Transistor Preamplifier 1

Ad1. Typically u need only voltage follower output stage or u can hook a speaker transformer in your second stage instead load resistance and increase this stage current ampliffication to higher possible to achieve good eficiency. Thos two are the simpliest way. More complicated is to design complementary output power stage. Ad2. Sure youncan. It can be implemented in negative feedback loop and it is done such way. Or u can build separate stage between or as next in line composed as active filter. Good and simple tone controll involving treble and bass separate regulation is called bauxandall filter. It wasnwidely used some time ago. Ad3. Typically are two ways for level controll. Separate negative feedback loop where pot regulte srenght of this feedback. This is good way to make noise free attenuating of amp gain up to almost zero level. Simplest way is to add pot directly on input and attenuate signall input leaving amp gain same. This is not very god solution but s simple. Ad4. This is a river question. Can write whole book about this. Preamp you say. This is actually a preamp almost. Preamp typically shape input signall to make it match a standarized so called "line signal" at output. This is stndarizing to line input whose posses most of audio equipment. It mostly act s voltage amp only. You amp here is perfect to this role. Efdects and vintage sound. Saying about vintage sound. Vintage sound require vintage parts to perform it or implement digital equivalent formexample a tube emulator. U can also look after old point contact transistors and mak one of the first ever transistorised audio amps. (Beware any point contact transistor related schematic will never work when build modern transistor. It's impossible without heavy modiffication or even creating separate circuit from scratch.) Ppl reported very unique sound of this transistors so it is a worthy challenge. For tube sound u can look after audio specialized mosfet transistors. They posses the same distortion characteristics as tubes and produce tube sound almost perfectly and do not require change every 2000-3000 hours of operation due to cathode emmision wearing out. But also are not a 100 tubes so a real tube solution is also good option for example a tube power stage to your little voltage preamp u build here. That's all for now.

This circuit is going to need some modification, before it becomes a preamp. I'm sorry to say, the signal isn't even making it past the first transistor, intact.