Hello! I'm looking for a low voltage tube based preamp. I've search around the internet and found a few schematics but some of them are schematics of both the preamp and power amp sections and in some cases, I'm unsure of where the preamp ends and the power amp begins. I'm also looking for a no frills design, so something clean (as clean as can be hand under low voltage) and no tone shaping. Also, I'm working with 15V from an old power supply that I salvaged and would like to use.
So far, this is what my search has shown me:
Sopht amps - http://www.sophtamps.ca/mambo/index.php?option=com_content&task=view&id=25&Itemid=37
Soul-o-tube - http://www.avwz35.dsl.pipex.com/soul-o-tube.gif
Tube Cricket - http://www.beavisaudio.com/Projects/TubeCricket/TubeCricket_Final_2008.gif
So far, the sopht amp seems to be the best option since it uses tubes that are actually meant to be run at low voltages but I'm unsure where the preamp ends and the power amp starts. Does anyone have any experience with any of these circuits? And how would I go about modifying them to be clean and have no tone shaping.
My final option is to just go completely SS and do the fetzer valve but I'd really like to go with tubes (partly for the aesthetic value and partly for the challenge of learning how to work with tubes). I appreciate all the help you can offer! Thanks everyone!
So far, this is what my search has shown me:
Sopht amps - http://www.sophtamps.ca/mambo/index.php?option=com_content&task=view&id=25&Itemid=37
Soul-o-tube - http://www.avwz35.dsl.pipex.com/soul-o-tube.gif
Tube Cricket - http://www.beavisaudio.com/Projects/TubeCricket/TubeCricket_Final_2008.gif
So far, the sopht amp seems to be the best option since it uses tubes that are actually meant to be run at low voltages but I'm unsure where the preamp ends and the power amp starts. Does anyone have any experience with any of these circuits? And how would I go about modifying them to be clean and have no tone shaping.
My final option is to just go completely SS and do the fetzer valve but I'd really like to go with tubes (partly for the aesthetic value and partly for the challenge of learning how to work with tubes). I appreciate all the help you can offer! Thanks everyone!