Crazy custom amp idea

Hi guys,

I've been having another weird DIY idea in my head for a while now and I'd like to ask you whether you specialists think it's feasible.

Basically, I'd like to build an easily customisable "building block" amp, with a fixed power amp but with REPLACEABLE PREAMPS.

For example a 2 or 4-tube power amp before which one could fit various preamp clones, so you just switch between a Fender, Orange, Ampeg, Vox, Diezel etc... in reasonable-sized enclosures.

The advantage compared to simply having different heads would just be cheapness : I'd love to get into building loads of tube amps, but getting 2 transformers and power + rectifier tubes for every build can get pretty expensive pretty fast. This way, you could build amp clones without some of the tricky components. Of course, the power amp section being the same will affect the sound, but does it change it any bit as much as the preamp does?

Maybe this has even already been done! But I was wondering if it's doable, wattage-wise (I know slaving is common practice but does it work unconditionally?).

Thanks for thine help!

it exists, its the egnater/randall MTS modular amp system, look it up... discontinued, but a lot of fans including the smashing pumpkins

eganter designed it, and the rarer eganter version ash 2 channels per module so in a 3 channel amp chassis you get 6 channels, high and low gain voicings for each module.... randall is 1 voicing per module... and then there's the modders like salvation and jaded faith who tweak up existing modules to sound more like vintage amps or into never before heard configurations

if you are cool with preamp drive then its a good system... for me? I love some preamp gain bangers like the 800, soldanos etc, but my heart really belongs to old amps played loud as all fucking get out