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Hi Alex, or anyone else that can answer this for me. Based on this diagram. Where would V1 be? I ordered some preamp tubes from Dougstubes.com. Based on his recommendations, I have different graded tubes for V1, V2, V3 and PI. The PI is clearly labeled and I hear that V1 should be closest to...

I bought a bias probe from Eurotubes. i wanted to be able to check and bias my amp on my own. my local tech charges at Least $60. The directions that come with it say that you should only have to check one tube because they should be matched, therefore the same. I checked the bias on one tube...