PLAN B analog blog

Hi Peter,

I'm looking at doing this mod on my rev 1.1 Model 11. Based on your description, I'm 
seeing a 5.6K resistor (green/blue/red) to the right of the caps. Is that possible or am I 
looking in the wrong spot? And should the replacement be 3.9K .25w?

Thanks,

Adam


--- In PLAN_B_analog_blog@yahoogroups.com, "(i think you can figure that out)" 
<peter@...> wrote:
>
> The following are directions on how to locate R51 on a Model 11 board
> set.  The intention of this post is improve the self-oscillation of
> the M11.  Note:  If your M11 self oscillates already there is no need
> to do this.  It won't improve it if it's already there.
> 
> Hold the module so that the faceplate faces away from you and the two
> VC attenuatros are on the left side (component side up of the main board).
> 
> Rotate the module slightly away from you so that the face of trim pot
> on thebottom board comes clearly into view.
> 
> About 3/4 on an inch behind that trim pot you'll see three parts.  Two
> are electrolytic caps (both 10uf).  To the right of those is a single
> resistor.  It may be 5.1K (green/brown/red bands) and on later modules
> shipped it's 3.9K (orange/white/red bands).  Underneath the part is
> printed R51.  That's the one you need to concern yourself with. 
> 
> If you Model 11 does not self oscillate, then replace the 5.1K wth a
> 3.9 K.  You can do this by either desoldering the part that's
> installed and replacng that with a 3.9, or using a pair of cuters
> simply cut the 5.1K out and solder the 3.9K on the backside of the
> board to the two pads the 5.2K was soldered to.
>