Tubes Asylum

What is this on the mica of my tungsram 12ax7

70.188.148.177

earnie3

I have a few tungsram 12ax7's. That all look the same and have the little square badge on the getter support but one has a rectangle looking piece of plastic. What is this?

Follow Ups:

RE: What is this on the mica of my tungsram 12ax7 - unclestu 19:18:46 04/15/14 (3)
It is another piece of mica to provide centering action for the top sheet. Very common on older type tubes
- "wings" - FenderLover 00:44:56 04/16/14 (2)
  Stu,
  
  You know, I've owned plenty of Tungsram ECC83 and ECC82's. I don't remember ever seeing one with that plastic wing on the top mica. I'll have to look at my stash, again.
  - RE: "wings" - unclestu 11:48:52 04/16/14 (1)
    Never seen in small 9 [in tubes, but in 2A3's and the like.
    
    Kinda hard to tell from the photo but originally those prongs on the mica sheets are supposed to crush against the glass envelop to center the structure within the tube. I suspect the mica is undersized, and the wing added in order tension the assembly.
    
    One side of the mica shows the points not deformed as it should
    - RE: "wings" - PakProtector 02:42:37 04/21/14 (0)
      That little rectangle is also mica; there are few cheap plastics that can stand the service environment...:) maybe none.
      cheers,
      Douglas
      
      Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.

Post a Followup:

FAQ

Post a Message!

Forgot Password?

Moniker (Username):
Password (Optional):
	Remember my Moniker & Password (What's this?) Eat Me
E-Mail (Optional):
Subject:

Message:	(Posts are subject to Content Rules)

Optional Link URL:
Optional Link Title:
Optional Image URL:
Upload Image:
E-mail Replies:	Automagically notify you when someone responds.

To view your new posting or follow-up, click on the RELOAD or REFRESH button on your browser.

This post is made possible by the generous support of people like you and our sponsors:

Parts Connexion