XH-A201 6J1 CLASS A, Bile Tube Preamplifier Housing Assembly & Test

Fast glass assembly process of XHA201 Bile tube preamplifier, connection on the Douk Audio Tone amp and first sound test. Test volume up to distorsion. Please left some comments below to share more useful data of this preamp and what are your experiences with.
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[@lammatt]

I got one from a Chinese seller for us$5.5 (AC-AC Adapter included) Looking at your board layout, I am quite sure it is the same one as this in the video. But mine is with sanyo's electrolytic caps and the 10uF ones are those tiny ceramic caps

[@boblaws7582]

Would like to see what other devices you connected the Bile Tube Pre-amplifier up to.

[@christiancortez4982]

Beauty

[@muriktechnicalacchile981]

Hello friend with this preamplifier can I preamplify my Turntables in aux or phono?

[@dogsauce19]

recommend a transformer to power both this and a TDA2050 amp through an ac to dc buck converter?

[@truths2357]

Good....

[@marksearl1745]

What's the music?

[@upside-down6211]

Can i use 12vac to 12vdc rectifier to use with battery?

[@jimmitchell8357]

I am designing a cabinet looking case for these. I used mine for a guitar preamp and while still playing with that, the case is coming a long nicely. I don't want to come off as a bot but if anyone is interested in it I would be interested in confirming measurements with similar units by different manufacturers - message me and I will share my blog post.

[@christiancortez4982]

Nice 👌🏻

[@vinczejani]

the tube has no role apart of the blue led inside.

[@digitalnomadx9212]

Why are there no bass and treble controls on this one..🤔🤔

[@YO9DOC]

ask china seller :))

[@elyserva7903]

What power adapter to use on this? The specs says 12volts ‘AC’! All I have is a 12volts DC adapter.

[@als-techreview]

It should be AC if there is labeld like that.. Other way will not work properly.. Well I try mine on 12V DC now and it' s working.. But I is some noise be heared in the background.. Probably will not be ok on longer term..

[@elyserva7903]

ALS-TechReview I guess I’ll just use a 220v~12v, 1amp transformer that cost $3 online. Hope it won’t emit some nasty smoke! 🤞😄😄😄

[@als-techreview]

@@elyserva7903 hahaha.. You are the legend! I wish you luck 👍😁🤞 don't burn it 😁

[@elyserva7903]

ALS-TechReview 😄😄 with a little research I just found out that you really need to use a transformer, not an AC-DC adapter. 👍

[@lammatt]

It takes AC input There is a 4-diode full bridge rectifier in the curcuit

[@cx3262]

maybe better with other tubes

[@narabdela]

Well, the first 4 mins 20 secs was interesting. The rest was an amateurish waste of time accompanied by excruciatingly unlistenable music..

[@antoniov644]

AGREE!!! I HAVE THIS UNIT, I USE A DOOR BELL TRANSFORMER, THE FIRTS WEEK OF USE, IT WASN'T GOOD, AFTER THAT WEEK, IT STARTED TO SOUND BETTER, AFTER 15 DAYS OF CONSTANT USE, IT SOUNDS REALLY GOOD. I THOUGHT TUBES WEREN'T FOR ME... NOW, IM LOOKING INTO GETTING ANOTHER ONE WITH A TPA3255 AMP. MAYBE A SCHIIT BRAND.

[@pook6212]

LOSE that horrible "music" NOISE!!!!!!!!!!