Go Back   Home > Forums > Commercial Sector > Vendor Forums > Tubelab

Tubelab Discussion and support of Tubelab products, prototypes and experiments

Reply
 
Thread Tools Search this Thread
Old 17th December 2010, 06:37 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, 09:45 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

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
Simple SE meets ten pounds of power transformer DualTriode Tubelab 9 7th November 2010 09:16 PM
Hot power transformer in Simple SE? fandersen Tubelab 4 23rd September 2010 02:51 AM
Simple SE power transfomer question? ryc989 Tubelab 29 3rd May 2010 07:29 PM
Simple Simple SE questions nodiak Tubelab 57 2nd February 2010 11:02 PM
tubelab simple se: increasing the drive pforeman Tubes / Valves 8 1st December 2009 07:20 PM


New To Site? Need Help?

All times are GMT. The time now is 02:14 PM.


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