BAT VK-75SE has fat bass & very soft treble

check the condition of the tubes? How old are they?

Is that 87db at 2.83mv or 1mv? Subtact 3db if the former. How stable is the impedence curve and how low does it dip?
Art

Tsins, How old is this amp? Are you the original owner? Estimated hours of usage? Was this change in character sudden and dramatic or was long and subtle? Have you recently made any changes in your system? Tom

My speakers are Wilmslow Prestige, I dont have
the accurate specifications. All the tubes are nearly new.
The fat bass & soft treble was from the beginning, when
I connect the BAT. I get an e-mail from the company, that tell me to connect the VK-75SE to speakers with a minimum impedence of 90-91db.
Is that true with most of the 75W/pc tubes amps?

Thank's for the inputs,

Tomer