Go Back   Home > Forums > > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki 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 17th December 2010, 07:37 PM   #1
Skorpio is offline Skorpio  Denmark
diyAudio Member
Join Date: Mar 2004
Location: Denmark
Default Simple SE Simple Power Drive?

If the output to the power stage grid resistor is taken from the CCS source terminal (top of current setting resistor), the driver stage will have an output impedance in the range of 300-400 Ohms, and the load from the power stage is isolated from the driver valve, increasing linearity...or?

I have done this with exelent results in a line stage using DN2540 MOS-FET as CCS, and can see no reason for this not working also in Simple SE...
  Reply With Quote
Old 5th May 2011, 10:45 AM   #2
Skorpio is offline Skorpio  Denmark
diyAudio Member
Join Date: Mar 2004
Location: Denmark
My +B seems to be in the 400V range and I want to use LED bias on the ECC81/12AT7. I would consider half supply (aprox200V)on output. The only way to move this is to find right LED value (voltage drop at 10mA).

In datasheet ECC81 has 250V with 10mA and -2V grid bias. At -2.2V even higher (above 250V). So it would seem that optimum LED voltage would be in the 1.2V range for 200V at Anode?

But this seems quite low when compared to resistor bias (220R/10mA=2.2V)...

Am I missing something?
  Reply With Quote


Simple SE Simple Power Drive?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
Simple SE meets ten pounds of power transformer DualTriode Tubelab 9 7th November 2010 10:16 PM
Hot power transformer in Simple SE? fandersen Tubelab 4 23rd September 2010 03:51 AM
Simple SE power transfomer question? ryc989 Tubelab 29 3rd May 2010 08:29 PM
Simple Simple SE questions nodiak Tubelab 57 3rd February 2010 12:02 AM
tubelab simple se: increasing the drive pforeman Tubelab 8 1st December 2009 08:20 PM

New To Site? Need Help?

All times are GMT. The time now is 09:50 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio