B410.E repair

[Olivier]

Hello everyone,
New to the forum, I searched but did'nt find all data I'm looking for.
Several years ago a friend gave me a B410.E amplifier (S / N: NS169) but in poor condition: the power transformer and the speakers are missing.
Searching the forum I found that the speaker is Eminence 10BAGA16AX, but which reference to replace them in new ?
What is the configuration for the connection of the 4 speakers : series, parallel or series/parallel ?
And what are the characteristics of the transformer, can we find an equivalent in new ?

Thank you for your help.
Olivier