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

10M45S problem
10M45S problem
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 4th February 2013, 07:50 PM   #21
scott17 is offline scott17
diyAudio Member
 
Join Date: Aug 2009
Quote:
Originally Posted by ikoflexer View Post
Keep the gate resistor 1k and replace the cathode resistor that sets the current with a 2k variable resistor and very carefully adjust it in the circuit. If that doesn't make it work then switch to a gyrator (just an extra couple of resistors and one capacitor) which will probably work better anyway. (Be careful adjusting that resistor with the high voltage present.)
I'm not familiar at all with the gyrator circuit. Do you know a good resource that will help me?

I'm going to replace the left channel CCS first, as the right channel seems to work fine.

Thank you.
  Reply With Quote
Old 4th February 2013, 08:09 PM   #22
analog_sa is offline analog_sa  Europe
diyAudio Member
 
analog_sa's Avatar
 
Join Date: Aug 2002
Location: Cascais
How is grounding, local decoupling? Sounds very much like motorboating - the CCS raises the OLG compared to a resistor and voila.
  Reply With Quote
Old 4th February 2013, 08:12 PM   #23
ultrafi is offline ultrafi  United States
Account disabled at member's request
 
Join Date: Sep 2009
Stop! Read the datasheet for the 10M45. You really need more current through the 10M45 for it to work well.
  Reply With Quote
Old 4th February 2013, 08:16 PM   #24
scott17 is offline scott17
diyAudio Member
 
Join Date: Aug 2009
I believe the grounding is OK.

OLG?

Quote:
Originally Posted by analog_sa View Post
How is grounding, local decoupling? Sounds very much like motorboating - the CCS raises the OLG compared to a resistor and voila.
  Reply With Quote
Old 4th February 2013, 08:20 PM   #25
scott17 is offline scott17
diyAudio Member
 
Join Date: Aug 2009
Quote:
Originally Posted by ultrafi View Post
Stop! Read the datasheet for the 10M45. You really need more current through the 10M45 for it to work well.
My datasheet says good for 2 - 100mA. I used the data sheet to calculate the correct resistor. I could not find on my data sheet where it says it needs more current to work well. I am interested in reading more about that. Do you have a link?

Thanks.
  Reply With Quote
Old 4th February 2013, 08:20 PM   #26
iko is offline iko  Canada
diyAudio Moderator
 
iko's Avatar
 
Join Date: May 2008
Location: Toronto
10M45S problem
Quote:
Originally Posted by ultrafi View Post
Stop! Read the datasheet for the 10M45. You really need more current through the 10M45 for it to work well.
+1
  Reply With Quote
Old 6th February 2013, 08:58 PM   #27
scott17 is offline scott17
diyAudio Member
 
Join Date: Aug 2009
I disconnected the gNFB feedback loop today and voila, the CCS works fine.

I haven't had time to go any further. Since the right channel worked, and the left channel had the problem, I'm guessing that one of the output transformers had the blue & brown plate wires reversed from the factory.

I'll put it on the scope when I get a chance and verify that.

Thanks for all the help.

Scott
  Reply With Quote
Old 6th February 2013, 09:48 PM   #28
TonyTecson is offline TonyTecson  Philippines
diyAudio Moderator
 
TonyTecson's Avatar
 
Join Date: May 2003
Location: Palatiw, Pasig City
10M45S problem
you still need to add a small resistor in series with the led and connect the gnfb resistor to that resistor.....
__________________
planet10 needs your help: Let's help Ruth and Dave...http://www.diyaudio.com/forums/plane...ml#post5010547[B
  Reply With Quote
Old 6th February 2013, 09:52 PM   #29
jackinnj is offline jackinnj  United States
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
10M45S problem
Quote:
Originally Posted by ikoflexer View Post
Keep the gate resistor 1k
http://waltjung.org/PDFs/Sources_101_P2.pdf

Page 3
  Reply With Quote
Old 6th February 2013, 09:53 PM   #30
scott17 is offline scott17
diyAudio Member
 
Join Date: Aug 2009
Quote:
Originally Posted by Tony View Post
you still need to add a small resistor in series with the led and connect the gnfb resistor to that resistor.....
Yes Tony, that's how I built it originally. A 100R resistor in series with the LED and gnfb applied at that point.
  Reply With Quote

Reply


10M45S problemHide 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
10m45s Steven123 Tubelab 10 8th May 2011 11:39 AM
Ixys 10m45s theskintman Tubelab 0 31st August 2010 11:31 AM
Ixcp 10m45s Wombat 397 Tubes / Valves 14 4th September 2009 12:09 AM
Help needed with 10M45S integration . TugaTweaker Tubes / Valves 11 9th March 2009 07:33 PM
Wtb; 10m45s Cobra2 Swap Meet 9 26th November 2008 05:17 AM


New To Site? Need Help?

All times are GMT. The time now is 12:28 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio
Wiki