SimpleSE R17/27 - 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 4th September 2010, 08:32 PM   #1
diyAudio Member
Join Date: Jan 2010
Location: Victoria, BC
Default SimpleSE R17/27

Assuming the same rating (i.e. 560ohm 5W), will different types of the cathode bias resistors (R17/27) affect the sound quality? For example wire wound, metal film, metal oxide, etc.
  Reply With Quote
Old 4th September 2010, 11:01 PM   #2
diyAudio Member
Ty_Bower's Avatar
Join Date: Mar 2007
Location: Newark, DE
It shouldn't. Those resistors are just carrying DC. The idle current through the tube passes through that resistor, but any AC (audio) signal should be going through the bypass capacitor, C12 or C22.

Metal film would be a poor choice for this position. Metal film types tend to catch fire and burn if you happen to exceed their power handling limit. This resistor needs to be able to dissipate a fair amount of power. Metal oxide types are often rated flameproof, but again you need to ensure you've got sufficient power handling capability. KT88 type tubes can draw a lot of current, and you really need a minimum 5 watt rating for the cathode resistor. It might be difficult to find that in a metal oxide type.
  Reply With Quote
Old 5th September 2010, 04:34 AM   #3
diyAudio Member
Join Date: Jan 2010
Location: Victoria, BC
Thanks Ty,

This was a bit of a hypothetical question. I didn't think the cathode bias resistor affected the sound buy I'm not the electrical engineer I did instal 5 watt wirewound resistors and everything is working fine. Just trying to learn more
  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
Mark Levinson №27.5 Taifun Solid State 101 14th March 2011 09:57 PM
Adjusting Pioneer A-27 hifileslie Solid State 5 4th February 2011 07:05 AM
Accuphase C-27 Onvinyl Analog Line Level 4 25th February 2009 04:27 PM
To Fix T 27 Tweeter? Multi-Way 0 19th May 2004 03:42 PM
type 27 pre exurbia Tubes / Valves 14 26th December 2003 04:01 PM

New To Site? Need Help?

All times are GMT. The time now is 05:50 AM.

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