a9046f9b   
   From: notme@barbarebop.co.uk   
      
   On Thu, 15 Jul 2010 04:15:38 -0700 (PDT), Kruse    
   wrote:   
      
   >On Jul 13, 12:01 pm, notme  wrote:   
   >> hello all   
   >> would welcome advice on a scott 299c bought with 4 6l6 valves, andd i   
   >> would like to fit the intended 7591 valves, i have no manual for this   
   >> amplifier and i note JJ 7591 S  (with base) and 7591 7591A Electro   
   >> Harmonix (without base). can any of these valves do and is there any   
   >> difference? the amplifier to my ear has always sounded slightly   
   >> distorted to me and i hope by fitting the right valves may improve   
   >> things. i have just basic technical knowledge although i am a retired   
   >> wireman so handy with a weller   
   >   
   >Are you positive that the output transformers are original?   
   >Obviously, you need to get a manual that has the wiring diagram.   
   >Also, check to make sure that the new tubes do not have a larger   
   >diameter than the original tubes, as the 7591s sit real close to the   
   >output transformers on a 299C with factory output transformers.   
      
   thanks for your response   
   as you have hi lighted, the closeness of the tube to the transformer.   
   thats another reason why i want to ghange back to 7591, the 6l6 valves   
   that ive got in currently are actually touching the transformer which   
   cannot be good for them with all the extra heat transferred,( i have a   
   leak amplifier with el35 valves and those are not nearly as fat as 6l6   
   for that matter if i plug in a el35 into the socket there is a gap of   
   4mm clearance). my real question again is, in that respect is the jj   
   7591 fatter than the electro harmonics 7591, is there a difference of   
   quality between them, does the closeness of the valves eventually   
   cause damage to the transformers? i note from the picture that the   
   latter has not appear to have a bakelight base as the former, and is   
   any of them as fat as the rca 6l6?   
   i feel certain i have the original output trannys as per factory, i   
   also can easily obtain a schematic from various sites, i do note i   
   modification (maybe to do with the fitted 6l6) 330k resistors soldered   
   to the wipers of the dc adjusters.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)