I don't know if this will help but I bought a LS-25 about a month ago and have tried 3 different tube set in it (the original Sovtech(sorry about he spelling), Phillip's JAN's6922 and some Tungsram's ECC88 I think.
The Tungsram's are by far the best sounding top to bottom. The stock tubes aren't to bad and the Phillips were the worst(a distance third). I was supprised by the poor sound of the Philips as these have been recommend by some other people.
The Tungsram's are by far the best sounding top to bottom. The stock tubes aren't to bad and the Phillips were the worst(a distance third). I was supprised by the poor sound of the Philips as these have been recommend by some other people.