Thanks a lot Vinyl9
I'ven't got many problems driving ProAc, bass is sometimes too loud and long, depending by the ECC88 driving the russians tubes. Now I've find the solution with a pair of Amperex NOS. I've tried Siemens Cca too, but they sounds so smooth and relaxed with a bass too looooong!
I'll try the cryogenic 6C33C. Can you give me some advice about a good seller?
Danny