My first participation here. I bought the PJ Tube Box S2.
I am very satisfied with the sound.
I use it with Denon DL 103 Moving Coil for the "mint" vinyls and with Ortofón 2M Red for the rest.
Just add that apart from a very wise comment here (post 8,9 and 14) I have not noticed in any "serious" review a detail that seems important to me:
It gets too hot!
Being a design with the 12AX7 tubes submerged inside the casing up to 1/3 of its height, the part corresponding to the filaments is located inside the cabinet. And they are the ones that heat the tubes at the bottom.
The valve holes are approx 2mm. with a diameter greater than them, it is insufficient, the heat that remains trapped inside the cabinet is greater than that which is dissipated from above.
There should be a number of extra holes around it, much like the power tubes on many vacuum tube amps.
One of the risks - apart from the longevity of all the components -, which I see as the main drawback due to this excess temperature, is that there are two polystyrene capacitors very close to the tubes, as they have already mentioned in posts 8,9 and 14.
These types of capacitors are very prone to change in value when they exceed the limit of 75 degrees Centígrados, and do not return to their original value when cooling ...
My unit came from the factory with both caps sloped, away from the tubes. I guess it must be for something. I have already decided to use it "without any clothes", (it is spring and summer is approaching here) although it is not very aesthetic. A flannel ensures that it does not get dust .....
WAF from Project Tube Box S2 is very poor when "clothed", so unclothed is a NO NO NO. But in my case, luckily, they let me do it. It's just that my wife and I are old enough to worry about the impression the visitors get.
Greetings
P.S:
I don't speak English, so Google Translate is my great friend.
I am very satisfied with the sound.
I use it with Denon DL 103 Moving Coil for the "mint" vinyls and with Ortofón 2M Red for the rest.
Just add that apart from a very wise comment here (post 8,9 and 14) I have not noticed in any "serious" review a detail that seems important to me:
It gets too hot!
Being a design with the 12AX7 tubes submerged inside the casing up to 1/3 of its height, the part corresponding to the filaments is located inside the cabinet. And they are the ones that heat the tubes at the bottom.
The valve holes are approx 2mm. with a diameter greater than them, it is insufficient, the heat that remains trapped inside the cabinet is greater than that which is dissipated from above.
There should be a number of extra holes around it, much like the power tubes on many vacuum tube amps.
One of the risks - apart from the longevity of all the components -, which I see as the main drawback due to this excess temperature, is that there are two polystyrene capacitors very close to the tubes, as they have already mentioned in posts 8,9 and 14.
These types of capacitors are very prone to change in value when they exceed the limit of 75 degrees Centígrados, and do not return to their original value when cooling ...
My unit came from the factory with both caps sloped, away from the tubes. I guess it must be for something. I have already decided to use it "without any clothes", (it is spring and summer is approaching here) although it is not very aesthetic. A flannel ensures that it does not get dust .....
WAF from Project Tube Box S2 is very poor when "clothed", so unclothed is a NO NO NO. But in my case, luckily, they let me do it. It's just that my wife and I are old enough to worry about the impression the visitors get.
Greetings
P.S:
I don't speak English, so Google Translate is my great friend.
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