Go Back   Home > Forums > Commercial Sector > Vendor Forums > Tubelab

Tubelab Discussion and support of Tubelab products, prototypes and experiments

Reply
 
Thread Tools Search this Thread
Old 28th April 2009, 02:42 AM   #71
rknize is offline rknize  United States
diyAudio Member
 
rknize's Avatar
 
Join Date: Feb 2009
Location: Chicagoland
Send a message via AIM to rknize Send a message via Yahoo to rknize
Thanks. Nice pic too. It's cool how every type of tube is a little different. The Sylvania 6V6GTs in my first amp glowed strongly and I always assumed this was typical. The JAN Sylvania 6L6GCs I have no glass glow, but the micas glow brightly. Weird.

Back to the SED EL34s...they are great tubes. That pic was taken of the Dynaco. As far as modern production tubes go, I have to tip my hat to SED. I have some of their KT88s too and they are also great sounding tubes.
  Reply With Quote
Old 28th April 2009, 11:14 AM   #72
diyAudio Member
 
oldmanStrat's Avatar
 
Join Date: Apr 2009
Its a bit blurry... but you can see the blue up against the glass...

I'll have to see if I can find my tripod...
Attached Images
File Type: jpg 000_0054a.jpg (33.1 KB, 205 views)
__________________
For security reasons my name is changed daily...
  Reply With Quote
Old 28th April 2009, 02:42 PM   #73
rknize is offline rknize  United States
diyAudio Member
 
rknize's Avatar
 
Join Date: Feb 2009
Location: Chicagoland
Send a message via AIM to rknize Send a message via Yahoo to rknize
I believe I may get a bit of that as well. If it is only on one tube (even after swapping them) and especially if it is only in one large spot, the usually means there is a slight misalignment in the mica that is allowing electrons to escape the cage and hit the glass right there. Many tubes, like Ty's, always do it and they will generally all look the same.

It's nothing to worry about unless the difference in the one tube is quite pronounced. Your's looks typical. My SEDs probably have had a bit of what you have, I can't remember. I've had some tubes, JJ's in particular, that have assembly issues and one of the symptoms other than internal shorts is a very large, bright blue glow in one spot that none of the other tubes have. Looking carefully at the micas, I could usually spot the problem.

Russ
  Reply With Quote
Old 29th April 2009, 03:14 AM   #74
diyAudio Member
 
Ty_Bower's Avatar
 
Join Date: Mar 2007
Location: Newark, DE
Found an even better "blue glow" photo in my collection. This one is a Shuguang 6L6GC in my Simple SE. These tubes don't sound half bad, especially considering how stinking cheap they were.

Click the image to open in full size. Click the image to open in full size.
  Reply With Quote
Old 29th April 2009, 05:52 AM   #75
rknize is offline rknize  United States
diyAudio Member
 
rknize's Avatar
 
Join Date: Feb 2009
Location: Chicagoland
Send a message via AIM to rknize Send a message via Yahoo to rknize
Looks nice. I have a quad of "Valve Art" EL34s (Shuguang, but no glowing) and I have to agree...they sound pretty good to my ears. The SEDs seemed a bit more balanced to me, but I dunno. I have a hard time with these kinds of comparisons.

Russ
  Reply With Quote
Old 29th April 2009, 02:05 PM   #76
diyAudio Member
 
oldmanStrat's Avatar
 
Join Date: Apr 2009
I kind of like the blue glow - it adds to the whole tube mystique ...

I found this pic on wikipedia - as long as the tube works it would look pretty cool in an amp...
Attached Images
File Type: jpg 800px-valve_glowing_blue.jpg (51.4 KB, 153 views)
__________________
For security reasons my name is changed daily...
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Starting a First Watt F3 build and need some help Marsfrogie Pass Labs 59 7th October 2010 12:13 AM
Starting my Bottlehead Paramour 2A3 build Wardsweb Tubes / Valves 2 19th August 2003 10:42 PM
Heathkit AA-151 for starting my first DIY build??? bbaker6212 Tubes / Valves 1 27th August 2002 11:27 PM


New To Site? Need Help?

All times are GMT. The time now is 02:33 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2