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TU--H80 Hybrid Vacuum Tube Amplifier Kit                                                                    






TU-H80 is a compact stereo power amplifier kit using 12AX7 for the audio equipment 

This amplifier is equipped with a   LINE IN (RCA) jack and a 3.5mm mini jack.

The power source AC adapter can be used around the world with the appropriate plug adapter.

Optional  DAC (PS-3249) 


Hybrid Composition : Vacuum tube + Class D

Vacuun tube   12AX7  x 1
Rated output 5W +5W (when 8 Ω  speakers are used)
Input  sensitivity   140mV , 47kΩ(INPUT-1), 25mV, 2.2kΩ (INPUT-2)
Frequency response 

12-20kHz (when INPUT-1 is used); 30-22kHz (when INPUT-2 is used) 

Residual noise             95μV(IEC)
Suitable speaker 4-8Ω
Voltage DC 12V
AV adaptor AC100-240V, At maximum output (8Ω speaker):1.2A; (6Ω speaker) 1.65A
Dimension W125xH50xD165mm (including projections) Weight   400g


Optional DAC PS-3249 (sold separately)

Price $ 65.00




TU-H80 Modification

Although TU-H80 was not made for applying other options, there is a space where the PS-3429 can fit.

 It is easy to install it if a hole in the chassis aluminum panel is made, but a head of a screw protruding out of the aluminum panel surface is unsightly since the case is nice and smooth.

Therefore, you can affix it with a sponge-coated tape, but eventually this might come off and cause a short. Because of that, the solution is to fasten a screw without the head protruding. Drill a hole to the speaker terminal and then attached it. 

 It is only the following two types (four total pieces) of modification parts that you need to prepare.

*Small flat head (machine) screws M3×510 2

*Spacers with male and female screws M3×40(45) 2
In the image, four 10mm spacers to make 40mm are connected)

 (1) Paper pattern for drilling

 Click the image and print it out with no reduction or enlargement the size. If it doesn’t print to the actual size, please make reduce or enlarge to proper size.

(Resolution of the picture is set to 150dpi.)

 (In the above picture) Drill the holes marked in red to the SP terminal.

(2) Cut the paper pattern, place it on the speaker terminal and drill the holes

(In the above picture) Place the paper pattern like this because you will need to drill the holes on the side farthest from the flat terminal.

(3)To allow for mounting spacers and countersunk screws, prepare the perimeter of the hole.

 (In the above picture) After drilling, process the perimeter of the hole to be able to install countersunk screws and spacers.

 (4)Fix PS-3249 with spacers and countersunk screws, then attach it to H80’s rear panel.

(5)The wiring from the LINE output of PS-3249 is soldered to the terminal of H80s RCA jack. If it is connected as follows when you pull out from a jack it will change to USB-DAC automatically.

 (5) A USB terminal doesn’t come out on the panel. What shall I do?

I took an easy way here. I was able to buy reel-type mini BUSB cable at a $1 store, so I drew it out of the rear panel.

(In the above picture) Put a slit in the rear panel and feed a USB cable through the slit.

 After this, it will be done if H80 is set in an aluminum case as before.