[Heathkit] Replacement Tubes for SB-200

[Greg Winters]

Hi, everyone. I have a SB-200 linear of many years that I have lovingly taken care of. It still works great. However, I know that in time I will have to replace the 572-B tubes (original). I understand that there is a wide variation in quality depending on manufacturer. Would someone recommend a type and source of good replacement tubes? Thank you. Greg, K4PVA.

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