Any way to not using base stop resistor? - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 22nd February 2015, 05:17 PM   #1
diyAudio Member
 
Join Date: Apr 2014
Location: US
Default Any way to not using base stop resistor?

I am doing simulation on distortion on 3EF OPS. My base stop resistor from driver to power transistor is 3.3ohm. Base stop resistor from pre-driver to driver is 47ohm.

I get rid of all the base stop resistors and I lower the 3H by a little over 3dB at 30Vpeak output. That is significant!!! I tried reducing to 2.2ohm and 20ohm resp. It's only about 1dB reduction. When I reduce to 1ohm, that really helps also. But that's very low value.

I use 5 pairs of power transistors. My question is whether it's effective to use ferrite beats on the base lead instead to tame the oscillation. If so what kind?

Attached is the asc file, no base stop, 20 ohm on driver and 0.22ohm on power transistor, the last graph is 47ohm and 0.33 original.

In the asc file, the circuit on the right is the original circuit with 47ohm and 3.3ohm base stop. The left circuit is no base stop.

Thanks

Last edited by Alan0354; 22nd February 2015 at 05:27 PM.
  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
What could cause a speaker to just stop? epalla Multi-Way 5 20th July 2007 06:49 AM
Who's going to stop Israel Daniel-A The Lounge 215 2nd June 2004 08:37 AM
screen-plate resistor and grid leak resistor metebalci Tubes / Valves 4 26th February 2004 03:18 AM
Stop!! Stop!! Stop!! Co_Driver Solid State 17 24th February 2004 04:37 PM
SushiMasterX - STOP! tiroth Everything Else 15 17th June 2002 11:49 PM


New To Site? Need Help?

All times are GMT. The time now is 01:00 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.
Copyright 1999-2015 diyAudio

Content Relevant URLs by vBSEO 3.3.2