- #1
jordankersten
- 22
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Hello everyone! I have an old Fender Rhodes electric piano I am rebuilding and I have a question. It uses a stereo pan circuit which pans the signal back and forth between the left and right amplifiers. It does this with a simple oscillator circuit that drives two 2N3053 transistors (now replaced with NTE 128's) that switch two light bulbs back and forth which then control each channel via a photo-cell. When the light bulbs get switched OFF, you get a bit of a pop each time. This results in a slight popping or thumping that pans back and forth when the light bulbs turn off. I put 2 68uf capacitors between the collectors and emitters of the 2n3053's and this helped a lot. The popping is hardly noticeable. I am wondering if A) is that safe to put those caps there, and B) if so, can I put in a higher uf cap to completely rid of the pop. I am wondering if this is safe for those transistors. Also, should I be using polarized or non-polarized electrolytics Thanks everyone!
P.S. Here is a schematic of the entire pre-amplifier with the vibrato circuit: http://www.fenderrhodes.com/org/manual/index2.html
P.S. Here is a schematic of the entire pre-amplifier with the vibrato circuit: http://www.fenderrhodes.com/org/manual/index2.html
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