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 Post subject: working but glowing Raytheon BH tube
PostPosted: Feb Fri 15, 2019 2:03 am 
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I was testing a few Raytheon BH rectifier tubes in a rebuilt Sparton AC radio. The tubes all worked with a bit of difference in volume.
ONE of the tubes, which had a green instead of the "normal" tan label that the others had did work BUT it gave off a flickering purple glow.
I haven't seen this before with other BH rectifier tubes.
Is this normal or a danger signal?
Thanks,
Mark

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 Post subject: Re: working but glowing Raytheon BH tube
PostPosted: Feb Fri 15, 2019 2:11 am 
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Mark

BH tubes are filled with Helium gas. This gas leaks out over time depending on how well the tube was sealed. Over time voltage drop increases on these tubes causing lower output voltage. Some will fail or flicker.

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 Post subject: Re: working but glowing Raytheon BH tube
PostPosted: Feb Fri 15, 2019 4:42 pm 
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Old rectifiers of any type often test OK but in use cannot deliver current required. Usually B+ somewhat low.

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