Vintage DD turntables. Are we living dangerously?

Halcro:

Not quite bridge design, but google the "Bayonne Bridge roadway raising". Still the world's 4th longest single arch at nearly 100 years old, only the original arch will remain when work is completed in 2017. I visited family in Bayonne last month and was amazed to see the project even  at partial completion. 

I hope my being an SP10/Krebs upgrade owner allows me to go briefly off topic...

So that's the Bayonne Bridge...?
When I first visited NY in 1984, I was shocked to see what I thought was a copy of our famous Sydney Harbour Bridge which opened in 1932
http://2.bp.blogspot.com/-xM4JuGOb_fc/T2VA_JxTW7I/AAAAAAAADm8/4gtCt_JPpWc/s1600/SydneyHarbourToday.j...
I must say....it doesn't look as attractive with the raised roadway..🤐
And speaking about expansion of metals.....at the two bases of the arch of the SHB, there are giant steel rollers so that the arch can 'spread' due to load and expansion. Those stone pylons are purely decorative...

Halcro, I agree with you completely that the Bayonne Bridge will be less attractive with the raised deck. I spent my youth living in the shadow of the original design.  We used to jog the walkway, summer and winter, with a spectacular view of the southern tip of Manhattan. 

Anyone please explain me what is the difference between Victor TT81 and TT-801 ?  

Chakster, The TT801 incorporates a platter that is perforated and lined with a rubber gasket to facilitate vacuum hold-down.  To generate the vacuum, you also got a pump housed in a separate external (large) wood-veneered chassis.  Like Halcro said above, the problem these days is that by now the gasket usually has deteriorated; the rubber used was not up to modern standards.  Yet, the TT801 seems to sell for a huge premium over the TT101 and TT81, in the Far East.  They are rare. Whether the basic table is akin to a TT101 or TT81, I am not sure.  I used to think it was a hot-rod TT101, but since Halcro says the TT801 lacks the stepped speed control found on the TT101, perhaps it is more like a TT81, plus vacuum platter.