Need a 4 way electronic crossover

suggest you find a local electronics repair shop and take it for a service/restoration. you may find it can be repaired easily. 

Its definitely worth saving. and after a restoration probably sound like new. 

right now the state of the art for analog crossovers is the CS Port ACN400. but it’s not cheap. if you want a cheap one it will likely need to be digital, or a cheap pro-audio product from a web site like Sweetwater.

https://www.csport.audio/products/products-active_crossover_acn400-en.html

I believe this would work.

Supports all standard crossover points and slopes + has built in EQ which is very handy for taming bass modes.

Thank you all for your advice.  I'll look into the CS Port and trying to find a good repair shop.

I suggest you see if any of the Marchand models is suitable.

Something else to consider is looking at what minidsp has to offer.  

I had a Marchand crossover and it was an exceptional piece.  Well-built and sounded great.

I have not seen mixed reviews for Marchand.  Occasionally used ones come up for sale.  New are 800 to 1000 approx.  

There is also a new brand that advertises quality parts used.  The name escapes me.  They have 2 models priced at $599 and $799.

I would also fix the old one, if possible. 

I am currently using a Marchand and it works as advertised, it doesn't do anything deleterious to the signal.  Having said that I would attempt to have the Sony rebuilt simply because you obviously like what it does.

Regards,

barts 

These don't measure too bad.

Thank you all for your responses, very helpful.  I will try to have my Sony crossover fixed as it's a great piece and would like to keep it.  If not able to do so I will look into getting the Marchand.