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Cyber Twin selector knob.

I have a Fender Cyber twin. WHen I turn the large preset selector knob, it flies through the presets. Sometimes if I turn it slow enough it will go through the presets in order, but other times it will skip three or four presets.

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  • kristian_ost
    kristian_ost Jan 25, 2012

    I am having exactly the same issue with my amp and it has nothing to do with how fast i turn the knob like Myreltech suggested. Mine skips around completely at random, back and fourth like some sort of lottery.

    Anyway, I'm wondering if you every fixed the problem and If so what it entailed or cost. Thanks!

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I can almost guarantee the interal contacts of the rotary selector have oxidized over time. Getting to that control is a real pain since several printed circuit boards must be moved to get at it. What i usually do isunpojug the amp, lay the amp on it's back, pull the plastic knob off of the rotary selector control shaft, fold over a paper towel about 6 thicknesses, punch a small hole through the center of the towel, place the towel over the shaft and push it down to the control face (this catches overspray) then spray Caig DeOxit DN5 between the shaft and the outer ring of the control. Let it soak in while you twirl the knob round and round, back and forth. This cleans the oxidation from the internal contacts. It may take a couple of squirts and lots of twirling but it should get the control back to proper operation.
Barry

Posted on Dec 27, 2012

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The selector knob may be a potentiometer or a rotary impulse giver device. In any case, it looks like the internal contacts are either dirty or oxydized so the value is changing in an erratic way which causes the unit to skip several presets at a time.

It would require a skilled technician to disassemble and clean the controller (if it can be disassembled in the first place), otherwise you will probably need to replace the preset selector knob entirely.

Regards,

Triarcuate

Posted on Oct 18, 2009

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There is nothing wrong and what you are seeing has nothing to do with a faulty control. The Cyber Twin Preset selector is a digital control that senses how fast you spin it. The idea is if you spin it faster the amp assumes you want to get to one of the hundreds of presets faster and it purposely "skips" blocks of presets until you stop or slow down the spin rate. If you turn it slowly it'll select one at a time in order. When in edit mode it'll do the same thing when you dial in effect values so just dial stufff in a little slower till you get the hang of it. It's a nice feature once you know what to expect.

Posted on Dec 07, 2009

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