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

Gain ~12db
Output = ~10V RMS
Input Impedance = ~40k
Output Impedance = ~650ohm

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

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

If you enjoyed this video and if you downloaded the build documents, please consider buying me a coffee. I would appreciate your support:
https://www.buymeacoffee.com/MikeFreda


Schematic: https://drive.google.com/file/d/16ies...
Chassis Layout: https://drive.google.com/file/d/1nLDQ...
Parts list: https://drive.google.com/file/d/1mEvg...
Close up pictures: https://drive.google.com/file/d/1Cx74...

Approximate cost to build = ~$150

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...

Tubes: https://www.thetubestore.com/preamp-t...
Capacitors: https://www.thetubestore.com/solen-fa...

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:    • MAKE a Cake Pan Light with MODS for v...  

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