Bgmyers - The VK55 has 8 tubes - 4 6C33 tubes and 4 6SN7 tubes. Unlike the 55SE, it does not have any 6922 or 6H30 tubes. There are several good sources for 6C33 tubes online. The list of sources of 6SN7 tubes is endless - either NOS or new production, take you pick. Do some research here and on the ' Asylum in that regard. Good hunting.
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