Effects of high heater voltage? - Page 4 - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 18th April 2003, 07:48 AM   #31
diyAudio Member
 
Join Date: Apr 2003
Location: småland
Guys, You are the best!
I never thought that my little question would get ANY answer. (I'm rather new to computers/internet and this kind of forum)

Richardson/Dushmann ???? Did a search here and found nothing.
And I'm not afraid to ask.

I'm old enough to know my eletronics about electrones, holes, etc (been a electrician for over 30 years) But when it comes to tubes, they were all vapourized when I attended high-school.

"I'm not old, it's just that I have lived longer the the rest of you"

thanks again

björn
  Reply With Quote
Old 18th April 2003, 12:49 PM   #32
EC8010 is offline EC8010  United Kingdom
diyAudio Moderator Emeritus
 
EC8010's Avatar
 
Join Date: Jan 2003
Location: Near London. UK
Default Re: Mr. Microwave speaks.....

Quote:
Originally posted by Jocko Homo
Too cold, the tube gets "gassy", and emission goes down.....which leads to high helix current, and......etc....
That's interesting. I assume that you are talking about power valves here, where the anode gets hot and outgasses. There's not a lot of call for klystrons and the like in audio, so I know little about them. Are they gettered?
__________________
The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...
  Reply With Quote
Old 18th April 2003, 01:01 PM   #33
EC8010 is offline EC8010  United Kingdom
diyAudio Moderator Emeritus
 
EC8010's Avatar
 
Join Date: Jan 2003
Location: Near London. UK
Default Richardson/Dushmann

I'm not even going to attempt to write the equation in this box, so here's a scan:
Attached Images
File Type: gif rd.gif (71.3 KB, 104 views)
__________________
The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...
  Reply With Quote
Old 18th April 2003, 03:54 PM   #34
Banned
 
Join Date: Feb 2002
Location: As far from the NOSsers as possible
Default TWTs

Yes, they had a "getter". Most were made by EEV, I assume you may know who they are. Later, Varian and Siemens got into the act.

As for life expectancy vs. anode voltage; yes, lowering it did greatly extend life. But it was necessary to get maximum power out at all times. Otherwise, no one would have made any long-distance phone calls up until the late 80s when single-mode fiber became common.

Jocko
  Reply With Quote
Old 18th April 2003, 04:21 PM   #35
EC8010 is offline EC8010  United Kingdom
diyAudio Moderator Emeritus
 
EC8010's Avatar
 
Join Date: Jan 2003
Location: Near London. UK
Default Re: TWTs

Quote:
Originally posted by Jocko Homo
But it was necessary to get maximum power out at all times.
Exactly. If you don't run a power valve at full tilt, you need a really good excuse for wasting that heater power.
__________________
The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...
  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
DC Heater Voltage Bengali Tubes / Valves 9 2nd February 2009 05:19 AM
Too low heater voltage? jkeny Tubes / Valves 6 26th August 2008 01:08 AM
Effects of voltage drop??? kyrie48 Solid State 1 25th October 2007 09:29 AM
High Voltage Heater info mashaffer Tubes / Valves 2 20th June 2007 04:47 AM
DHT heater voltage zobsky Tubes / Valves 23 9th September 2006 04:55 PM


New To Site? Need Help?

All times are GMT. The time now is 04:35 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