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Old 09-04-2005, 10:47 PM
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holmesuser01 holmesuser01 is offline
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Join Date: Jul 2005
Location: Asheville NC
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If someone has replaced the 6BK4 and the 3A3/3AT2, etc. with one of the improved versions, radiation chances were less.

When I had my shop, the biggest failures were sweep tubes, and high voltage rectifiers, and regulators. I always checked HV levels, but rarely found them high.

Had an RCA CTC-38 that would come in every 2 years or so. It was run all day long in a hotel lobby. I replaced the 3A3, and the 6BK4, and set the HV. Once I found the HV running at 28K. The hotel said it was sizzling, and the pic would dim out on bright scenes, make a spark sound, and come back on. The 6BK4 resistor (dont remember the value) was burned open, The 6BK4 was shorted. I stopped buying LINDAL tubes about that time.

Went back to RCA's leaded glass 6BK4C. I dont recall ever having to replace one of them again.
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