I just ventured down the path of changing the tubes in my bhk250 and had a small glitch.
I pulled the original ones out and put in some gold lion Ecc82’s. On turning the amp the right speaker popped and the volume was significantly lower than the left speaker. I tried another set of the same tubes thinking the first set may have been faulty and the same thing happened. I’ve now put in the originals and it’s all working fine.
Is this a compatibility issue? Can someone give me some advice on this.