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 Post subject: When is a tube gone bad?
PostPosted: Jun Thu 20, 2019 2:40 am 
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Joined: Jan Wed 30, 2019 3:44 am
Posts: 123
Location: Lake City, SC
I am getting the kinks out of my old Crosley 547 "Fiver," slowly but surely. After I modified the chassis grounds to the filter caps it no longer hums as badly, but the 6K6 G tube is flickering blue in the top (which it did before I messed with it.) It looks like a summer thundercloud with some lightning in it. When it flashes blue-purple the radio makes static and when it plays, it is not very clear--sounds relentlessly "vintage," not what I like. I know it's not a hi-fi but surely they weren't that bad back then.

Incidentally this tube gets very hot on top--you can't touch it, unless you have giant gloves on or really want a second-degree burn. The rectifier tube, a 5Y3, does not get as hot as the 6K6 G, even though rectifiers usually get very warm indeed.

Has this tube blown out?


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 Post subject: Re: When is a tube gone bad?
PostPosted: Jun Thu 20, 2019 2:50 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 13944
Gassy tube, keep messin' with it and you'll likely be replacing output transformer as well.

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 Post subject: Re: When is a tube gone bad?
PostPosted: Jun Thu 20, 2019 2:51 am 
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Joined: Feb Wed 07, 2018 6:52 pm
Posts: 550
Location: Stone Mountain, GA
Sounds like the tube us gassy.
Output tubes usually get hotter. The data sheet shows over 9W for normal use

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 Post subject: Re: When is a tube gone bad?
PostPosted: Jun Thu 20, 2019 2:43 pm 
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Joined: Jan Wed 30, 2019 3:44 am
Posts: 123
Location: Lake City, SC
Thanks, guys.

I substituted a 6G6G from another radio temporarily and played it without the weird sound. Now I've got to get a proper 6K6 and put it back to stock. Other than the three Flexohm resistors I think the radio is just about fixed up.


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