Making a 12AU7 Line stage in a military style chassis // Tube stereo preamp build.

Scratch building a military looking vacuum tube preamp that I will use for a shop stereo system.

Specs:

2 - 12AU7 9 Pin twin triode tubes
1 - 0D3 150v Regulator tube
Power Transformer: Hammond 290WX @ 27mA DC & 6.6v @ 1.05amps

The circuit shown is a mixture of topologies that I have built over the years. It is not unique and few will notice similarities between various circuits posted in tube literature and various DIY Forum/Communities. I do not assume any ownership of this circuit. This is posted for hobby use only. Feel free to copy, adjust and modify.

Valve Amplifiers - Morgan Jones - https://amzn.to/43wQjNc

Hakko Solder Station: https://amzn.to/3PvQaD7
Kester Solder: https://amzn.to/3aJKNBI

Schematic: https://drive.google.com/file/d/16iesS8iB6hF-k803boxhwOqC1ZNEsO28/view?usp=sharing
Chassis Layout: https://drive.google.com/file/d/1nLDQNuIYhMTTeXnJJ2vKHeSKoPbSoXj0/view?usp=sharing
Parts list: https://drive.google.com/file/d/1mEvgZyfquZcx7FG3fK9tefAulL8JXF1y/view?usp=sharing
Close up pictures: https://drive.google.com/file/d/1Cx74Js3rX66W1gUZ2VdBuA75lN1rn2ZP/view?usp=sharing

If you find there is too much gain or you would like to use more sweep of the gain knob, you can add some more attenuation: https://www.goldpt.com/preattenuation.html

Tubes: https://www.thetubestore.com/preamp-tubes/12au7-ecc82-tube-types
Capacitors: https://www.thetubestore.com/solen-fast-cap-3-3uf-630v

WARNING: Tube amplifiers contain very high and potentially lethal voltages!
Drain all filter caps and check voltages before commencing work.

0:00 Intro
3:00 Building the chassis
9:08 labeling the front panel
11:08 Wiring
14:30 Testing
16:53 Layout
18:40 Final ramblings
19:52 The glow

Camera:
Canon M50
iPhone 11
Boya By-M1 Lavaliere Mic
Amp mic'd: Rode VideoMicro

Lighting:
Aputure Amaran AL-M9
Neewer 26" Soft Box
DIY Cake Pan Light: https://www.youtube.com/watch?v=DxlgxDP_aes

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