Instructables has very limited information on headphone tube amplifiers. So I have decided to help fill the gap and hopefully inspire some other builders and audiophiles. The build I have chosen is the “Millett Starving Student Hybrid Tube Amp”. Reasons being, it’s cheap (can be easily done for less than $125 for all materials except tools), sounds great, has a simple circuit and has an almost cult like following. Online support for this amp is huge, which makes questions and troubleshooting a lot easier.
There is a surplus of information about the schematic and how to wire the circuit online. So I will attempt to give you the resources about the building process excluding the schematic.
I would like to thank Pete Millett for his development of this amp and schematic. He is a brilliant and generous man and deserves credit.
Pete Millett’s original post:
Bill of Materials:
Step 1: Picking your components.
Now lets look at materials. Here is the standard Bill Of Materials (BOM).
My amplifier uses the exact same electrical components as above. However, I wanted to go above and beyond for sourcing an enclosure, heat sink, tubes and other materials not involved in the electronics. It was important for me to achieve an overall look that fit my tastes.
While looking at pictures, I became increasingly unimpressed and decided that there had to be a better enclosure option out there. After much distress I found what I finally was looking for. Hammond makes an enclosure designed for DIY guitar pedals that’s already polyester powder painted! It’s perfect. I then moved onto the heat sink and found one that fit the bill. Finally some awesome classic switches, aluminum milled knob and some sweet input/out connectors.
Heat Sink Mounting Grommet:
This site has some cool connectors and tube sockets: