Modifying a tremolo circuit in a vintage Magnatone...

kage1974 · 11-02-2009, 07:52 PM

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 · 11-02-2009, 10:11 PM

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 · 11-02-2009, 10:24 PM

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

11-02-2009, 10:11 PM	#2
roughcut studios Junior Member Join Date: Apr 2009 Location: boston Posts: 16	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

11-02-2009, 10:24 PM	#3
loudthud Supporting Member Join Date: May 2006 Location: Texas USA Posts: 919	Change the pot to a 1 Meg and the 220K in series with it to 120K or 150K. __________________ WARNING! Musical Instrument amplifiers contain lethal voltages and can retain them even when unplugged. Refer service to qualified personel.

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