Sometimes I will replace all the tubes with 'matched' tubes when one blows. then, I keep the still functional (mis)matched tubes as replacements for when I might need them. Yes, this can make sense.
Still, I do think of those times from the 1960's, etc. when the brand and vintage really did not matter at all. As in, when running 6550 tubes, replace with a 6550...unless all you have is the KT88.
Still, I do think of those times from the 1960's, etc. when the brand and vintage really did not matter at all. As in, when running 6550 tubes, replace with a 6550...unless all you have is the KT88.