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Current best DIY preamp? - diyAudio
https://www.diyaudio.com/community/threads/current-best-diy-preamp.308130/
I build a MTA preamp from Linear Audio Vol. 6. I tried with both PCL84 and PLC200 and the amp is very stable. super band width and super low THD% sounds like a cable with gain. if you need no gain go for a Autoformer like intact audio. best regards.
4S Universal Preamplifier for 12A*7 Tubes - DIY AUDIO …
https://diyaudioprojects.com/Tubes/Universal-Tube-Preamplifier/
Matt describes the design and construction of the 4S Universal Tube Preamplifier. The 4S Universal preamp is a super simple single stage line level Hi-Fi preamplifier that will work with any of the 9-pin miniature 12A*7 twin triode tubes (12AU7 12AV7 12AY7 12AT7/12AZ7 12AX7). You can change tubes to vary the preamplifier gain.
DIY Vacuum Tube (Valve) Amplifier Projects - Hi-Fi Audio
https://diyaudioprojects.com/Tubes/tubes.htm
12AX7 Tube (valve) Preamplifier Kit - DIY AUDIO PROJECTS
https://diyaudioprojects.com/Tubes/12AX7_Preamp/
12AX7 Valve Preamp Kit. The preamp kit is based around a common 12AX7 dual triode. The line level (Hi-Fi) version of the kit has the gain set at 4 (6 dB). What makes this kit very inexpensive is that power comes a switch mode power supply, fed from a 17 volt DC wall wart! Photograph 01 shows a stock build of the kit.
DIY 12AX7 Tube Preamplifier Kit - DIY Audio Projects Photo ...
https://diyaudioprojects.com/Gallery/displayimage.php?album=1&pid=119
DIY 12AX7 Tube Preamplifier Kit This is my build of the Silicon Chip Magazine 12AX7 DIY Tube Preamplifier Kit. All of the coupling capacitors were upgraded to Auricaps. The volume control is an ALPS pot from Radio Shack
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