Sound from my turntable is veiled (like behind a curtain)

@roberjerman I cleaned the stylus with little bit of isopropyl alcool, on a tiny paintbrush, and guess what, the sound came back.  Thanks.  I will put cleaning the stylus on my weekly schedule, right after I take out the garbages :).

@yogiboy  This device looks interesting, I will read on it, and see if I can listen to it locally.   Thanks.   On the Toshiba, you would be surprised of what it can deliver, I also have a tuner on it, and my friends are always surprised when I tell them they listen to the radio.

Did you set up your table, arm, cartridge by yourself or did you have it done by an expert?

I ask this because when I replaced my Dynavector MC with a new updated version and had it set up by a guy with diagnostic equipment who could truly optimize it the improvement in all areas of sound quality have been remarkable.

 Be very careful about putting pure alcohol directly onto your stylus. Alcohol may dissolve the glue that holds the stylus to the cantilever, and soon you will be playing LPs with a cantilever and no stylus. Styllast ,the company, makes products specifically designed to clean styli. You could buy a bottle of stylast very cheaply. Also there are other products like magic eraser and ultrasonic cleaners That do a good job cleaning a stylus. But alcohol is a nono.

Toshiba almost certainly needs maintenance if it’s from the 70s or 80s.  Your own report should tell you that at the very least the switches are dirty and probably also the volume controls. That is why you are occasionally losing the output from one channel or the other. That alone could cause the sound to be veiled. But having said all that I agree with others that there are any number of modern inexpensive outboard phono stages that would probably be superior to the Toshiba, even if the Toshiba is working 100%. 

+1 ggagnon! I clean the styli on my cartridges after every side. I have used isoprophanol on the Discwasher brush for decades without any damage! The use of a cleaner from AT or LAST is a good recommendation! Before playing a side I like to apply a lubricant (Stylast). Claimed to reduce wear on the diamond stylus!

@hifiman5 The setup of the table was done by a professional.  The store where I bought my cartridge.

@lewm and @roberjerman I will definitely look for a solution to clean the styli more often.

I am convinced now to find a good phono stage, any recommendation will be appreciated, knowing my cartridge is and MC High Output.

Thank you all for you answers.