Thread: RCA 21CT55 #8802897 is Dead
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  #98  
Old 01-15-2011, 06:55 PM
3Guncolor 3Guncolor is offline
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Join Date: Mar 2005
Posts: 312
Back in the day it was normal to run these tubes 21FJP22/FBP at 25kv. 20 to 24 would be on the low side.
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