Kingslayer motorboat at high gain

[Rockhorst]

I built a 2015 KingSlayer (so the current version) and it works until I crank up the gain to over the last 30 degrees or so of the turn. If I put it right on the edge, I have normal signal for a few seconds and then it craps out into a 'bop bop bop bop bop bop' tremolo/motorboat thing (at about 5 bops per second). I have to turn the gain way down (to about 40%) for it to get itself back together again. What you would call hysteresis. Level and tone controls have no effect on this, they just function as expected. So something craps out at high gain. I built one a while ago that worked fine, so I must've made a mistake somewhere, but I can't find it. Anyone a suggestion what/where to look?

[alanp]

Is it a Riva Aquarama motorboat?

(Sorry, I got nuthin'. The bad, bad, bad joke was too obvious to my twisted mind.)

[Rockhorst]

Jokes lost on me, must be a cultural difference 

[madbean]

Two things come to mind - you diodes are not clipping properly and your op-amp is crapping out at higher gain...or R8,R9 or R10 are incorrect. Also, check your VB voltage.

[Rockhorst]

Right on the money Bean - diode problem
Thanks for helping out

(incidentally, have you gotten my PM/email from a while back?)

[madbean]

(incidentally, have you gotten my PM/email from a while back?)

Yes, sorry I will respond today.