Forums :: Resources :: Features :: Photo Gallery :: Vintage Radio Shows :: Archives :: Books
Support This Site: Contributors :: Advertise


It is currently Feb Sun 25, 2018 6:27 pm


All times are UTC [ DST ]





Post New Topic Post Reply  [ 23 posts ]  Go to page Previous  1, 2
Author Message
 Post subject: Re: Redplating 6L6 pictures
PostPosted: Jan Sat 27, 2018 6:06 pm 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 1398
Location: Cambridge MN USA
Gassy tubes are also prone to redplating.

Scott Todd


Top
 Profile  
 
 Post subject: Re: Redplating 6L6 pictures
PostPosted: Feb Thu 01, 2018 8:33 am 
Member
User avatar

Joined: Apr Sat 04, 2015 6:15 am
Posts: 587
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.


Top
 Profile  
 
 Post subject: Re: Redplating 6L6 pictures
PostPosted: Feb Wed 21, 2018 7:36 pm 
Member
User avatar

Joined: Apr Thu 21, 2011 2:00 am
Posts: 3120
Location: Georgia, 30236
Thanks for posting the pictures. I've never seen the phenomenon before.

_________________
"Any sufficiently advanced technology is indistinguishable from magic."
— Arthur C. Clarke


Top
 Profile  
 
Post New Topic Post Reply  [ 23 posts ]  Go to page Previous  1, 2

All times are UTC [ DST ]


Who is online

Users browsing this forum: No registered users and 1 guest



Search for:
Jump to:  






















Privacy Policy :: Powered by phpBB