[HAM] Unwanted distortion on an L100

[David Damroze]

  Well, switching the 6BQ5s around seems to have changed the level and 
quality of distortion.
  I didn't see any burnt looking resistors or get that toasted component 
smell.
  Should I just replace the 6BQ5s , or , go ahead and replace all of the 
tubes while I'm at it.
  I hesitate to spend to much on an L100 that I spent $100 USD on , but ,
  until I can afford something better it's what I've got.
  Any recommended tube suppliers ?

  David D.
On Oct 10, 2006, at 1:12 AM, Dave Bishop wrote:

> Tubes, caps and connectors.  You might operate all of the switches and 
> see
> whether the distortion is different in any particular configuration.  I
> would open all the Molex connectors you can locate and spray them and 
> the
> tube sockets with De-Oxit.  Then I would lightly tap or wiggle each 
> tube
> with a pencil eraser and listen for a microphonic tube.  Try swapping 
> out V
> 9 and V 10, the 6BQ5 tubes.  You can also trade the 12AX7s and see if 
> the
> distorition changes.  Check out the two cap cans in the center of the 
> power
> amp, C316-C319.   Turn over the amp chassis, and look for darkened or 
> burned
> resistors, particlarly the ones going to pin 2 of the V 9 and V10, or 
> check
> their resistance if you have a meter to see if they are going high.  
> If that
> turns up nothing, post back and the list can suggest more ideas.
>
> Regards,
>
> Dave Bishop
>
>
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