The more I do, the happier I am! MBL preamplifier + 3886 + ultra-small chassis combination

MBL preamplifier + 3886 + ultra-small chassis combination!

I'm addicted to making machines. I play with them after I make them, sell them after they're done, and make them again after they're sold. There's no end to this life...

Machines in service:

The box is 220×50×180, which is a bit small, so you have to plan what to put in it.

PCB diagram:

The power board and MBL preamplifier are both made of perforated boards, which can save some space. However, this board is made of 4 small boards, 502 glue + solder + copper wire, it is very strong!

First arrange the positions of the holes. Drilling holes and processing on the chassis are the most difficult. The heat sink was originally too high, so I had to use a jigsaw to cut off a few centimeters.

Although the sparrow is small, it has all the organs.

I am quite satisfied with the result. First of all, the installation position is very accurate, just as expected, there were no unexpected problems during the process, and the installation is very firm, giving a very real and reliable feeling.

Finally, let's talk about the sound: 1. There is no noise, which proves that the R transformer has no magnetic leakage. The length of all dual-channel cables is completely symmetrical and as short as possible. 2. The overall effect is not as good as the two pairs of tubes I installed in parallel. The high frequency is slightly darker and the low frequency is slightly slower, but the power is still there. However, the mid-frequency is still good, very magnetic and airy. 3. The sound is relatively soft, suitable for listening to vocals and relaxing music.

After being turned on for 5 or 6 hours, the heat dissipation is average due to the small case. When it is turned on at 12 o'clock, the temperature of the outer shell remains at around 50 degrees, which can be said to be quite hot.