From: xtrchessreal@gmail.com   
      
   I have a DIY amp built to Marshall 2204 circuit specs that is about 15 years   
   old now.  I use it at my gigs. I want to experiment a bit.   
      
   A couple ideas I have barely researched but have in mind:   
      
   Add a post PI volume pot - Without seeing a schematic I believe this would   
   allow clipping in the PI while attenuating the AC signal from the output tubes   
   without affecting the negative bias.  The result being a nice control over   
   clipping distortion    
   without having to go deaf.  There may be more examples but I think Triode   
   Electronics has a Mod like this for sale.   
      
   Attenuating the NFB - Simply adding a pot to do this seems easy but I know   
   there are risks with oscillations.  Any suggested pot values to use safely?    
   What about caps to help filter RF oscillations?   
      
   I'm curious what known issues there may be that could damage my amp, assuming   
   the mods are done properly.  I have an O-scope and DMM to test with, what   
   should I be looking for and where?   
      
   I wonder what other mods I could play around with to achieve some amp   
   distortion?  I have room to add more preamp valves.   
      
   Anyway I ain't got money but I do have time - quarantine time.   
      
   Thanks for any direction to help make this possible.   
      
   X   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)