cathode connection in directly heated triodes - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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
Thread Tools Search this Thread
Old 20th March 2004, 07:36 AM   #1
diyAudio Member
Join Date: Feb 2004
Location: Istanbul/TURKEY
Default cathode connection in directly heated triodes


Cathode circuit is connected to the point half in between the heater pins of directly heated triodes (such as 300B). I think this is to eliminate hum by connecting +Vh/2 to one and -Vh/2 to the other pin. Is it right ?

Is such a connection necessary if triode is heated with a DC supply ? will simply connecting the Vh (+) supply to one and cathode circuit to other pin of triode work ?

Thanks in advance.

  Reply With Quote
Old 20th March 2004, 02:24 PM   #2
diyAudio Member
Sch3mat1c's Avatar
Join Date: Jan 2003
Location: Milwaukee, WI
Send a message via ICQ to Sch3mat1c Send a message via AIM to Sch3mat1c
Right on both counts. In fact tube data is traced with DC heaters and ground connected to a specific pin. I forget which though.

Seven Transistor Labs, LLC
Projects and Resources / Electronic Design and Consultation
  Reply With Quote
Old 21st March 2004, 08:58 PM   #3
diyAudio Member
Join Date: Feb 2004
Location: Istanbul/TURKEY
Thank you so much...

  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
Directly heated Cathode/insulation question john buckland Tubes / Valves 16 1st April 2008 05:58 PM
a directly heated monkey? Rocky Tubes / Valves 42 5th May 2006 01:04 AM
Directly heated cathodes, but why? Hesky Tubes / Valves 12 8th June 2004 12:18 AM

New To Site? Need Help?

All times are GMT. The time now is 07:13 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