I've got a really old challenger ch30 amplifier that is in good working order. Can it be rewired into a guitar amp using the same tubes/transformers etc. I can get new caps and resistors at radio shack if need be.
The easiest way to use a PA amp as a guitar amplifier is to simply get either a pre-amp (you can make one yourself if you'd like to save some money), or a good EQ pedal to put in front of it.
*find what components you already have and want to reuse (ie, your tubes and transformers)
*find a brand or model of another amplifier that contains roughly the combination of what you have/want (try Bogner!)
*go to the maker's website and search for schematics - for example, if you go to Fender's website, you can find the schematics for every product they ever made. 90% of the time, you can find them.
You aren't going to find many tutorials on how to convert an old Bogen to a guitar amp. Any tutorial that you find is basically going to say what I did above.
By the way, don't buy components at Radio Shack...they are REALLY expensive and of pretty poor quality. Try www.jameco.com , they are load cheaper and have much better quality stuff.
Oh, one last HUGE bit of info - you need to make absolutely sure that the transformers and tubes you are using are compatible with the circuit you are creating. If you don't, you could very easily start your amp (and house) on fire.
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