From: phil_a@tpg.com.au   
      
   "Patrick Turner"   
   > Phil said....   
   >   
   > " The Deluxe Reverb is a re-issue."   
   >   
   > ** But no Fender amp is called that.   
   > Kindly post the name printed on the face plate.   
   >   
   > The front plate on amp chassis has Deluxe Reverb in written white   
   > lettering.   
      
      
   ** Not  " Deluxe Reverb-Amp "  ???   
      
      
   > Silver cloth face has "Fender"   
   > Black cabinet, 12" speaker.   
   > The schematic has '65 Deluxe Reverb' and created and plotted dates on   
   > schematic are February and July 1993.   
      
      
   ** So yes - a "Deluxe Reverb-Amp".   
      
   >   
   > Amp has wear and tear and looks 20 years old, but it sure ain't from 1965.   
      
   **  Those 3 PCBs are a dead give away.   
      
      
   > This tiny amount of NFB does hardly anything to flatten the   
   > signal at the speaker. The signal response at has a 6dB peak   
   > at 100Hz and +6dB at 2kHz, relative to 1kHz level. So the   
   > Vo merely outlines the speaker Z which is to be expected..   
      
   **  Err   -  no   
      
    Regular guitar ( and most other) speakers don't double impedance with a one   
   octave change in F above 1kHz.   
      
    It takes 2 octaves, at least.   
      
      
   >   
   > Phil implies moving grid stoppers 1k5 at PCB to tube sockets might do   
   > something, because Fender did it in the past, but such a move would do   
   > SFA.   
   > Maybe **increasing** grid stoppers to say 4k7, 6k8, 10k0 *might* have an   
   > effect.   
      
   ** What ever it takes....   
      
   > But what I done loads the 6V6 with 9.4k a-a above about 30kHz, thereby   
   > stopping the oscillations.   
      
   ** A simple zobel at the speaker output would do as well.   
      
      
   > Possibly this amp could be converted to use EL34,   
      
   ** Sacrilege  !!!   
      
    Conversion to use Sovtek 5881s is OK, though.   
      
    Otherwise, using JJ brand 6V6s is practically mandatory.   
      
    SFA difference between  the two tubes - really.   
      
      
      
   ...   Phil   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)