I'm basing my mods on an article I found in 1982 (Popular Electronics,
April 1982, pp. 77-9). It describes how to mod the 45 speed control
circuit on a Technics SL-D1. Any good audiophile forum site will mention
Basically, the mod changes the resistance in the control circuit that
generates the reference frequency. A circuit diagram for your SL-5200
will be very helpful and the layout of the circuit board may affect your
choices. If you throw in a switch, you can play your 45s and your 78s.
On 20 Jan 2011 at 10:25, Steve Wertheim wrote:
> I saw your note about modifying your SL-1700 to play 78s. I have a
> SL-5200 that I bought circa 1977 that still works perfectly well.
> It's got the quartz-lock control with the speed adjust option of +/-
> 33% but only supports 33/45. I have a number of 78s that I would
> like to transcribe and would prefer to use my Technics with a good
> ceramic needle as opposed to most of the junk that's on the market
> today. Can you advise on how you're doing the modification?