Tube amp designe for Mic/Acoustic guitar

[athos56]

So I'm thinking about building a tube amp for a friend, he sings and plays acoustic guitar in small venues, homes/coffee shops/small gig type places. I have built small electric guitar amps (Champ style amps), and kt-88 high-fi amps, hybrid SS/tube amps etc... I'm thinking of something around 10 to 20 watts (6L6, EL34, something else maybe??) Ideally, it would have 2 channels, 1 mic, 1 guitar, master volume, tone control. I'm thinking of making it just a head. So I've never made a mic section and am not exactly sure about the amp section for the acoustic guitar. In pictures of him playing there is a 1/4 wire coming out the back of his guitar, but I don't think it is a plezioelectric pickup.

Does anybody know of a schematic for an amp I can work from? Thanks

[unclejed613]

can't really tell you much without knowing whether that's a piezo or not. what type of pickup or microphone determines what input impedance and gain you need for the first stage of the preamp. if it's a piezo, there can't be a whole lot of input capacitance either.

[Nigel Goodwin]

As it's for acoustic guitar and vocals, I would suggest you should be looking at the higher quality of a transistor or IC amplifier, presumably he's not wanting the distortion, noise, and poor frequency response a valve amp gives.

As for the mike in his guitar, most use electret mikes with their own preamp and battery in the guitar body.