Hi y’all,
I know it’s not very synth-y but Im building a 100 watt bass amp. The preamp section needs ±15v DC at <1A and the 100w power amp needs 12-24v DC. Id rather not have loads of power supply cables trailing out of the back and AC/AC adapters cost their weight in gold nowadays. Has anyone got any suggestions?
Thanks in advance,
Fin 
How much current do you need for the main amp? If not more than 2.5-3A you can probably get away with some combination of a “brick” SMPS with linear regulator and/or buck converters. The type of amp and preamp also matters for noise considerations. Is it a class A tube preamp? Class AB amp? Class D amp maybe?
Might be worth mentioning there is a design cliche with amps that you are “listening to the powersupply” so for example in the case of a bass amps that means huge capacitors so it can deal with the huge surges of energy needed for that application
Go for a kit if it’s your first amp. Ignore fluff about which power supply to use, it’s the pre and post amplification circuits that create the sound and their power requirements are fairly simple. There are several clone amp kits available.
Steer clear of valve designs for now as there is simply not enough space here to list the way they kill the uninitiated. Not kidding.
Keep us posted
Built a preamp (generic) and have gotten a 100W digital amp. The preamp has a rectifier/filter/regulator (+/-15V), the power amp needs …24VDC.
A simple 2x15VAC tranny will power the preamp and I have a 120VA 12V tranny for the power amp.
All will be housed in the speaker cabinet (15” bass driver + a massive horn tweeter (so I can use the box with guitars, keyboards and SYNTHS).
Another option is to use SMPS AC/DC psu. May or may not be noisy, bet simple to use.