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Re: [ARSCLIST] fwd: Modifying a linear turntable
perhaps the easiest solution would be to modify the vari-speed,
assuming it has one IF one could figure the proper resistance required
and replace the pot of the 45 position, what else would you need?
joe salerno
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
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Replies will be forwarded. Thanks!
dl