As the title suggests. 4.4uf 650v capacitor wanted for used with Philips BSX180H96 180w SOX gear.

 hace u thought of getting caps from microwave ovens
U may jave to put  a few in parallel  to add up the uF value

That's something to think about.

I'd get just a couple of good quality film capacitors from electronics supply house like RS. 2x2.2uF will give you 4.4uF needed. 650V rating is a bit vague - if it means AC, 630VAC/1000VDC or more capacitors will be OK.