Yes, it is doable. But your target market would be small, fabrication would best be done by someone who works with granite
You can make a turntable like that, but you can not introduce it at a $1000 retail price (without personal financial risk/loss).
For a piece of granite you can just go to any good stonemason, he can cut any shape or form with modern equipment. They can make the most intricate headstones and ornaments so a tiny slab with a few holes will be no challenge. Just hand him a dwg and a slab of 2 ftsq won't cost you $200. I asked for a similar base for my extra arm and that was <$75.
But what you are forgetting: if you want to sell something commercially you need to hold a considerable margin (like 100%) for extra costs like shipping, storing, guarantee (stone can break and chip), office and personnel costs, assembly costs, PR, advertising, taxes, fees what have you. In short, if you would want to sell a TT for $1000 you should be able to manufacture it for half that, $500. So if you could make it DIY for $1000 and sell it for $1000 you would do all that work for just making someone else happy, not for earning your own bread. So even trowing on a $300 arm would make the whole project rather taxing... If you want to go commercial you need a business plan. Especially if you want to wrap on the door of a bank (which I advise against, but still).
I am listening to my newly modded Yaqin MS22b phonoamp now. I am quite pleased with it. It sounds very fluid and musical, slightly warm. My Jolida JD9 sounds tighter and more neutral, cd like (it has 3 opamps in a row). I am not sure about the deepest bass though.
Bass is there allright. I am playing Dead Can Dance - Anastasis now and boy, is there bass! Enough to waken the dead (pun intended, anastasis
). I don't know yet if this soundcharacter is maybe a little too much of a good thing in combination with the Koetsu Urushi and the Classic 16.2 300B amplifier which are both very full bodied. But with the bleak Decca this should be a bonus.
I did notice a slight hum when playing music, but it's definitely not the Yaqin. It's dead quiet. Really happy with that.
Now the Jolida JD9 s back on the operating table. Still not done with that little bugger. I need to pull hard on the reigns of that fullblood. Playing from the DAC I have the volume at 10 (full open), with the Yaqin (only 1 ECC83 per side) at 4-5 and with the JD9 only 3! It is quite loud. And it uses 3 opamps in a row, 2 10K resistors in between somewhere (why amplify and then attenuate?) and, again, 2 ECC83 as a buffer. I mean, come on. Ok, I don't need the extra amplification for MC since I use a tranny but I still see it as overkill. I am going to see if I can take out one or maybe two opamps. Leaving just one opamp and the riaa feedback-loop. I wish I would understand the schematic better. I need some help with that. I see a feedbackloop at every opamp, so maybe I'm mistaken about taking one opamp out. But I see the the dipswitch for MM/MC in the same feedback loop (after which opamp there are 2 10k R in parallel). I think I can skip that opamp incl the 5k, plus one whopping 4.7uF couplingcap. That should improve sound considerably. Leaving out things you don't need is always a good thing.
Edit: well, i've been studying up on opamps and that little feedbackloop is required for the opamp, so I think I can leave one out. I hope I don't ruin anything. Just for safety I'll put the original opamps in.Edited by ]eep - 12/30/13 at 5:03pm