Modifying a tremolo circuit in a vintage Magnatone...

[kage1974]

Hello again. This time I have a question about modifying the tremolo circuit in a Magnatone M9. Is there a way I can tweak the circuit to broaden the range of the speed control? Even when turned all the way down to it's slowest setting it's still pretty fast and I wouldn't mind it being a little faster when all the way up... I've attached the schematic. Any input would be greatly appreciated. Thanks.

[roughcut studios]

tremolo speed mod

To speed up the tremolo, try changing the .02 cap in the tremolo oscillator circuit to a .01, (smaller=faster). To broaden the range, try a 1 meg speed pot. Tremolo circuits need to be tweaked pretty much by trial and error. Just remember to make only one change at a time, so you can tell if you are going in the right direction. I've found it's hard to get a wide range of both speed and depth at the same time with some circuits. I would be glad to hear what others have experienced when trying this mod. Jon

[loudthud]

Change the pot to a 1 Meg and the 220K in series with it to 120K or 150K.