Estimate Miller of Triode Strapped Pentode - 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 12th January 2009, 11:23 PM   #1
diyAudio Member
 
dsavitsk's Avatar
 
Join Date: Jan 2005
Location: Hartford
Default Estimate Miller of Triode Strapped Pentode

Is there a good method to estimate the Miller capacitance of a triode strapped pentode?
  Reply With Quote
Old 13th January 2009, 01:43 AM   #2
diyAudio Moderator Emeritus
 
ray_moth's Avatar
 
Join Date: Jan 2004
Location: Jakarta
It makes sense for it to be Cg1g2 X stage gain. I'm guessing that the plate is too far from g1 for there to be a significant capacitance between them, but I could be wrong.
  Reply With Quote
Old 13th January 2009, 02:29 AM   #3
diyAudio Member
 
Join Date: Oct 2004
Location: Maui, Hawai'i, USA
That sounds right to me; after all, that's the idea of a tetrode in de foist place, no?  The problem would be to find this capacitance.  The datasheets very seldom give such data for trioded pentodes; we're lucky to get plate curves.

I wonder, would this spec have to be tested for on a hot tube in-circuit, or could we just stick an LCR meter on the appropriate pins on a cold tube sitting on the bench?

Aloha,

Poinz
AudioTropic
  Reply With Quote
Old 13th January 2009, 05:27 AM   #4
diyAudio Moderator Emeritus
 
ray_moth's Avatar
 
Join Date: Jan 2004
Location: Jakarta
Hi Ponz,

I don't see why the tube has to be hot to get this measurement. Temperature would make a difference, I suppose, but it should be slight.
  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
Pentode Miller Capacitance, and which spec value to use? flysig Tubes / Valves 5 30th May 2009 08:59 PM
Wanted Triode strapped curves for pentode of ECL82. Shoog Tubes / Valves 2 28th March 2007 08:03 PM
PP-Triode , PP-UL , PP-Pentode-strapped-as-Triode percy Tubes / Valves 23 22nd January 2007 12:36 AM
Recommendations needed for designs of PP pentode strapped as Triode percy Tubes / Valves 24 22nd October 2004 09:03 PM
E180F triode-strapped. jim Tubes / Valves 15 16th September 2003 11:00 AM


New To Site? Need Help?

All times are GMT. The time now is 07:08 AM.


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