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 Post subject: Re: Redplating 6L6 pictures
PostPosted: Jan Sat 27, 2018 6:06 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 1421
Location: Cambridge MN USA
Gassy tubes are also prone to redplating.

Scott Todd


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 Post subject: Re: Redplating 6L6 pictures
PostPosted: Feb Thu 01, 2018 8:33 am 
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Joined: Apr Sat 04, 2015 6:15 am
Posts: 792
Location: Dos Rios, CA.
My friend's Ampex V-2? 100 watt 1960's era bass amp also had (4) 7027A tubes originally in it like Dutch Rabbit's where 2 or 3 had twisted weirdly at the base...
One had a base partially melted off the sides with pins still straight and still tested good...I still have that one in my stash I think
as I gave him (or he had to find) different tubes to use with amp onstage...( C'mon you can play death metal!)
Another was completely cooked and melted from redplating which is one of the few tubes I actually ever "threw" away, rather than keep for future socket adaptors, projects, etc, etc with all the other bad or shorted tubes...

Some say there is no electrical difference between a 6L6GC and 7027A besides pin 1, but I think there is some truth to the initial RCA
advertising in trade literature promoting the 7027A as more durably constructed than a typical 6L6GC of that era.


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 Post subject: Re: Redplating 6L6 pictures
PostPosted: Feb Wed 21, 2018 7:36 pm 
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Joined: Apr Thu 21, 2011 2:00 am
Posts: 3427
Location: Georgia, 30236
Thanks for posting the pictures. I've never seen the phenomenon before.

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 Post subject: Re: Redplating 6V6 pictures
PostPosted: Feb Sun 25, 2018 10:33 pm 
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Joined: Nov Fri 10, 2006 12:24 am
Posts: 2057
Location: Thornhill, Ontario
Blast wrote:
Yikes! That second photo is a good photo of a classic example of red plating.
Very unpleasant seeing this! :-( Fix the damned bias!
Cheers,
Roger

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Roger Jones,
Thornhill, Ontario
Ontario Vintage Radio Assoc. http://www.ovra.ca


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 Post subject: Re: Redplating 6L6 pictures
PostPosted: Feb Sun 25, 2018 11:11 pm 
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Joined: Feb Wed 07, 2018 6:52 pm
Posts: 318
Location: Stone Mountain, GA
I have seen 6L6's with big holes in the plates. Caused by some serious abuse.

These same guys brought me PA speaker towers with the cones sticking out the back of the speaker. "they are a but buzzy" ;)

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 Post subject: Re: Redplating 6L6 pictures
PostPosted: Mar Mon 19, 2018 12:06 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 670
Location: Westford, MA USA
Not 6L6s, but here are some pictures of 6550s which suffered heavy abuse at the 'hands' of what has to be one of the most powerful tube guitar amplifiers ever designed, the Fender 400PS:
ImageImageImage

Yes, that's a hole right through the glass. Can only imagine just how hot those tubes got (and how brightly their plates were glowing) to cause that to happen.......... :shock: :shock: :shock:

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Adam Vaughn
Collector of old computers, video game systems, radios and other electronic equipment...
Visit my page at
http://www.electronixandmore.com/adam/index.html


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