For your consideration, here comes Mr Ampeg Gemini combo, 15 inches speaker, dual channel, original tubes, great cosmetic and operating condition. This amp has been serviced by the shop tech I bought it from. And checked by my local trustful tech I rely on for such vintage gem.
For those who know never experienced vintage Ampeg guitar combos, I would advice you browse on yt for trying to grasp some of the feel and unique experience these amps deliver. Magical headroom, classy and definitely original killer sounds. I have had 3 Jets, 2 Geminis, 1 reverb rocket and must confess I still recall of their unique sounds somewhere in my ears. So.. hard to describe in words. Kind of the amps that make you forget other famous names (Fs and Gs) like.. instantly. 
So, back to this one.  I stated it just as "correct state" even if it delivers the great expected sound, but dry.
as 2 things needs being done here for complete functioning :   First, Reverb is not working. Original reverb tank is here, in place and complete but needs being properly rewired. New Reverb tank is also an option, available at 26 USD at flip tops site
Second, Tremolo is real weak. For those who don't rely on that, forget it. For those keen on this effect (I do belong to this category), according to my tech, the original tremolo module is now weak and simply needs changing. Here is the link to the great flip top team that builds some fresh new for 40 USD

In conclusion, the real Mac coy unique and sought after Gemini 15 inches available in Europe (which is pretty super rare) at bargain price, with some minimal cost "surgery" for trem and reverb complete functions. 
Highly regrets to sell but need some room and cash for other projects. Any question welcome. Would provide any detail needed. Cheers, 
ps : I mentioned some gross ship cost here. Please get in touch with your precise location for confirmed quote. Would ship with proper packaging and insurance.