How is wattage calculated when only using a single section? - 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 11th May 2010, 09:17 PM   #1
phrarod is offline phrarod  United States
diyAudio Member
 
Join Date: Aug 2005
Default How is wattage calculated when only using a single section?

I'm only using half of a 5965 which states the maximum wattage is 2W. I'm already over that but if I'm using a single section is the max wattage then 4W?

I can't find any information on this.
  Reply With Quote
Old 11th May 2010, 09:21 PM   #2
diyAudio Member
 
Join Date: Apr 2003
Location: Southern Tier NY
GE Tubesheet says 2.2 watt each plate or a total of 4 watts for both. Design Maximum.
__________________
Living Life Doing the Waltz in 4/4 meter.
  Reply With Quote
Old 11th May 2010, 09:22 PM   #3
phrarod is offline phrarod  United States
diyAudio Member
 
Join Date: Aug 2005
I'm running 2.20 on a single plate. What are the consequences? BTW, this is a 7062 which is supposed to be fairly identical to the 5965 but the data sheet says 2W max anode. http://tubedata.milbert.com/sheets/009/e/E180CC.pdf

Last edited by phrarod; 11th May 2010 at 09:28 PM.
  Reply With Quote
Old 11th May 2010, 09:28 PM   #4
diyAudio Member
 
Join Date: Apr 2007
I've never seen any references that states that you can exceed the dissipation limit if you only run one section. Normally it's thee other way around, the max dissipation is listed per section and sometimes there is a more strict limit for both sections combined. One extreme example is the 6BX7 which has a 10W per section limit but only 12W for both sections.

/Olof
__________________
I'm not allowed to do magic, union rules...
  Reply With Quote
Old 11th May 2010, 11:03 PM   #5
phrarod is offline phrarod  United States
diyAudio Member
 
Join Date: Aug 2005
I just went up some in resistance on the cathode and now I'm running 2.07W on one side and 1.97W on the other. According to the datasheet I'm still over. What is a target number would you think to reach? 1.8W 1.9W
  Reply With Quote
Old 11th May 2010, 11:58 PM   #6
Arnulf is offline Arnulf  Europe
diyAudio Member
 
Join Date: Feb 2009
Look, it's a tradeoff: dissipation versus lifespan, and with higher dissipation comes the increased linearity.

How long do you want your tube to last ? People have run EL84 in RF duty (!) at 30+W (!!). Yes, it didn't as last long as specified in datasheet, but it worked while it did.

Run your tube close to datasheet's specified maximum dissipation and you're likely to get the datasheet's suggested lifespan of what, 1-5K hours. Run your [preamp] tube (which is what you've got there) at lower than maximum disipation and it will last "forever".
__________________
mod verb, transitive /mod/ to state that one is utterly clueless about the operation of device to be "modded" and into "fixing" things that are not broken; "My new amplifier sounds great so I want to mod it."
  Reply With Quote
Old 12th May 2010, 12:31 AM   #7
phrarod is offline phrarod  United States
diyAudio Member
 
Join Date: Aug 2005
Thanks for the education. Yes, I can live with replacing the tubes every year or couple years if they need it. I wasn't sure if I was causing harm like a meltdown inside the tube.

That clears it up. This circuit sounds best running over 11mA of bias currant. Just going up to 249 and dropping the wattage down to 2.07W from 2.20W dropped the bias current to around 10.2-10.5 whereas it was at 11.2-11.5 which sounded better.

By the way I'm running the 'naked' resistors by Texas Corp. Really transparent.
  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
Differences between single-section and two-section filters Sunsun22 Power Supplies 3 20th November 2009 05:23 AM
Does preamp wattage effect power amps wattage? JonnySwitchblade Solid State 7 4th July 2007 03:18 AM
How is the effective piston area of a cone calculated? 454Casull Multi-Way 2 21st June 2004 08:51 PM
Single section equivalent of 6SL7 cdeveza Tubes / Valves 21 22nd May 2003 05:45 PM
Speaker wattage[rms] versus amp wattage[rms] Bull Multi-Way 5 9th November 2002 05:55 AM


New To Site? Need Help?

All times are GMT. The time now is 03:11 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