Bhk 250 amp

Hello folks. I recently purchased a beautiful used Bhk 250. I mated it with my Bhk preamp. The question I had was I was trying to tube roll with it and I have some Brimar 12au7’s and when I put these in the 250 I got some really strange sounds from the speakers. I put the tungsrams back in it sounds great. Has anyone else encountered this issue?

The BHK amps only use 6/7v tubes. 12v won’t work as you’ve found. Save the 12v for your preamp.


Thanks. After searching I just found that out : )