Ha! now I'm catching on...
No one mention about input small signal tubes(or a poorly designed input circuitry). I'm not sure what input tubes are there in Jolida but I think that 80% of your problem are either inside or outside the input tubes + you've probably got a sensitive amp. I believe that further follow-ups can advise you which tubes you should try. IMHO the circuitry have to have a free of microphonics designe no-matter what tubes you're using.
No one mention about input small signal tubes(or a poorly designed input circuitry). I'm not sure what input tubes are there in Jolida but I think that 80% of your problem are either inside or outside the input tubes + you've probably got a sensitive amp. I believe that further follow-ups can advise you which tubes you should try. IMHO the circuitry have to have a free of microphonics designe no-matter what tubes you're using.