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previous: Tony T The patent number is 2,988,706. D.... -- 8/30/1997 12:08 AM View Thread

Re: True Vibrato varistors

8/30/1997 5:57 AM
R.G.Re: True Vibrato varistors
Thanks for the offer, but I'll just order a copy. I didn't know that there was a single original patent on it. This dovetails into the work I have going (well, OK, stalled because of work pressures) on an all-tube phaser.  
 
From the title I suspect that the patent made a big deal out of the "bridge" nature of the Magnatone circuit. The bridge setup is primarily to cancel out the 70V or so swing of the LFO that they needed to change the resistance of the varistors. That's the real problem with those varistors, btw. It takes a BIG change in voltage to make them change resistance.  
 
Glad the boards are working well for you.