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Vintage DD turntables. Are we living dangerously?

I have just acquired a 32 year old JVC/Victor TT-101 DD turntable after having its lesser brother, the TT-81 for the last year.
TT-101
This is one of the great DD designs made at a time when the giant Japanese electronics companies like Technics, Denon, JVC/Victor and Pioneer could pour millions of dollars into 'flagship' models to 'enhance' their lower range models which often sold in the millions.
Because of their complexity however.......if they malfunction.....parts are 'unobtanium'....and they often cannot be repaired.
128x128halcro
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banquo363
371 posts
 
hiho,

The english flyer for the jvc ql8 has a small black and white pic of the tt81 motor. Take a look and see if you can tell whether it's a coreless motor or not.
hiho
451 posts
 

More observations I made earlier in the other thread.

Here's the major clue from the vintageknobs page.

Halcro did post some innards pictures of his TT81 but short of the inside of the motor. That TT81 looks awfully close to the TT71 motor.

Yes, Halcro needs to take apart his TT81 to settle the score! :-D

_______
omsed
145 posts
 
Living in the past and in denial, not dangerously.
timeltel
830 posts
 
Regards. Hiho is correct. For a description of JVC technology in the above TTs:

http://www.vinylengine.com/library/jvc/turntable-technology.shtml

A later catalogue states ALL TTs are equipped with coreless motors.

Peace,
halcro's avatar
halcro OP
2,664 posts
 
Wonderful information, photos and Links from HiHo as usual.........
I really think from the descriptions of the TT-81 and TT-101 motors in their respective Service Manuals....that HiHo and Caligari are correct about the TT-81 NOT being a 'coreless' motor?
As for me taking apart my TT-81.......HaHa HiHo.....and you too Banquo....:-)

But for your collection of images HiHo......here are all the ones I have of my TT-81:-
TT-81
TT-81
TT-81
TT-81

If the TT-71 and TT-81 motors are the same......why have the two models?
The TT-71 motor is described as "12-pole, 24-slot, DC type FG servomotor with Starting Torque of more than 1Kg-Cm and Drift per hour of 0.0001%"....whilst the TT-81 motor is described as "DC Servomotor with Starting Torque of 1.3Kg-Cm and Drift per hour of 0.0004%".
These are different specifications with the added benefit of the TT-81 having quartz-locked positive and negative servo control as does the TT-101.
Perhaps the most defining clue to the differing motors is in their Power consumption...13 watts for the TT-81 and 15 watts for the TT-71.
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