ampage
Tube Amps / Music Electronics
For current discussions, please visit Music Electronics Forum. New: view Recent Searches.
New: visit Schematic Hell!
The sunn still shines online!

 
Listen to great tunes streaming live right now!

ampage archive

Vintage threads from the first ten years

Search for:  Mode:  

Hard to describe,PI paralel triode.


 
6/14/2000 12:07 AM
Max
email
Hard to describe,PI paralel triode.
Hi everybody!  
 
After re reading the post about the paralel triodes,i tghought of something,first i would make a kind of phase inverter,with variable phase angle,plate normal output going to the first grid of the paralel triode,  
 
and the second output out of phase with the second,of0 to 179°,tuneable by a pot,going to the grid of the second paraleled triode.  
 
I thought of this after reading the part about thickening effect on the sound,due to the slightly different characteristics of the tubes.A circuit like described would affect the tone drasticaly?Like the harmonic content.  
 
If anybody is willing to participate,you're welcome.  
 
I have a concern,bout the variable de phasing effect,i don't know how to do this.  
 
Best regards.  
 
Max.
 
6/14/2000 12:12 AM
Max
email

Hi again,and sorry!  
 
I made a mistake there"and the second output out of phase with the second,of 0 to 179°,tuneable by a pot,going to the grid of the second paraleled triode."  
 
I should have said first.  
 
Best regards.  
 
Max.
 
 
  Friday
Book Of The Day The Ultimate Tone, Volume III by Kevin O'Connor
Have you ever wondered if there is a better way to build a Bassman, Champ, Plexi, an 800, AC-30, Bulldog or Portaflex? Or you wanted to build an SVT with off-the-shelf parts? How about a master-volume amp that doesn’t change tone with the master setting? Everything you need to know is right here, including: proper grounding techniques, wiring methods, and mechanical considerations. Eighteen chapters cover the “iconic” amps everyone knows and loves, with schematics and layouts for each, along with the technical history of the product. Eyelet-board and chassis-mounted tube socket construction is used throughout, for easy servicing and modding. TUT3 is very accessible even if you cannot fully read a schematic and is a "must have" if you are going to build an amp for your self.

Note: The Ampage Archive is an Amazon Associate site. A small commission is paid to the site owner on any qualified purchase made after clicking an associate link such as the one above.
 
6/14/2000 11:18 PM
Don Symes
email

Hmmm... a fixed (once set) phase shift in degrees that doesn't change with frequency....  
 
I dunno....
 
6/14/2000 11:41 PM
Max
email

Hi everybody!  
 
Don"Hmmm... a fixed (once set) phase shift in degrees that doesn't change with frequency...."  
 
You thought of a phaser?If the change is slight along the freq scale it would be ok,but not like a phaser,that would be too much!Five or ten degrees would be acceptable.  
 
I think the dephasing in regard of the first output,would be best made with a delay?  
 
Best regards.  
 
Max.
 
6/14/2000 11:43 PM
Max
email

I'll try with the delay in paralel on my bassman.It's good to have two inputs sometimes.  
 
Best regards.  
 
Max.
 
6/15/2000 10:23 PM
John Kos
email

Using delay will create a variable phase shift with respect to frequency.  
 
John
 
6/16/2000 2:03 AM
Don Symes
email

I haven't read it in a while, but  
 
http://www.obsoleteelectronics.com/The_Archives/21065L_Audio_Tutorial.PDF  
 
may have a DSP approach to phase shift.
 
   Page 1 of 1