[der luda]

Now bx 4 is ready, 2 x Burson V5i installed.
All solder joints checked, the circuit board, tube insulated with polyimide.
Battery, housing insulated with copper.
No noise caused by LTE / WiFi

Directly on the Galaxy S8, I have now burned in a few days with the Hifiman Edition S (current around 149.-).
This is an interesting combination, sounds pretty good, I'm not sure yet ...
It is probably so much fun because it was made by myself

 

[Whitigir]

Hey all in the process of modding mine..went the miniature socket route so rolling tubes wont be such a PITA..

Waiting on some more parts to finish up.got some sylvanias in at the moment...

Does none know where to buy these sockets

 

[ledzep]

Does none know where to buy these sockets

Try mouser Rs or digikey

 

[Whitigir]

And have any one been tube rolling ? What kind of tubes will be a replacement for it ?

 

[fabien32]

Does none know where to buy these sockets

I think it is custom made, not for the public

 

[Joseph Lin]

Hey all in the process of modding mine..went the miniature socket route so rolling tubes wont be such a PITA..

Waiting on some more parts to finish up.got some sylvanias in at the moment...

Where did you get those green rings around tube? Does it reduce the ringing?

 

[kakaworu]

Where did you get those green rings around tube? Does it reduce the ringing?

They look like castration bands for goats.

 

[Inju]

I just wanted to say. I just picked one of these up and it's fantastic. Definitely gives me a tube sound but is very dependent on my source. Using my Note 10 Lite headphone out it is noisy and buzzez and beeps. Using my Alienware M17 headphone out it is noise free and very, very clean. I'm pairing this with the Fiio BTR3K which I just ordered and will report back in. I'm liking this more then my Little Dot MK 3 I've had for 8 years.

 

[fabien32]

but is very dependent

But of course, if the source is crappy you amplify crap

 

[Joseph Lin]

I just wanted to say. I just picked one of these up and it's fantastic. Definitely gives me a tube sound but is very dependent on my source. Using my Note 10 Lite headphone out it is noisy and buzzez and beeps. Using my Alienware M17 headphone out it is noise free and very, very clean. I'm pairing this with the Fiio BTR3K which I just ordered and will report back in. I'm liking this more then my Little Dot MK 3 I've had for 8 years.

Yeah, cell phones have strong Magnetic interference and B4 is weak in blocking interference so..

 

[Inju]

With the Fiio BTR3K I'm in love. The Little Bear is very warm with my HiFi-Man HE-4XX streaming APTX. The magnetic/electronic shielding is horrible on these and if it's close to my phone it will buzz. Thus the bluetooth amp/dac module combo. The rubber bands that come with the Little Bear are perfect for the clip on the Fiio BTR3K. I'll get my HD6XX and report later as well.

 

[Inju]

Oh just as an aside my Note 10 Lite streams LDAC! My Alienware M17 does APTX. I love how the BTR3K changes color and lets me know.

 

[Onik]

The B4-X SUCKS imo, because I experienced slight hiss from every high end Headphones I ever tried from Hd650/ATH-R70X to BEYERDYNAMIC T1( 600 ohm), I miss the Old Original B4 which was my favourite the X labelled for balanced out LOL tried my HD650 with balanced cable still experienced slight hiss, this amp was very badly engineered, a portable tube amp should have have pitch black background when using high impedance cans!

Also when it comes to balanced out it doesn't make any sense because you are using single ended inputs and no balanced inputs which could make lot of sense just like Loxjie P20!(balanced in balanced out)

Now I'm thinking to sell this trash and buy the original B4 again.!

 

[Inju]

Mine are dead silent. Just tried them with my HD6XX and it's fantastic for me. I have no hiss and really love this combo! For $99 a no brainier for me. I love this hobby and just kicking back listening to music.

 

[Onik]

Mine are dead silent. Just tried them with my HD6XX and it's fantastic for me. I have no hiss and really love this combo! For $99 a no brainier for me. I love this hobby and just kicking back listening to music.

Be in a real quite room, and then plug your hd6xx slowly in and out and let me know if you hear slight hiss, if you can't then maybe your B4 X is better than mine. You know it's a Chinese trash so it's never perfect, probably my ones has build quality issues that's what causing the hiss. but Fxxx it I'm gonna sell it and buy the B4.