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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.

http://i.imgur.com/JE8FAeKh.jpg

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

http://i.imgur.com/SjJaAr2h.jpg

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

http://i.imgur.com/aEvTYDEh.jpg

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

http://i.imgur.com/fSDnfTSh.jpg

First holes drilled:

http://i.imgur.com/NTCrp0ah.jpg

http://i.imgur.com/wrkMnyph.jpg

http://i.imgur.com/kXwqn45h.jpg

 Tube sockets done:

http://i.imgur.com/xUcachfh.jpg

Chassis installation screw holes done

http://i.imgur.com/1JB48Vhh.jpg

All the necessary drillings and openings in the chassis done:

http://i.imgur.com/YtPh5Dph.jpg

http://i.imgur.com/yIM9rH6h.jpg

Tube socket for 12AX7 in place

http://i.imgur.com/zs6zjMmh.jpg

Tube socket for 6V6GT in place

http://i.imgur.com/rmDytQth.jpg 

Input and speaker out from the inside

http://i.imgur.com/qDv1NBmh.jpg

 This is how it looks like after 3 hours

http://i.imgur.com/X69li96h.jpg

View from the inside

http://i.imgur.com/jnMrozGh.jpg

 

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.