Do amplifiers deteriorate if not used?

Where can I buy a variac?I got a ML 27.5 in storage,that is not being used for at least 4-5 years now.
Thanks
George

Yioryos - I just assume your ML27.5 has linear power supply. If it has SMPS it will not do anything (start) to about 70VAC then it will put full operating voltage on the caps.

You can buy variacs... just about anywhere (that sells electronic items, that is). In its simplest form, it's a wall-wart with a multiposition switch on it indicating different output voltages per position... You just need the appropriate variac (i.e. TALK to a sales tech)
Make sure you don't reach HIGHER voltage than the caps indicate (70? 80? V).

HOWEVER, I strongly suggest you get a TECHNICIAN to do this.

Gregm
Thanks for your help/
Kijanki
What is a SMPS power supply? also do you suggest I power up like normal or I still need a Variac?
George

SMPS = switcher (switching mode power supply).

Follow Gs5556 advice and use Variac. It might not help if you have SMPS (not likely) but will save your amp otherwise.