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Ok guys, this is for the people that would like an out the box challenge. I see in the above mentioned youtube vid that they push +3v thru the tube. on a low voltage like that, wont the current be lower to? They run that pre amp from a battery yes, but to the gurus out there, +48 phantom down...

Awesome guys! shot. ill  b building away.

im really diggin on your profile pic!

i like simple..... care to share?

im looking for an inexpensive low voltage tube preamp to warm up the acoustic guitar without going farty on the low ends. go on youtube and listen to the takamine cooltube demo, mmmmmmmmmmmmmm love it. http://www.youtube.com/watch?v=RSV5IQ2xNqk

How about a separate battery for current? mmmm, i guess i wont really get away from using an external power supply in an external unit. but tube it must be for them sweet harmonic overtones. takamine has a cool 12au7 built in preamp that runs on 3v, man you must hear those demo's. but alas, no...

Hi everybody, im new here and also green in the electronics field, however i think im onto something. would it be possible to build a preamp for an acoustic guitar using the 48v phantom power supply from the desk to power a 12au7 tube? im looking to breathe life into the bluuuaaeggg sound the...

Thanx, you saved me some time there.

Does anyone have a good clean schematic for a headphone amp that can take up to 8 headphones? Preferably with volume control on each channel. (for a beginner)