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FDP Forum / Fender Amps: Vintage (before 1985) / non reverb deluxe, power tubes getting too hot

dpoud

usa

Mar 29th, 2019 07:01 AM   Edit   Profile  

Greetings. My 1966 non reverb Deluxe just got back from being repaired. However, now it seems that the power tubes are getting way too hot. Also, it seems like one power tube is getting much hotter than the other. After playing about half an hour the amp starts to distort like crazy and it makes a strange noise. When this happened I checked out the tubes and one of the power tubes was lit up like a roman candle while the other one seemed normal. Furthermore, the rectifier tube looked like it was too bright as well. Also, if you tap the top of the amp where the power tubes are, it creates a loud scratchy sound, similar to the sound pots make when they need to be sprayed out. I'm bring the amp back to the tech on Monday, but does anybody have any idea what is going on?
thank you

BbendFender
Contributing Member
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American Patriot

About as ordinary as you can get.
Mar 29th, 2019 08:29 AM   Edit   Profile  

Just tell you tech what is going on. He should recognize the problem. My guess the bias is way off. I'm surprised he returned the amp if it was doing this. Is he an experienced tube amp tech?

dpoud

usa

Mar 29th, 2019 09:54 AM   Edit   Profile  

yes, he works for the repair service of an extremely well known company. He usually is awesome.
thank you for your help

Leftee
Contributing Member
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VA

Knuckleheading
Mar 29th, 2019 01:16 PM   Edit   Profile  

Stuff happens to/in old amps. I'm sure he'll get it sorted out promptly.

Peegoo
Contributing Member
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Just beyond Mars

there's a world of fools
Mar 29th, 2019 02:45 PM   Edit   Profile  

It's called "red plating."

Read all about it here.

Doc Sarvis
Contributing Member
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USA/Salt Lake City

Tuned Strings and Tight Lines
Mar 29th, 2019 06:02 PM   Edit   Profile  

It's weird only one power tube is affected. If the bias were off wouldn't both power tubes red plate? Also I wouldn't expect the rectifier tube to red plate.

let us know when your tech figures it out.

willie

Too Near Atlanta GA

Amp Tech Emeritus
Mar 30th, 2019 07:02 AM   Edit   Profile  

Often a tube socket pin issue...retensioning and cleaning the socket is a good thing to do with these symptoms.

w

66tele

USA

66tele
Mar 30th, 2019 10:19 AM   Edit   Profile  

+1 to willie on this. I just had this happen to a 1963 Fender Twin Reverb. A single output tube red-plated. I cleaned and re-tensioned all the output tube sockets to be certain this problem did not happen to the other sockets. Problem solved.

FDP Forum / Fender Amps: Vintage (before 1985) / non reverb deluxe, power tubes getting too hot




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