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Club Sadowsky!!!

Single coils are always the benchmark. When you work on a hum free design, you are trying to get as close to a single coil sound as possible. If you mostly play with both J pickups up full together, they humcancel 100%. You only get hum if you favor one pickup.

We now have developed our stacked hum canceling J pickups that can be fitted with a switch to turn off the bottom coil to get a true single coil.

Roger

Wow, I see at last! So I don't have any chance removing the hum using one single coil PU with upgrading the shielding? It is taken out from a Chinese Metroexpress loaded to my Blade Penta.
 
Single coils are always the benchmark. When you work on a hum free design, you are trying to get as close to a single coil sound as possible. If you mostly play with both J pickups up full together, they humcancel 100%. You only get hum if you favor one pickup.

We now have developed our stacked hum canceling J pickups that can be fitted with a switch to turn off the bottom coil to get a true single coil.

Roger

Will these new pickups be available in the German Metrolines, or as an after market purchase?
 
Will these new pickups be available in the German Metrolines, or as an after market purchase?
Are already in the German Metroline MJ bass 5 string.
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Will these new pickups be available in the German Metrolines, or as an after market purchase?

Different j-style pickups pickups are already available through Warwick, at least for 5 string basses and including stacked coil design:

Single coils: Sadowsky J/J-Style Bass Pickup Set, Single Coil, 5-String - Bridge & Neck
Split coil: Sadowsky J-Style Bass Pickups (Alnico V / Alnico III), Noise-Cancelling, Split Coil, 5-String
Stacked coil: Sadowsky J-Style Bass Pickups, Noise-Cancelling, Stacked Coil, 5-String
 
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My limited knowledge of recent Sadowsky pickup changes:

1) The 5-string stacked jazz pickups were first introduced in NYC instruments in 2018. They improved hum cancelation from the previous side by side 5 string jazz pickup. I had an NYC instrument with the side by sides and got a lot of lighting induced hum, so Roger swapped them out for the stacked version and the problem was corrected. I'm not sure if the stacked 5 string pickup ever found their way into the Japan Metros or Japan Metro Express, but I assume they did find their way into the Warwick instruments.

2) Later, in 2020, Roger introduced the switch ($100 upcharge) that removes the stacked hum cancelling pickup from the circuit, making the installed pick-up into a single coil. I had Roger install this feature into another NYC bass and my experience was that, once adjusted for a gain bump in single coil mode, I could hear no difference between the single coil and hum cancel modes of operation. YMMV. A testimony to the quality of the stacked pickup quality and design.