Videokarma.org

Go Back   Videokarma.org TV - Video - Vintage Television & Radio Forums > Early B&W and Projection TV

We appreciate your help

in keeping this site going.
Reply
 
Thread Tools Display Modes
  #1  
Old 05-18-2015, 10:07 AM
kramden66 kramden66 is offline
VideoKarma Member
 
Join Date: Nov 2010
Location: Rockaway, NJ
Posts: 1,414
6EA8 , 6GH8 , 6U8 all compatible?

Going through my tubes i fing one that is nos , it says 6u8 / 6ea8 on the box and the tube , i look in the substitution book and see 6u8 will sub for 6ea8 but it notes parallel filamints , so my question is will a 6u8 work in place or 6ea8 ?
Reply With Quote
  #2  
Old 05-18-2015, 10:45 AM
Zenith26kc20's Avatar
Zenith26kc20 Zenith26kc20 is offline
VideoKarma Member
 
Join Date: Apr 2009
Location: New Orleans
Posts: 824
In most cases it will. I had trouble replacing a 6EA8 with one in a oscilloscope but that is the only trouble I have had.
That and 6GH8 tubes seem to have a death wish! I've replaced more of them than any other tube!
Reply With Quote
  #3  
Old 05-18-2015, 10:51 AM
kramden66 kramden66 is offline
VideoKarma Member
 
Join Date: Nov 2010
Location: Rockaway, NJ
Posts: 1,414
Yes i forgot to add that i didn't want to put 6gh8 in place of 6ea8 although more then one 6ea8 in the set has been replaced by 6gh8 , would prefer to put 6ea8 back in or 6u8 , as we all know 6gh8 new out of the box could have issues, it was just the parallel filaments warning that prompted me to post and get opinions.
mike
Reply With Quote
  #4  
Old 04-06-2017, 02:58 PM
benman94's Avatar
benman94 benman94 is offline
Resident Lunatic
 
Join Date: Jun 2011
Location: Detroit, MI
Posts: 1,190
They're all pretty much compatible. I've subbed 6U8As for 6GH8s in color circuits (a pretty sensitive application) with no ill effects. Go for it! Hell I've seen triple marked 6U8A/6EA8/6GH8 tube boxes.
Reply With Quote
  #5  
Old 04-06-2017, 02:59 PM
benman94's Avatar
benman94 benman94 is offline
Resident Lunatic
 
Join Date: Jun 2011
Location: Detroit, MI
Posts: 1,190
I think there's a 4 digit all numerical tube number that is also equivalent. 7199 maybe?
Reply With Quote
Audiokarma
  #6  
Old 04-06-2017, 06:50 PM
kvflyer kvflyer is offline
VideoKarma Member
 
Join Date: Nov 2006
Location: Fernandina Beach, FL
Posts: 1,057
Quote:
Originally Posted by benman94 View Post
I think there's a 4 digit all numerical tube number that is also equivalent. 7199 maybe?
Different pinout...
Reply With Quote
  #7  
Old 04-06-2017, 09:28 PM
Zenith26kc20's Avatar
Zenith26kc20 Zenith26kc20 is offline
VideoKarma Member
 
Join Date: Apr 2009
Location: New Orleans
Posts: 824
Dynaco amplifier input/driver tube (7199). Expensive! Different pinout (as mentioned), very prone to heater to cathode shorts! Good ones getting scarce!

The better 6GH8 I find are the RCA and GE.
Check new ones before using! I've seen new ones bad. Especially the Asian ones near the end of production. The later RCA TV's devoured many of them.
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 11:25 AM.



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