I think we're all on a similar page, and I think I'm just going to bag the idea alltogether. To me, that table sounds almost perfect, and I think for the work and money involved it's not going to be worth finding out that it doesn't make a audible difference. I really wanted to hear this, but I am happy with it, it's just this stupid internet is so tempting. I don't want a better table anytime soon, there is a lot of reasons why I like this one, so I'm just going to leave it. If I'm going to upgrade tables, it'll be another DIY. Thanks guys for not juicing it up with all the hype. A lot of times the internet makes it sound better just because it costs more.
I payed for the platter almost as much as I did for the whole table with the Lyra cartridge.:drunk: I'll probably sell it to fund a SAMA since my motor is very noisy.
In regards to the HW-19 Table, (and probably all others) modifications such as different Platters will have an impact on tonality, and other improvements might be accenting bass respnonse, and high frequency response, dependent upon the materials used.
As far as differences in sound that the one older bearing design provided, versus the newer inverted design, there may be some pros, and cons as to which is actually better. Some would probably say not much in the way of any differences noted. A standard style bearing, like VPI once used is not in some way inheritly flawed. Many high end Tables today still use such Bearing Designs, and it probably all comes down to build quality, implementation of materials used.
Many often claimed that the clear frosted acrylic platters that VPI used were basically sonically inferior to the older lead filled Platters that were used on Tables like the HW-19 (MK-IV) the Aries 1, and some of the TNT Models.
Then there was the VPI "Super Platter", but this has been MIA for quite a few years.
The hot "current" ticket is said to be the Classic Platter, an 18lb machined affair, but again, you would most likely need to implement a taller Armboard, and either a taller Dustcover, a custom whole Table Cover, or eliminate the cover altogether.
These changes will impart tonal changes, but may do little in the way of lowering noise floor, which all high quality Tables strive to accomplish.
Lowering noise floor, and transferrence of noise from Motors, and Bearings will go far to improve fidelity.
And in regards to your Table, and your noted problem of excessive Motor Noise, these Hurst AC Motors can be Oiled, and one can perhaps get lucky with quieter motor operation.
Underneath the Motor Pulley, where the actual Metal Drive Shaft enters the Motor Housing, it is permissible to oil in this area, where the Shaft is held by a bushing. One drop of 40w Motor Oil may solve your noise issues for the time being.
I have the VPI SAMA on my HW-19. It is actually the exact same Hurst AC Motor, housed in its own Case, so with that said, it is not in any way somehow quieter than the stock motor provided it is working properly, but by isolating it apart from the Table's Base, one can expect a slightly lower transferrence of vibration, and noise to the rest of the Table.