DIY Tube amplifier part 2

A few weeks ago I wrote about a workshop “Build your own tube amplifier”

Today was the first “hands-on” meet where we started to build the chassis for the amplifier components.

Keep in mind that the last time I did something similar was 11-12 years ago, so my skills have become very rusty and eye judgment isn’t the best anymore. However, as long as the thing does what it is supposed to do and does not break, I don’t care.

To begin building an amplifier, the first thing to do is to place all the components to the chassis to get an overview what goes where and how much space is needed.


After that the drilling holes and places for tubes, transformers etc are drawn on the chassis.


The big circle is where the power transformer goes. The two smaller circles are places for the tubes. Back on the right the installation hole markings for the output transformer can be seen together with the places to lead the wiring through the chassis.

The front panel will host from the left: fuse, on/off switch, indicator, tone control, volume control and the input

 Also if building a combo amp, then the places for installing the chassis to the cabinet are needed


This is the best tool to punch small dings for more precise drilling


First holes drilled:




 Tube sockets done:


Chassis installation screw holes done


All the necessary drillings and openings in the chassis done:



Tube socket for 12AX7 in place


Tube socket for 6V6GT in place


Input and speaker out from the inside


 This is how it looks like after 3 hours


View from the inside



What I could have done differently is that I left too 5-10mm too little space between the input and the volume control. This could make the installation of the wires there a bit difficult, but the supervisor thought it should be still OK. We’ll see.

The next session will already be about soldering the first electronic components to place.