SB200 amp what PA tubes are used

WA9AAA · Post by **WA9AAA** » Thu Aug 09, 2007 11:07 pm

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

KM5FL · Post by **KM5FL** » Fri Aug 10, 2007 7:38 am

This is the feedback forum. A forum that is used to post experiences with dealing with hams. You might have more responses to your question if you posted it on a more appropiate forum.

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

n3jbh · Post by **n3jbh** » Fri Aug 10, 2007 8:10 pm

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

WA9AAA · Post by **WA9AAA** » Fri Aug 10, 2007 9:32 pm

Thanks for the info.