Transformer for Quad 405

Hello, community!

I bought my first Quad 405 about 20 years ago and I liked it so much I also bought a 405-2 a couple of years later. I really like them!

From my experience, I know that the most common problem is the noise in the transformer and I had it replaced on my first. My 405-2 is suffering from the same problem, but, unfortunately, the super expert technician that custom made my transformer and repaired the amp passed away a few years ago and I don't find anyone expert enough to tell me what the best transformer is.

My custom one is not multi voltage because I don't need that and is a toroidal model. I'm searching for a transformer, but I can't find any information.

Can anyone help?

Thanks a lot!!