JJ 6550 made in Slovakia are a good recommendation - and affordable! Other brands like Gold Lion and Tungsol are made in Russia - not a USA-friendly country!
Re-tubing a McIntosh power amp
I have a McIntosh 275 VI tube amp that I am considering changing out the tubes. Not interested in rolling, just upgrading from the stock tubes that it shipped with. Don’t want to go exotic ($$$) just trying to replace them with some upgraded, reliable tubes. Have any if you done this recently? Looking for suggestions on brands and reliable, fairly priced tube sources. Thanks!