When I was in my early teens
Ajax swing kit
Satellite LP copy
15w JHS practice amp
Yamaha PSS 480 (I think)
When I got into synths a few years later
Korg Poly 61
Crumar Trilogy
Yamaha RM1X
Cassette portastudio (the make escapes me but it’s wasn’t one of the usual suspects)
Alesis SR16
Guitar-based band stuff aside, my first electronic experiments were created with:
Yamaha SU-10 sampler
Yamaha NS-10 monitors
Boss DR-550 drum machine
DOD Grunge distortion pedal
Tascam Portastudio 414 mkii
Yeah, I was into digital hardcore, hehe
“Back in the day” was under a decade ago for me, as far as electronic music but:
Roland SH-09
Circuit bent RX-17 & SK-1
Roland RE-150
Ensoniq ESQ-1
Tascam 488
Probably the least cohesive decent set up ever. SH-09 is only thing still in use. The circuit bent stuff is stored away the rest has changed hands.
Peter your starting rig was dope as hell!!
Macbook, cracked logic pro 7, yamaha interface and my trusty 72 telecaster custom 
i started with a tr808, oberheim xpander and a shitty amp. I sat on that set up for a couple of years actually - *edit I guess I had a sequencer too. Was one of the future retro sequencers.
The RX21 was in no way “dope”, nor the little mixer.! I let the Pro-1 go when I emigrated but the CZ-101 stayed with me for nearly 30 years before I donated it.
Ahaha well the 21 is what it is but the 101 and pro one are a potent combo. Very dope!!
Korg Wavestation
Soundcraft Spirit Folio
Roland Alpha Juno 2
Alesis Quadraverb
Boss Dr660
But in 1987, 6 years before the above setup, I had 2 Technics 1200s and a Phonic MRT60 mixer, that my brother and dad had bought me. I was a very lucky 14 year old.
Electribe MX, Electribe SX, MicroKorg, Mackie 802 and a cheap M-Audio interface
Atari ST 1040 + Cubase
Akai s2000
Mackie 1604
Alesis Quadraverb
A Yamaha Keyboard with MIDI Out
A PC with a M-Audio Delta 44, M-Audio Oxygen 8, and some version of Cakewalk
Akai S2000
Yamaha SU-200
Waldorf MicroQ
Alesis Ineko
Definitely had Rebirth and maybe some cracked softsynths on there as well…
SL1200s followed by a Yamaha FX550 .
Then progressed to a synth - Novation Bass Station and Tascam 424 porta
Wow rocking it.
Topped off with Amiga 1200 OctaMed.
Things ain’t that different now lol, except I have more gear than I could ever possibly use.
Keyboard and synth-wise … 
Yamaha Clavinova (a keyboard was needed)
Korg MS20 + MS50 (no Midi, but real Synths)
Korg M3R (because M1 was way too expensive)
Kawai Q80 (sequencer with floppy disk)
Simple mixer (forgot what it was, very basic thing from an electronics shop) and headphones
Love the idea of this topic !
SP 303
JX 3P
Korg Delta
Korg ER 1
Sonic foundry Acid (software)
I started with Rebirth and Reason way back in the early 2000s, but if we are talking about the first 5 pieces of hardware I had.
Tascam US-122 interface
Roland XP-50
M-Audio Trigger Finger
M-Audio BX5a monitors (still have)
Beyerdynamic DT770 pro (still have)
Not very exciting list as I was mostly in the box. It all changed when I received a Korg EMX1 in 2016. That marked the beginning of my out of the box transition.
In the early 1980’s I had a Teisco 110F (Hot Chip now use them)
I dreamt of a Fairlight CM
Happy days 
I’ve got a 110f with a dead keybed sadly. When it worked tho… sooo fat sounding!
Yamaha DX21
Yamaha QX7
Yamaha RX15
Roland MT32
Yamaha TX16W
Yeah I liked Yamaha gear, and still do