Hi to all. I'm working on my first CBG and so far I'm pretty happy. Cohiba box, maple neck, all fretted. Now comes the pickup. I've made a 4 poles pickup. 9000 turns, the load is near 5K. That's a start. I have potted the pickup and ready to try.

So I've just hooked the pickup directly to a pair of wire, through a jack, and connected to the amp. Ita a Fender Super champd XD tube amp. My problem is that I hear this feedback every 10-15 sencods and it lasts a few seconds. Any idea why ?  I have attached a sound clip, take a moment to listen to the whole 50 seconds of it.

Many thanks for your help.

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well I tried shielding the pickup only to the common ground and no changes. So now I tend to think like Mark. I even get the hissing when I touch the tip of the cord jack with my finger. Maybe I'm just discovering something that always existed. So I will put all the bits together in the cigar box and we will see. 

Any other thoughts from anyone is still welcomed.

Did you put any insulation between your mag poles and the wire? Like Scotch tape. Or is the wire directly against the mags? You waxed it for about 20 min?

Yes I used teflon tape, for about one to 1 and a half turn between the alnico and the wires. Also the potting lasted about 30 minutes, until I would not see any air bubbles anymore. Finally, I installed the pickup in the CBG and the noise was less present. Still there but very light. 

The middle strings are pretty well amplified but not the lowest string. I rechecked the polarity of the whole pickup (installed) with a compass and there is not much pull on the needle. I had magnetized the mags before winding the pickup. Now my next plan is to remove it and re-magnetize it again and recheck polarity. 

Having fun !

I would recheck yer Ground Connections

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