How feasible is the prospect of using components from old hi-fi power amps for the basis for a guitar head? I scored an old Dynakit ST70 power amp and the matching preamp[ last year and will probably never get around to taking them to a tech for check up , etc. I would be interested in using the components for a guitar amp if the results would be worth it.... Just looking for some input regarding tone of the transformers these things used, etc. The ST70 came loaded with Mullard EL34s...bonus. Thanks for any advice.