Anyone out there?
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Thank you. Do you know for a fact that all 4 small tubes are used in line section?
The Dialogue 2 has HT bypass inputs. This means that its amp section can be used separately by running an outboard preamp into. I'm guessing that one pair of small tubes is for the line section (either gain or buffer), and one pair is for amp drivers.
This is why I ask the question. If I use the amp section only, the line stage is not in play and I can use any ol crap tubes in there, and I only need to concern myself with rolling tubes in the amp section.
Just saw this - Maxmad is correct, all four smaller tubes you are asking about are the line stage, and the four larger ones are the power tubes. My understanding is that when you use the HT bypass, it bypasses the linestage, as the HT receiver is functioning as a preamp, so the smaller tubes would not be in use in that situation at all, but this could be incorrect. I have not yet used mine as part of a home theater system and don't plan to for some time yet, I have only used it for two-channel listening. You should contact Kevin Deal, I think his name is, at Upscale Audio, who is the US distributor of PrimaLuna. Please let me know if what I said here is incorrect!