A second trafo for YBA Delta 3 power amp

[andreaemme]

I would estimate the age to be around 22-23 years.

I know that my version (Delta, blue caps) was built in the first decade of 2000, about 10 years or a bit less after than yours (Alpha or near, orange caps); fixing system of trafo is different too compared to mine (there's a sort of plint in yours while mine is fixed through rubber puds and screws. Comparing in detail them would be quite difficult, isn't it?

 

[jean-paul]

Then also the usual issues when reusing classic stuff like cracked rubber grommets, brittle plastics suddenly breaking off, corroded metal, solder joints that are weak etc. It's a choice with guaranteed follow up work to do. Always something to do! 🙂

 

[RM]

Mine were exactly like yours. What you can see now is my adaptation for use in a different amp.

R

 

[andreaemme]

Mine were exactly like yours. What you can see now is my adaptation for use in a different amp.

I wrote to you as private message

 

[andreaemme]

Re sound: If you look closely at the picture in post 1, you will notice that the transformer is a C-core. Primary and secondary on separate bobbins. This results in a much "softer" coupling compared to a toroid, and it`s intentional to get the sound that he, YBA, wants. So, whilst it`s no problem replacing the stock transformer with a doughnut, it totally alters the timbre of the amp.

R

Please let me understand, why it seems a C-core rather than a UI-core?

Isn't C-core based on this kind of core:

and UI-core based on this one:

The structure of YBA trafo seems more similar to the second, isn't it?