24 November 2008

DIY 12AU7 Tube Preamplifier

This is Alan's mini-tube preamplifier.

12AU7 Tube Preamplifier Project
It is a very simple tube preamplifier project that will work with the 12AX7 or 12AU7 vacuum tubes, both of which are fairly common. The preamp is built using primarily parts that Alan had on hand. To make a real frugal build, the preamp can be built using 12V transformers and placed back-to-back in order to get the required high voltage and for the heater supply. Total costs for this project ran Alan about $30, with the majority of those costs going towards the enclosures and RCA jacks.

DIY 12AU7 Tube Preamp and Power Supply
The power supply is housed in a separate enclosure, also from Hammond. For full information, see the project page: DIY 12AU7 / 12AU7 Tube Preamplifier.

Related Tube Preamplifier Projects:

What's Playing:
Ingrid Michaelson - The Way I Am


  1. This is a cool project. I might have to build me one of these!

  2. Very good project that will appeal to many diyers esp because of the low cost. (I tend to have somewhat pricey projects. One thing I would suggest for your consideration is to use a type 5751tube in place of the 12A_7 bunch. It is pin identical. I have used the new manufacture Sovteks in a few projects and like the results. The parts values you have shown in the schematic will work with the tube. Good project

    Good listening