Well that is a perplexing concept… engineered in a way to prevent the tube character coming through. The only way I can think of doing that is to just power them but not put them in the audio circuitry… so, make them for show only.
Amplifier Power tubes - important to sound?
i replaced all the small tubes on my mono amplifiers and now I'm left with replacing the stock Power tubes, kt88.
I like what I hear with 12 new small tubes - telefunken nos 12ax7 and 12at7.
Now I am left with replacing 16 kt88 stock JJ tubes. will Probably use Siemens 6550 nos.
How much will this impact what I hear do you think? I recall hearing that power tubes don't make that much of a difference.