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ARSCLIST  January 2008

ARSCLIST January 2008

Subject:

Re: fwd: Modifying a linear turntable

From:

phillip holmes <[log in to unmask]>

Reply-To:

Association for Recorded Sound Discussion List <[log in to unmask]>

Date:

Thu, 10 Jan 2008 20:11:50 -0600

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (45 lines)

My thoughts are:  Get a Rabco SL8e, which is a better arm.  Mount it on 
anything that will accept the arm (Thorens TD124 or TD125 or Lenco in a 
custom base, or....).  I think you're going to run into problems and 
frustration with this project.  However, if you get it to work, please 
post the modification on the internet.  Thanks,
Phillip

David Lennick wrote:
> Anyone have any thoughts on this? Enrico Borsetti is an ARSC member 
> but not subscribed to the list.
>
>
> enrico borsetti wrote:
>>  
>> I had an idea recently regarding a modification on a turntable I 
>> have. I am using for the 26th year my loyal Revox B790 linear 
>> tracking turntable but it has only 33 and 45 speeds. I have many 78 
>> rpm records and I want to buy another  B790 since being linear 
>> tracking it gives no aural distortion when the arm get close to the 
>> label as you know. The speed control unit, which is made by easy to 
>> find IC's, should be modified in manner to let the table spin at 78. 
>> I have the schematic of the motherboard and arm control unit of the 
>> B790. Today the whole work done by these old IC's can be made with a 
>> single PIC microcontroller 
>> (http://en.wikipedia.org/wiki/PIC_microcontroller).
>>  
>> Do you know of any Electronic engineer (and record collector at the 
>> same time) interested to take part in this 'upgrade' project?
>> I think this 'upgrade' project could be of interest to many 
>> collectors and our 78-L friends since this 'table pops-up often on 
>> ebay and at reasonable prices, I saw it around $200/$300 in working 
>> condition. If the upgrade will be produced in a certain quantity the 
>> motherboard cost will be around $60 if not even less. So within $350 
>> you can play your 78's but with the quality of a linear tracking table!
>>  
>> Let me know what you think about it.
>>  
>> All the best   Enrico
>> -------------------------------------------------------
>
> Replies will be forwarded.  Thanks!
>
> dl
>

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