ampSth - 2.1 hybrid amplifier with bluetooth and bt calls

Hello, so I needed a nicely sounding amplifier that would go with my 3d printed speakers. Lots of people seem to be happy enough with typical 2.1 TPA3116 amps. To me they sound too “mechanical” and don't get me wrong, they are great! In my opinion they are perfectly suited for electronical music. They lack in “warmth” department tho and here's the solution - tube preamp. This build requires some materials (listed below) and due to vacuum tubes physics you'll need 2 types of power AC and DC. The case also doesn't contain power sockets, I've used on wire connectors. Power supplies (2, one for AC and one for DC) live outside the case.

Warning - depending on your choice of power supply you may need to work with power mains and I don't take liability for damages, death and so on. 

Parts needed:

1. “chinese" TPA3116D2 2.1 D class amplifier
2. “chinese” 6J1 stereo tube preamp
3. LN-BT02 v3.0 bluetooth module
4. 12v DC suited for the point 1 amplifier (somewhere around 15A) it will also power BT module
5. 12v AC suited for point  2 amplifier (usually 0.8A)
6. 12-14 M3 screws (depends on the legs setup). I've use 4mm long ones. Designed in a way that allows various lengths.
7. Wires to connect everything together. BT module comes with wires, so you'll need to connect preamp with amp. That's 3 speaker wires, couple centimeters.

How to print:

Everything should be printable without supports. There are some rather big bridges so I'd rather recommend good cooling. If you prefer to print with supports - no biggie. Everything that might need support lives inside the case so you'll not loose on quality.

I've printed it with black rPLA.

You'll need body and top. Rest is optional. I've used legs only on front to tilt everything a bit towards me when I'm working. There are holes at the back to fit back legs as well. Clips are supposed to hold cover and body together. It works fine without them but it's not held together by anything, hence the clips if you need that. I didn't want visible screws so top doesn't have screw holes.

Assembly:

1. Insert BT module at the lowest shelf (right side). Screw it on, attach wires. You'll need input wire and 12v power wire (both come in package). 
2. Insert microphone into hole (front wall, center top) and connect to the module.
3. Feed 12V DC through back hole (long rectangle) screw it to the TPA amp along with 12V input for BT module. I highly recommend using some kind of crimping connectors. I've used insulated cord pins. 
4. Insert TPA into the left shelf and screw it down.
5. Feed 12V AC through back hole and solder it to the tube amp. 
6. More soldering - solder BT output wire to the preamp input
7. And more soldering Solder preamp output to TPA input. Here you can use 3 pin cable supplied with BT module which is not needed in our setup. That way you have to solder only preamp output and 3pin goes into input 3pin socket in TPA
8. Insert preamp to the highest shelf (right side) and screw it down.
9. Feed speaker wires through the back hole and screw them down to the TPA amp.
10. Put the top cover on top

legs are simply screwed to the base. Clips just go on the sides (notice that one is shorter, you'll figure it out)

Voila. Enjoy quality music.