Raul, There were 3 posts dated October, 2020, ahead of mine. The last post before that was January, 2020, by Thuchan. Anyway, you know this is one of my favorite subjects, so I often cannot resist a comment on relevant threads. On the DP80, if you use the manual speed corrector, it disengages the quartz-reference in the servo, so it is really a feature that one is best off to ignore.
Chakster, I would agree; by far the majority of TT101s are built to run on 100V only, but I have never seen one labeled "JVC" in lieu of "Victor". I only noticed the 100/120 voltage feature on mine after I bought it. Good that you have engaged the services of JP Jones, who fixed mine after 2 years of frustration on my part. I "found" JP on a Technics SP10 thread; he has successfully built the SP10 integrated circuit necessary to run the Mk2 and Mk3, out of discrete parts that fit in the same space afforded to the IC, using SMDs. Until JP made his part available, Mk2 and Mk3 users had to stow away old SL1200s, some of which also used this same chip for speed control, in case of chip failure. His home made chip is a bit more accurate than the original. Thus, although my SP10 MK3 was working perfectly, I eventually had JP install his chip into it.
You may want to know that after JP found the fault in my TT101, it has run perfectly for the last two or more years. (The PCB was cracked, and the crack ran under a solder joint which covered the flaw, creating an intermittent problem. Only a truly knowledgeable person would even think to look for it since it was rendered invisible by the solder and because of the intermittent nature.) JP is simply "the best".
Chakster, I would agree; by far the majority of TT101s are built to run on 100V only, but I have never seen one labeled "JVC" in lieu of "Victor". I only noticed the 100/120 voltage feature on mine after I bought it. Good that you have engaged the services of JP Jones, who fixed mine after 2 years of frustration on my part. I "found" JP on a Technics SP10 thread; he has successfully built the SP10 integrated circuit necessary to run the Mk2 and Mk3, out of discrete parts that fit in the same space afforded to the IC, using SMDs. Until JP made his part available, Mk2 and Mk3 users had to stow away old SL1200s, some of which also used this same chip for speed control, in case of chip failure. His home made chip is a bit more accurate than the original. Thus, although my SP10 MK3 was working perfectly, I eventually had JP install his chip into it.
You may want to know that after JP found the fault in my TT101, it has run perfectly for the last two or more years. (The PCB was cracked, and the crack ran under a solder joint which covered the flaw, creating an intermittent problem. Only a truly knowledgeable person would even think to look for it since it was rendered invisible by the solder and because of the intermittent nature.) JP is simply "the best".