I had similar problems with my Eastern Electric pre-amp that uses 12au7s.
I have discovered if I use only premium tubes from Mullard, Cifte, and Telefunken I have had no issues.
My favorite between the three? It's a toss up between the Ciftes and the Telefunkens.
Give them a try, you won't be disappointed.
I have discovered if I use only premium tubes from Mullard, Cifte, and Telefunken I have had no issues.
My favorite between the three? It's a toss up between the Ciftes and the Telefunkens.
Give them a try, you won't be disappointed.