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 20th July 2013, 07:10 PM   #1
diyAudio Member
 
Join Date: Jun 2013
Wink Optimal Operating Point for E280F Driver for 300B Single End Amplifier

Hello , I need help to Know which is the optimal operating point for a E280F driver for 300B Amplifier .. thanks a lot
  Reply With Quote
Old 21st July 2013, 12:55 AM   #2
tomchr is offline tomchr  United States
diyAudio Member
 
tomchr's Avatar
 
Join Date: Feb 2009
Location: Greater Seattle Area
To drive a 300B, you'll need a driver that can provide 200 Vpp of swing, cleanly. Whether the E280F is a good candidate for this, I don't know. But I'm sure if you look at the datasheet, you should be able to figure out whether this tube can provide that much swing.

Driving a 300B is no simple task. I've only found a few tubes that are up for the task - JCC99, 6N6P, 12BH7A, and ECC88. But I haven't looked at every tube known to man and in my circuit, I needed a tube that had high gm and reasonable mu (20~30), which imposed some restrictions on the tube selection as well.

~Tom
__________________
21st Century Maida Regulator, Universal Filament Regulator, Damn Good 300B, Novar Spud, and more...
Neurochrome : : Audio - http://www.neurochrome.com/audio - Engineering : : Done : : Right
  Reply With Quote
Old 21st July 2013, 01:42 PM   #3
diyAudio Member
 
azazello's Avatar
 
Join Date: Aug 2008
Location: Bulgaria
U plate 160-180V and I plate 16-18 ma.
  Reply With Quote
Old 21st July 2013, 02:18 PM   #4
diyAudio Member
 
Join Date: Jun 2013
thanks friends , and is true that d3a is far better for driving 300B ?
  Reply With Quote
Old 21st July 2013, 07:48 PM   #5
euro21 is offline euro21  Hungary
diyAudio Member
 
Join Date: Sep 2004
Location: Budapest
Far better? IMHO it's thing of taste.

In my 300 SE (E280F/D3a, 2V green LED bias, 11mA DN2540 cascode CCS, 220nF CuTF coupler, FET source follower -powerdrive to A2- to 300B, 5K:8 OPT) I tried some tubes.

D3a (Siemens, Valvo, Telefunken) gives more power (up to 10W), dynamic -rock!-, but E280F (Siemens, Telefunken) more refined (only 7W).


Although I listen mostly classical and jazz music.
  Reply With Quote
Old 21st July 2013, 09:00 PM   #6
diyAudio Member
 
Join Date: Jun 2013
thanks again, is important that E280F work between 11ma and 14ma plate current aprox ?
  Reply With Quote
Old 22nd July 2013, 09:43 AM   #7
diyAudio Member
 
azazello's Avatar
 
Join Date: Aug 2008
Location: Bulgaria
More 16 ma.
  Reply With Quote
Old 22nd July 2013, 11:38 AM   #8
diyAudio Member
 
Join Date: Jun 2013
thanks azazello !!!!!
  Reply With Quote
Old 22nd July 2013, 04:08 PM   #9
tomchr is offline tomchr  United States
diyAudio Member
 
tomchr's Avatar
 
Join Date: Feb 2009
Location: Greater Seattle Area
d3A in triode is nice as well.

~Tom
__________________
21st Century Maida Regulator, Universal Filament Regulator, Damn Good 300B, Novar Spud, and more...
Neurochrome : : Audio - http://www.neurochrome.com/audio - Engineering : : Done : : Right
  Reply With Quote
Old 22nd July 2013, 08:37 PM   #10
diyAudio Member
 
Join Date: Jun 2013
thanks a lot Tom
  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
E280F Triode mode operating point frankmalz Tubes / Valves 2 20th July 2013 09:50 PM
Front End DC Operating Point Current Magnitudes acoustixman Solid State 1 6th December 2011 11:10 AM
6SL7 operating point in FCUPS 300b amp mattattnet DIY HiFi Supply 3 30th March 2011 12:21 AM
300B preamp - best operating point mkollmaier Tubes / Valves 8 20th September 2010 08:14 PM
Optimal operating point for 7N7/6SN7? pftrvlr Tubes / Valves 5 16th December 2008 04:43 PM


New To Site? Need Help?

All times are GMT. The time now is 11:07 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