120k resistor question in SE - diyAudio
Go Back   Home > Forums > Commercial Sector > Vendor Forums > Tubelab
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Tubelab Discussion and support of Tubelab products, prototypes and experiments

Thread Tools Search this Thread
Old 26th January 2010, 10:19 AM   #1
diyAudio Member
BillEpstein's Avatar
Join Date: Feb 2004
Location: The Great Smoky Mountains
Default 120k resistor question in SE

Looking at the schematic to see if there are any critical values for the 1/4 and 2 watt 120 k's I see that there are other values for R8, R13, etc.

I only have 110k on hand which are within 10% but do any of these have really critical, say 1%, values?
  Reply With Quote
Old 26th January 2010, 01:09 PM   #2
diyAudio Member
Tubelab_com's Avatar
Join Date: Jul 2005
Location: West Virginia panhandle
None of those values are particularly critical. The larger wattage resistors do dissipate some power and should not be substituted with a smaller wattage resistor. R8 and R19 are wired directly across the input. These should be a high quality resistor since cheap resistors may introduce noise. The value is not at all critical and anything from 100K to 330K should work.
Tubelab, it's 5 year mission. To explore strange new tubes, to seek out new circuits and topologies, to boldly go where no tube has gone before......
  Reply With Quote
Old 26th January 2010, 02:27 PM   #3
diyAudio Member
BillEpstein's Avatar
Join Date: Feb 2004
Location: The Great Smoky Mountains
Thanks, George, and 1 more on R6, the 10k 5 watt. I have a 5 watt Mills there that looks about the same size as a 2 watt Kiwame, and I've read it runs really hot. I had trouble with bigger Mills in my other 45 amp and wonder if, like I did there, a 20 watt aluminum housed is necessary?
  Reply With Quote
Old 26th January 2010, 03:27 PM   #4
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
Depending on your B+...5W is pushing it. I went with a 7W here and it is probably one of the hottest components on the PCB when I am running 300B voltages. I picked up a aluminum housed 10W to mount to the chassis when the time comes.
  Reply With Quote


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
Replacing the cathode resistor with a current source in SE ? 2wo Tubes / Valves 12 6th November 2009 01:31 AM
simple se cathode resistor question pforeman Tubelab 4 1st June 2009 05:08 PM
SE 6V6 cathode resistor value bereanbill Tubes / Valves 7 24th May 2009 04:11 PM
brown alps pot replacement?120k can i use 50 k to replace it homertooties Solid State 2 8th December 2006 06:12 PM
Parallel SE vs. Single SE Output Question valveitude Tubes / Valves 19 4th May 2005 05:36 PM

New To Site? Need Help?

All times are GMT. The time now is 05:51 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2