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What you describe is mostly seen with the 811A tube and happens even when vertically mounted. Although, to a lesser degree. Especially when used in modes with a sustained carrier. It's pretty hard for a real graphite anode on a 572B, to melt. Having said that, I've seen counterfeit 572Bs that did not have a graphite anode.

What this amplifier may have going for it, is a matched quad of Cetron 572Bs. In my opinion, this is the highest quality version of the 572B ever made. Exceptionally low failure rates and long life. Some audio guys would pay a lot to have two full output matched pairs of these tubes today.

[QUOTE="Shockwave, post: 844925, member: 10882"] What you describe is mostly seen with the 811A tube and happens even when vertically mounted. Although, to a lesser degree. Especially when used in modes with a sustained carrier. It's pretty hard for a real graphite anode on a 572B, to melt. Having said that, I've seen counterfeit 572Bs that did not have a graphite anode. What this amplifier may have going for it, is a matched quad of Cetron 572Bs. In my opinion, this is the highest quality version of the 572B ever made. Exceptionally low failure rates and long life. Some audio guys would pay a lot to have two full output matched pairs of these tubes today. [/QUOTE]

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