EL509 SE - Page 2 - diyAudio
Go Back   Home > Forums > Live Sound > Instruments and Amps

Instruments and Amps Everything that makes music, Especially including instrument amps.

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 21st December 2012, 10:05 AM   #11
tinitus is offline tinitus  Europe
diyAudio Moderator R.I.P.
 
Join Date: Nov 2005
how about adding some form of integrated but mild and moderate compression and distortion control ?
  Reply With Quote
Old 21st December 2012, 11:11 AM   #12
GeorgK is offline GeorgK  Austria
diyAudio Member
 
Join Date: Jan 2005
Location: Vienna
Quote:
Originally Posted by artosalo View Post
The anode (to cathode) voltage is some 120 V, because there is R5 (22k) as cathode resistor. This means that the DC-voltage at the cathode is some 130 V.
Won't this exceed the maximum filament to cathode potential?

The idea with 2 levels of feedback is interesting, but isn't that potentially counterproductive in a SE guitar amp that is likely to be driven out of its linear range? Guess only listening can tell.
  Reply With Quote
Old 21st December 2012, 11:21 AM   #13
diyAudio Member
 
artosalo's Avatar
 
Join Date: Feb 2010
Quote:
Originally Posted by tinitus View Post
how about adding some form of integrated but mild and moderate compression and distortion control ?
I do not know this.
Can you give an example of such circuit ?

Now the pentode goes distorted when the signal form guitar is at maximum.
And the distortion threshold can be adjusted to lower level by biasing the pentode a bit different way.
  Reply With Quote
Old 21st December 2012, 11:31 AM   #14
diyAudio Member
 
artosalo's Avatar
 
Join Date: Feb 2010
Quote:
Originally Posted by GeorgK View Post
Won't this exceed the maximum filament to cathode potential?

The idea with 2 levels of feedback is interesting, but isn't that potentially counterproductive in a SE guitar amp that is likely to be driven out of its linear range? Guess only listening can tell.
The manufacturer has specified max. Ukh as +120 V...-150V.
Typically there is a lot of safety margin too. I am not concerned about this.

No, these two feedback loops are working fine together and both improve the linearity, alone and together.

I have used this system with Hifi-amplifiers and it seems to work with guitar amplifier as well.
If only the global NFB is used, then the overall stability of the amplifier could be a problem in some cases. In other words; the use of local NFB at the output tube makes a "good" amplifier easier to build.
  Reply With Quote
Old 22nd December 2012, 09:26 AM   #15
tinitus is offline tinitus  Europe
diyAudio Moderator R.I.P.
 
Join Date: Nov 2005
Quote:
Originally Posted by artosalo View Post
I do not know this.
Can you give an example of such circuit ?
a while ago I found this passive compressor curcuit
I dont know if its any good

distortion control I guess is only a matter of overdriving one gain stage
and I suppose it means one more attenuation pot
one to cranck up the gain, and one more after the overdriven tube, to attenuate it again

hmm, and maybe additional adjustment pot or switch, to bring the overdriven tube in a state where its easily overdriven
Attached Images
File Type: gif passive compressor.gif (27.5 KB, 94 views)
  Reply With Quote
Old 22nd December 2012, 02:22 PM   #16
GeorgK is offline GeorgK  Austria
diyAudio Member
 
Join Date: Jan 2005
Location: Vienna
@tinitus: this is a simple diode limiter, I doubt this is of much use in a guitar amp.
  Reply With Quote
Old 22nd December 2012, 07:54 PM   #17
tinitus is offline tinitus  Europe
diyAudio Moderator R.I.P.
 
Join Date: Nov 2005
its probably not the most effective
but being less effective may not be a bad thing at all
anyway, its said that all compressors have flaws

but I guess we have to test it to know
  Reply With Quote
Old 24th December 2012, 06:32 AM   #18
tinitus is offline tinitus  Europe
diyAudio Moderator R.I.P.
 
Join Date: Nov 2005
hi Arto, is this a country fellow man to you ?

Guitar Effects Projects - Richardo's Pages

and theres is a lttle bit here too

http://www.261.gr/limiters.html

dont if if its of any use to you
  Reply With Quote
Old 24th December 2012, 06:48 AM   #19
diyAudio Member
 
artosalo's Avatar
 
Join Date: Feb 2010
Yes, he seems to be.
  Reply With Quote
Old 29th December 2012, 02:09 PM   #20
tinitus is offline tinitus  Europe
diyAudio Moderator R.I.P.
 
Join Date: Nov 2005
Quote:
Originally Posted by artosalo View Post
I do not know this.
Can you give an example of such circuit ?
hey, found a sweet word for you....bass fuzzcaster
  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
EL509 as a CF GK Tubes / Valves 1 9th May 2008 10:25 AM
el509/519 horn150 Swap Meet 2 20th September 2007 09:48 PM
EL509 vs EL519 resident Tubes / Valves 3 15th November 2004 03:01 PM
Rewiring that EL509 cadman Tubes / Valves 1 12th November 2003 06:49 PM
SE amp with EL509/6KG6A (help) NotInTheMafia Tubes / Valves 1 10th December 2002 08:51 PM


New To Site? Need Help?

All times are GMT. The time now is 09:23 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