Videokarma.org

Go Back   Videokarma.org TV - Video - Vintage Television & Radio Forums > The Amateur Radio Spot

We appreciate your help

in keeping this site going.
Reply
 
Thread Tools Display Modes
  #16  
Old 09-04-2012, 02:06 PM
bob91343 bob91343 is offline
VideoKarma Member
 
Join Date: Nov 2010
Posts: 745
The 211 is a high power output triode, if I remember correctly. Similar to the 811.
Reply With Quote
  #17  
Old 09-04-2012, 06:42 PM
dieseljeep dieseljeep is offline
VideoKarma Member
 
Join Date: Jul 2010
Posts: 7,562
Quote:
Originally Posted by Electronic M View Post
Is it really bad to operate my amps with the 12A6 tubes? I've put a lot of hours on those mono blocks and aside from some caps and a resistor they have been quite reliable....Not like I have or can afford getting two new pairs of output tubes for the next couple of months anyway....

What are 211's BTW?
I wouldn't worry about them failing. I guess if they were OK, 55 years ago, they should OK today. It was just an observation on my part about them.
They weren't used much in production equipment.
RE: the 211's they're using them in those pricey, Chinese built SE mono-block amplifiers, that are sold today. They were common in WWII, surplus transmitters.
Reply With Quote
  #18  
Old 09-12-2012, 10:32 PM
reeferman's Avatar
reeferman reeferman is offline
VideoKarma Member
 
Join Date: Jun 2004
Location: St. Louis
Posts: 583
This thread seems to have gotten way off the original subject. LOL
Reply With Quote
  #19  
Old 09-13-2012, 12:11 PM
Reece's Avatar
Reece Reece is offline
VideoKarma Member
 
Join Date: Jul 2004
Location: Cleona, PA
Posts: 2,178
Heath got going good after The War and liked to design around what they could get cheap war surplus, which included the 12A6: I have a JAN 12A6 in a Heathkit.
__________________
Reece

Perfection is hard to reach with a screwdriver.
Reply With Quote
  #20  
Old 09-13-2012, 12:38 PM
dieseljeep dieseljeep is offline
VideoKarma Member
 
Join Date: Jul 2010
Posts: 7,562
Quote:
Originally Posted by reeferman View Post
This thread seems to have gotten way off the original subject. LOL
That's what makes this website a little more interesting. Otherwise it would dry, like the rest of them.
Reply With Quote
Audiokarma
  #21  
Old 09-16-2012, 11:02 PM
wkand's Avatar
wkand wkand is offline
VideoKarma Member
 
Join Date: Oct 2005
Location: Everett WA
Posts: 260
Heathkit GR-64 Transformer

HI:

Excuse my neophyte question, but I've seen posts before in the forum where folks have suggested rewinding power transformers.

I've seen the inside of many over the years, and all look impossible to rewind due to the lamination of the core being enameled/glued. That enamel looks pretty sturdy. How does one get the iron plates apart without destroying them?

I assume that step would require some sort of solvent, but what would you use that would not damage plastic or phenolic coil form parts?

Would the rewind have to destroy all the wire in all windings to get the enamel off. Does heat work?

Thanks!
Reply With Quote
  #22  
Old 09-17-2012, 01:13 AM
bob91343 bob91343 is offline
VideoKarma Member
 
Join Date: Nov 2010
Posts: 745
Good question. It all depends on the materials used in manufacture. I have found some transformers relatively easy to disassemble, especially the lower power types. The big ones are steeped in tar and are well nigh impossible to take apart. The cost of new laminations is low, so it's really not worth it.

Many open windings are open at the termination and can be repaired without major disassembly. Shorts are another story.
Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 10:19 AM.



Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
©Copyright 2012 VideoKarma.org, All rights reserved.