Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki 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

What is the purpose of this cap?
What is the purpose of this cap?
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 17th January 2020, 08:17 PM   #1
Steve Morley is offline Steve Morley  Canada
diyAudio Member
 
Join Date: Jan 2015
Location: Georgian Bay
Default What is the purpose of this cap?

See attached simplified schematic. Is it to provide a bit of NFB to reduce gain at high frequencies?

Thanks, Steve
Attached Images
File Type: png CAP.png (19.4 KB, 139 views)
  Reply With Quote
Old 17th January 2020, 08:29 PM   #2
Mark Tillotson is offline Mark Tillotson
diyAudio Member
 
Join Date: May 2018
Location: Cambridge UK
Could be for compensation. Its a Miller capacitor if the anode is the output signal.
  Reply With Quote
Old 17th January 2020, 08:37 PM   #3
Steve Morley is offline Steve Morley  Canada
diyAudio Member
 
Join Date: Jan 2015
Location: Georgian Bay
Yes, the anode is the output.
  Reply With Quote
Old 17th January 2020, 08:44 PM   #4
Mark Tillotson is offline Mark Tillotson
diyAudio Member
 
Join Date: May 2018
Location: Cambridge UK
With a high gain triode, mu=100, then it would look like 1.2nF to ground from the input circuits point of view, reducing gain above 130kHz or so (with that 1k resistor)
  Reply With Quote

Reply


What is the purpose of this cap?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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Re-Purpose CW AT-15s robmorin Construction Tips 3 13th May 2019 07:31 PM
What is the Purpose of the 2 Capacitors? spaceman5 Class D 9 26th October 2018 11:12 PM
What is the purpose of C3 & C4? Mario Pankov Tubes / Valves 5 27th February 2015 11:11 AM
What is the purpose of the g2 bypass cap? leadbelly Tubes / Valves 3 16th August 2008 06:43 PM
What is the purpose of NE5534 in this amp Gasho Solid State 12 11th April 2005 01:02 AM


New To Site? Need Help?

All times are GMT. The time now is 04:10 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright ©1999-2020 diyAudio
Wiki