• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Tank's DIY tube preamp

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Hey guys.

a few weeks ago i posted here, questioning the quality of the ebay tube preamp kits.. and the results were mixed. after much contemplation i decided to give one of those kits a go after reading some good review about it - and im super happy i did so!!

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This kit is a a super simple buffer tube preamp board with a 50k pot, and it also came with a transformer. the kit uses two 6n3 tubes, which were also suplied. after listening to it for a while i decided to give it a proper enclosure - and this is the result:

when i first approached this project, it was important for me to not just build a simple enclosure based on existing designs, but rather start from scratch on try to thing both on the looks but also on the manufacturing process - keeping it as simple as possible.

first of, i started with the three aluminum sheets. i marked everthing out, and made the first cuts in the board:

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the next step was preparing all the wiring:

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then i took things to my schools workshop for the building of the enclosure itself:

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once all the holes were made, the wood was varnished and the welding began:

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and once everything was hooked up:

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at this point im 99 percent done, and other then a small shielding problem in the selector switch (which i will attend to shortly) everthing works great, and the sound is exactly what i was looking for when i first decided i want a tube preamp! bang for buck - this is one of the best deals i did in the audio world :D

so, what do you guys think? i did good? any suggestions for improvement?
 
great work man! What size brass standoffs are you using, M3 or M2?

i have no idea :confused: im assuming you are reffering to the little legs that hold the circuit to the board (and i may be wrong..) - i just used those i found in an old misc screws box my dad had :p i actually planned to change them because i want the board to sit higher up so the tubes will stick out more.
 
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