TT drive belt

[RCruz]

Yes if you use o rings as i did

I read about that before....

How does it sound with the orings ? (The thread may be in constant contact with them.... )

Or do you reach a high level of tuning and the thread runs in the middle ?

Ricardo

 

[Clack]

I didn't notice any problem. Just runs the same, but speed is correct. The only thing to remember is to keep the knot as small as possible, so it will run quietly between the o rings not touching them. This of course would affect the homogeneity of speed.

 

[RCruz]

Can I use this with a premotec type AC motor ?

 

[Clack]

Sure you can

 

[Clack]

My TT has just the same motor

 

[RCruz]

I should expect some benefits in terms of attack and decay right... there is no flex in the belt..... but does it introduce some motor noise ?

 

[RCruz]

Looks like you are on your way....

Hi Fran

I found a 160VA 220 - 110v TX and decided to try it.

I just hooked the TT to the 110v winding, without any resisors.

As a matter of fact, the TT motor and cap+resistor are stock.

I am really amazed by the results:

The platter needs some pushing during startup but reaches 33rpm in less than 1 minute.

The mottor is now inaudible (I tried to hear it without lowering the pickup)

The benefits are a lower noise floor, better detail retrieval (now I hear high freq souns I did not realyse where there) and a better instrument diferentiation.

The TX gets hot so I believe this setup is not very echo...

Nevertheless the results are so good that I am planning to get a bigger TX (Toroid) and build a propper case.

is it possible to avoid the resistor just by choosing a 220 - 70v TX ?

Regards

Ricardo

 

[Nanook]

RCruz....

I know I'm not woodturner-fran, but....

What I would recommend is to adjust the resistor(s) until you get a nice combination of "start-up" time and reduced motor noise. You can always bypass the resistor for startup (perhaps with a momentary switch?).

There will be a "magic spot" where the motor noise is essentially the quietest, but it may not be at 70 volts. Once determined what the "magic number is" then shoot for a toroid with a similar (or slightly higher voltage) and use a minimum resistance to drop the voltage down to the final requirement.


stew

 

[RCruz]

Thank you Stew.

You made it totally clear.

I will try with some resistors and report the results.

I have been listening all weekend and this is really a major improvement.

Regards

Ricardo

 

[Nanook]

Ricardo...

as suggested, an often overlooked aspect of analog performance.

The toroid with a resistor network or variac is really the best solution.

I am happy you are enjoying the results.

stew

 

[RCruz]

Re: Ricardo...

I am happy you are enjoying the results.

Indeed........ This seems to be one of the major neglects.... I wonder what a DC motor should do here.

Now I will build a jfet RIAA and finally balance things with my highly modded CD53.

Ricardo

 

[Nanook]

balance things with your modded CD53?

I don't think so. The analog rig should absolutely kill your cd player....

stew

 

[RCruz]

Re: balance things with your modded CD53?

I don't think so. The analog rig should absolutely kill your cd player....

Hi Stew

I believe it is possible but not very easy.

My CDP has two clocks, 6 TX, 10 independent PSU´s 10 sregs and a jfet output stage.

It sounds so amazing that I really must do a carefull job on the RIAA so to get things even.

Maybe my SME3009 is not the best option for the Benz ACE I am using.... The mid and high freq are unbeatable but the bass needs some tightening.

Regards

Ricardo

 

[RCruz]

Hi Stew

You are right..... after the diy geddon and some upgrades on the RIAA, my TT is again beating the CDP in terms of speed and definition.

Soon I will have a Salas RIAA and then the TT will be king again.