Help identify this power amp

[funkyrx]

This amplifier was a random find included in the purchase of a tube amp.  I don’t know the history and am excited to try it out pending a fuse cap. 
Does anyone recognise this amplifier? 

Can the approximate power be identified from the components?

How would I determine whether the amp is  safe to run 4ohm speakers? 

The amp weighs 19kg. 
It has two 3a fuses that are connected to each speaker channel outlet. The cap of one fuse is missing. Where would I find a replacement fuse cap to hold old school 25x6mm bussmann fuse (pictured).

[Mendes]

If in doubt, then don't.

I would get it checked out by a qualified tech before connecting to the mains, any speakers, anything.

You have been warned 

[calypso]

If i had to guess I'd say it's a Metaxas Audio systems amp. It does have "MAS" written on the circuit board. 

[Dragoon]

Pass A40

 

D

[xlr8or]

32 minutes ago, Dragoon said:

Pass A40

 

D

 

https://www.passdiy.com/gallery/projects/24/mark

[funkyrx]

Thank you all :)

[RCAJack]

It might be worth asking in the DIY forums. This amp could have been a unique one-off original or prototype, but could be a recognizable kit that somebody knows. It’s very much home made looking and without any documentation it’s a risky purchase except as junk to rebuild or tinker with.