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Tubes Turning Red SB-220

I have recently acquired a SB-220. It works perfectly on 80m, 40m and on the higher bands I do not get over 400w and the tubes begin to glow as soon as the key is pressed. tried another pair of tubes - same thing but got a little more power from new tubes. I put the others back in until I figure...
- ouxly40
- Thread
- Jul 20, 2009
- Replies: 3
- Forum: Amplifiers

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