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

Stereo build- Mikael Abdellah's KT88 SE amp
Stereo build- Mikael Abdellah's KT88 SE amp
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 8th March 2018, 02:30 AM   #121
arold19 is offline arold19
diyAudio Member
 
Join Date: Nov 2002
Location: montreal
I use this amplifier since a couple of year now with a low fillament voltage of 5.7V since the 6.3V specification... Do you think it is a good idea to correct that problem? First of all, my power transformer have 3 output of 6.3, I use one output for each tube! I have 119.5V from the wall... The DC output is 400V dc... When I try the 110V input (tap) of the transformer, I have 6.4V to the filament and 440V supply so. Can I run this amplifier at this high voltage without any problem? 6.4 is a little bit high? I can put resistor to drop that voltage? Can I add a resistor to drop to 400v?
Thank you!
It is a good idea to put 2 X 100 ohm resistor directly at the output of the power transformer?

[IMG]C:\Users\Gabriel\Desktop\Gabriel\power supply.png[/IMG]

Last edited by arold19; 8th March 2018 at 02:42 AM.
  Reply With Quote
Old 8th March 2018, 02:44 AM   #122
arold19 is offline arold19
diyAudio Member
 
Join Date: Nov 2002
Location: montreal
[IMG]C:\Users\Gabriel\Desktop\Gabriel\power supply.png[/IMG]
Attached Images
File Type: png power supply.png (54.0 KB, 107 views)
  Reply With Quote
Old 8th March 2018, 12:28 PM   #123
tim614 is offline tim614  United States
diyAudio Member
 
tim614's Avatar
 
Join Date: Jun 2008
Have you try a different rectifier like a 5r4
__________________
Tim
" perfect imperfection "
  Reply With Quote
Old 8th March 2018, 01:42 PM   #124
arold19 is offline arold19
diyAudio Member
 
Join Date: Nov 2002
Location: montreal
The 5u4 tube have about 44v drop and the 5R4 is 67V.... so I will loose about 23V. I think this will be perfect. Excellent Idea, I will order a new rectifier tube!
Thank you Tim614.
  Reply With Quote
Old 10th March 2018, 12:34 AM   #125
arold19 is offline arold19
diyAudio Member
 
Join Date: Nov 2002
Location: montreal
There a lot of 5R4 tube and I'm a bit confuse... 5R4GA, 5R4GB, 5R4GY ???
I reed that the max value for the input cap is 4uF for this rectifier?

Which one I can try?
Welcome to TubeDepot.com!
  Reply With Quote

Reply


Stereo build- Mikael Abdellah's KT88 SE ampHide 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
Improvements for the Mikael Abdellah KT88??? 69CamaroSS396 Tubes / Valves 43 4th August 2017 07:49 PM
Mikael Abdellah's KT88, Loadlines soundbadger Tubes / Valves 7 4th June 2017 02:08 AM
6CA7 Mikael Abdellah's KT88 SE amp? porkchop61 Tubes / Valves 24 20th February 2011 03:31 PM
Mikael Abdellah SE KT88 ideas and questions kacernator Tubes / Valves 6 14th January 2008 01:09 PM
Looking for KT88 Amplifier Schematic by Mikael Abdellah jduffy Tubes / Valves 6 5th April 2007 09:02 PM


New To Site? Need Help?

All times are GMT. The time now is 03:24 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki