Call Search
     

New to Ham Radio?
My Profile

Community
Articles
Forums
News
Reviews
Friends Remembered
Strays
Survey Question

Operating
Contesting
DX Cluster Spots
Propagation

Resources
Calendar
Classifieds
Ham Exams
Ham Links
List Archives
News Articles
Product Reviews
QSL Managers

Site Info
eHam Help (FAQ)
Support the site
The eHam Team
Advertising Info
Vision Statement
About eHam.net

donate to eham
   Home   Help Search  
Pages: Prev 1 [2]   Go Down
  Print  
Author Topic: 811A Socket=Loose pin contacts--how to fix? Tighten up?  (Read 4051 times)
KM1H
Member

Posts: 5509




Ignore
« Reply #15 on: April 30, 2017, 02:32:35 PM »

Off topic but since it was already mentioned....Ive tightened up real Johnson 3-500/4-250, etc sockets that werent completely black from heat that remained good once the slowed down Heathkit  fan was overhauled.

AND customers were advised to replace the missing top air deflector and dont block the air flow; both of which are causes of socket problems.

Chinese AL-811 sockets are pure junk after a few years as mentioned.  

 
Logged
VK3BL
Member

Posts: 1790


WWW

Ignore
« Reply #16 on: April 30, 2017, 04:34:59 PM »

Off topic but since it was already mentioned....Ive tightened up real Johnson 3-500/4-250, etc sockets that werent completely black from heat that remained good once the slowed down Heathkit  fan was overhauled.

AND customers were advised to replace the missing top air deflector and dont block the air flow; both of which are causes of socket problems.

Chinese AL-811 sockets are pure junk after a few years as mentioned.  

I've got a couple of NOS EF Johnson 4-250 sockets that have gone completely black on the pins too... silver plated pins will naturally tarnish unlike cheaper non plated sockets.

Just don't want the OP to get confused between the two different issues.
Logged

J.D. Mitchell BA  - VK3BL / XU7AGA - https://www.youtube.com/ratemyradio - Honesty & Integrity
KM1H
Member

Posts: 5509




Ignore
« Reply #17 on: April 30, 2017, 05:15:20 PM »

Yeah, harmless tarnish is a lot different than heat!
Logged
N6QWP
Member

Posts: 776




Ignore
« Reply #18 on: April 30, 2017, 05:38:52 PM »

Think that I have found some NOS E.F. Johnson sockets.  Problem with replacing them on the 30L-1 is that since they are mounted horizontally, they can only be accessed by dismantling the back panel.  

Art Collins designed some pretty solid gear.....but did not make it easy for users to get "into them".

Will do what I have to.....BUT, STILL HAVE NOT DETERMINED WHAT PART IS CAUSING THE FLASHOVER PROBLEM.....know that it is socket related, but what component could be shorting, or opening up or causing the extreme current to be drawn....resulting in this one tube going ballistic???

Still waiting for some input as to the exact cause of this issue.  Anyone have any ideas?  Care to venture a guess?  What should I be looking for?  Some pin moving too close to some other component?  I'm thinking maybe something to do with the bias?  What else could cause it?

Someone thought it would have to do with the anode.....but that connection is solid.  Must be something happening with the socket.  Still looking for some help here.
 
« Last Edit: April 30, 2017, 05:58:53 PM by N6QWP » Logged
Pages: Prev 1 [2]   Go Up
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.11 | SMF © 2006-2009, Simple Machines LLC Valid XHTML 1.0! Valid CSS!