Sensor from Scrap Parts
Vintage Turntable repair: Can I fix a Perpetuum Ebner from 1958 - part 8 - Sample the Motor Speed with Microcontroller
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Top Comments

  • M0DCD
    M0DCD over 10 years ago +1
    Have you any idea about what motor speed you would need to get the 33 1/3rd and 45rpm for the turntable from the gearing?
  • M0DCD
    M0DCD over 10 years ago in reply to Jan Cumps +1
    Looks like a simple induction motor with a 3000rpm nominal will be for this, pretty standard for a 50Hz one. That makes repair rather easier.
  • M0DCD
    M0DCD over 10 years ago in reply to Jan Cumps

    Looks like a simple induction motor with a 3000rpm nominal will be for this, pretty standard for a 50Hz one. That makes repair rather easier.

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  • Jan Cumps
    Jan Cumps over 10 years ago in reply to M0DCD

    My measurements and calculations say I should aim for 2925 - 2929 RPM.

     

    image

     

    I have done calculations for the 33.3 and 45 RPM range.

    First multiplied the RPM by factor of (platter rim / speed gang) - speed gang is different for each speed, platter rim is constant accross speeds

    Then multiplied that by factor of (belt rim / motor pulley) - constant factors across speeds

     

    45 RPM: 45 * (177.2 / 14.7) * (29.7 / 5.5) = 2929,2245 RPM

    33 RPM: 33.3333 * (177.2 / 10.9) * (29.7 / 5.5) = 2926,7 RPM

     

    The small difference can be attributed to measure errors.

     

    All of this assumes that I can repurpose the original 5.5mm pulley

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  • Jan Cumps
    Jan Cumps over 10 years ago in reply to M0DCD

    I don't know the required speed yet.

    The motor require a single constant speed. The TT is belt drive/idler drive combination.

    I'll have to refresh my calculus, measure the diameters of the motor pulley,the 4 ganged tapped wheel, (not the idler rubber wheel because that is just a power transmitter, no reduction there) and the turntable platter rim.

     

    image

    image

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  • M0DCD
    M0DCD over 10 years ago

    Have you any idea about what motor speed you would need to get the 33 1/3rd and 45rpm for the turntable from the gearing?

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