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Old 10th November 2012, 07:05 AM   #1
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Default Tank's DIY tube preamp

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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Click the image to open in full size.

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

so, what do you guys think? i did good? any suggestions for improvement?
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Old 10th November 2012, 10:29 AM   #2
SY is offline SY  United States
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Well, you're listening to Joni during one of her better periods, so there's not much room for improvement.
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Old 13th November 2012, 12:17 AM   #3
kevinkr is offline kevinkr  United States
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Moved to Tubes / Valves on the premise that this thread would get more visibility here..
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Old 13th November 2012, 10:57 AM   #4
freax is offline freax  Australia
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great work man! What size brass standoffs are you using, M3 or M2?
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Last edited by freax; 13th November 2012 at 10:59 AM.
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Old 13th November 2012, 02:31 PM   #5
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Originally Posted by freax View Post
great work man! What size brass standoffs are you using, M3 or M2?
i have no idea 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 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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