Solentgreen, I have a 4Bst and have tried various preamps. You mentioned the Rogue 99 Magnum; a preamp that I bought new. Let me first say that the Rogue is a nice sounding preamp and is well built peice of equipment.
But having the opportunity to audition other tube preamps within my system, I was not happy with the purchase of the Rogue. Its sound was to close to solid state with a slight touch of tube presentation, and it was very, very microphonic.
I am currently using a Cary SLP98L and this is a great sounding preamp to match the the Bryston....it has the tube magic that the Rogue was lacking.
My 2 cents......good luck KEK
But having the opportunity to audition other tube preamps within my system, I was not happy with the purchase of the Rogue. Its sound was to close to solid state with a slight touch of tube presentation, and it was very, very microphonic.
I am currently using a Cary SLP98L and this is a great sounding preamp to match the the Bryston....it has the tube magic that the Rogue was lacking.
My 2 cents......good luck KEK