Vintage DD turntables. Are we living dangerously?

lewm

When I purchased my DP80, it was not running correctly. It did "run" but there was a problem; at this point in time I've forgotten what it was. It's a 100VAC model, and the seller told me he ran it with 120VAC. No wonder it was problematic.

Yup, no wonder. I do not believe that the DP-80 was ever made in a 120VAC model. When I bought my DP-80 back in the late-70s - brand new from a Denon dealer -  it was delivered with a Denon-branded step-down transformer.

Dear @cleeds : You are rigth the DP-80 never was manufactured to run at 120VAC . My unit comes exaxctly as yours but the 75 comes with no step down transformer.

I think that the unit that bougth lewm was modified in some ways to run at 120VAC.

I don't know other DP-80 owners but my unit from new ( and the 75 too. )  always play as " new " and I have in stock status. 

Btw, maybe the 101 design is very good but the JVC excecution was not at levels of Denon or Technics and even its manufacturer specs are inferior to the Denon's.

101:  w&f  0.020%    s/n   75db  speed accuracy   0.002%

DP-75:  w/f   0.15%    s/n   80db   speed accuracy    0.002%

Even the JVC 71 has better spec than the 101 in s/n db. Main difference between the 71 and 81 is the double/bi-directional servo that does not comes in the 71 and of course the higher price.

Regards and enjoy the MUSIC NOT DISTORTIONS,
R.

Dear Raul,

If you heard no differences between the TT-71 and TT-81....then something was very wrong.
Either the TT-81 was faulty, the system it was connected to was not revealing or you are simply unable to hear discriminately  🤔
The differences between the TT-81 and TT-71 are far more marked than those between the TT-81 and TT-101 starting with the bi-directional servo control which is a patented breakthrough in DD technology and is the reason that the Yamaha GT-2000 (which uses the same Victor bi-directional servo motor) is so desirable.

Halcro, do you have the patent number?  The TT-101 service manual describes the bi-directional servo as the differences between a simple F/V servo which has to coast to slow down, and a PLL which is bi-directional in this sense, and is something every 'table with a PLL (aka Quartz Locked) has.  

Dear @halcro : Fortunatelly the JVC chasis is very similar to my Denons and I mounted both in the custom plinths of both Denons with the same tonearm. Maybe you are rigth and I am " simple unable to hear discriminately..".

You need to grow-up in your knowledge and ignorance levels. I don't know what happens with you because I think that in this same thread ( if not in other where you posted too. ) I posted that that " touted " bi-directional servo in the JVC and that for you is the " penultimate wonder " on TT was a unique in JVC designs when was and not is  ( I don't know where you try to learn or with what kind of audio advisors you are surrounded. ) that way because not only what jp posted but Denon stated about that bi-directional servo in its DP-70M and latter on the DP70L models.

I assume that you think that discovered the " black thread " with the JVC. Wrong, nothing special. It's one units in the  japanese TTs bunch and that's all. Obviously that when some one ignore audio information can makes a misunderstanding in this and other audio subjects.

So, what are you talking about?

Better than that please do it a favor let it go the JVC in change for the new Technics units.

Regards and enjoy the MUSIC NOT DISTORTIONS,
R.