What brand does Marshall recommend for replacement tubes? I would like to know what would be the best tubes to replace both the ECC83 and EL34 tubes with. I recently had the power tubes replaced under warranty and they used Groove Tubes. To me, they don't sound as warm as the original tubes. I play mostly blues and rock. I like the warm rich sound. I use the overdrive channel, but don't get into the metal sound.
Anyway, I figure I should ask the experts. If you could tell me where I might be able to purchase the tubes you recommend that would be a plus. I'm in the USA.
We use JJ valves as power valves and JJ and Shugang for the pre amp valves.