I bought this "Starmaker 8015" combo to use the cabinet for my first diy build. I got it for 10€ and assumed it is just some asian made department store crap - although the cab looked very well made. Now I opened it up and see that there are almost only british made components inside; the jacks are original cliff, the switch is a swann 51 (jcm800 style) and the speaker a Celestion G10-20!
The pots are RadiOhm and the electrolytic caps are made in Japan.
It also sounds very nice, if you don't dial in too much bass, this is a clean only amp, there is no distortion circuit.
So has anyone ever heard about this amps? And where they were offered in the 80s? Google only shows me some classifieds where these amps were offered, but mostly in (eastern-) european countries.

Thanks Phil, yes, Teemu's book is really a treasure for the fact that it is free. I also try to get inspiration from the schematics of the 80s Marshall, Peavey and Lab Series ss amps, but the often use now obsolete components.
My main amp is a Vox AC30, so I don't depend on the builds I'm trying to make, they would be just some grab&go gimmicks - as long as there tubes available.
Breadboards are a good idea, I have them for Arduino stuff, but I didn't think yet of using them for the audio circuits  .

Thanks for your suggestions. The drive55 is basically a Fender 5e3 Tweed Deluxe in a box (Catalinbread Formula 55 clone), it has a hi/lo gain switch so it can be also played clean - so it should also count as a preamp pedal. A tonestack is also integrated. So if just the output could be an issue, couldn't I just build a little gain stage (j-fet or opamp) on a perfboard and put it in between? Or somehow beef up the last gain stage on the drive55?

Hello there,
my name is Martin and I joined here because I have this design idea, and I bet there will be more to come after that. Although I'm an electrics/electronics professional, my knowledge is more about energy distribution, generation and sensors/actors. So I'm not necessarily an expert in signal processing, that's where this forum comes into play.
I have this vision to make a small practice amp, where I use a Drive55 pedal pcb as a preamp and the Vellemann K4001(TDA2003) as the power amp. This will be built into a combo cabinet with a 10" speaker. For the power supply I would like to use a toroidal transformer (2x 6V/1,25A secondary, can be bridged).
My first question is, how do put this all together, what is additionally needed impedance-wise between the modules and modifications on the Vellemann board?

Components links:

https://docs.pedalpcb.com/project/PedalPCB-Drive55.pdf

https://cdn.velleman.eu/downloads/0/illustrated/illustrated_assembly_manual_k4001.pdf