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Are there two types of Pa tubes on an SB200? If so, what are they?

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The only tube produced today that will work in a Heathkit SB-200 is 572B.. RF Parts, Inc is a good source for these tubes.. You may have heard that the 811 and 572B are interchangeable.. A 572B will work (at reduced output) in place of an 811. But due to the higher plate voltage normally applied to a 572B, an 811 cannot be installed in place of it..


KM5FL

Hello Doug yes the 572-B tube is the only tube that will work in that amp. it uses a pair of them. and dont fear there still plenty around. Jeff

Thanks for the info.