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Just in order to summarize this visually - note the different positions where the wires are soldered to the caps:

Hum:

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No hum:

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Yes, i know, old thread:



Do You have an idea what makes them so loud?
The stack below is so loud (with the M40) that i could even have used it open air as a bass amp instead of the G-2000...

Well, actually old, but i did a few measurements on the TM018. Inductance, with a simple multimeter (Peaktech 2005). Measurement frequency apparently 200 Hz - the manual is not really clear about...

Joseph,

exactly that was the impression from my prototype with the thick wire. But nevertheless the 6 mm² loop of my prototype produced an at least reasonably balanced signal. Despite of that i do...

Whis is exactly what i did. My description on the differences between the signals were based on these. Even for the Primavera, where the loop is larger, overcompensation is not an issue.

These...

mhmm, but that does not explain, why one loop humbucks and the other doesn't.
I still wonder if it is a question of loop geometry.

The Sharkfin is Bass 1. Primavera is Bass 2 and looks like that:

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last question first: the cavities and the channels are unshielded. Still unshielded. Will be done later when i make the...

Which didn't have any effect in the 2nd case. But a strong one in the 1st.



I'm aware of that. The wavelength is irrelevant at any frequency of interest. That's why i specualted on interference...

Unfortunately not success at all in the other bass. Same pickup, different coil geometry.
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The noise even increases. On the scope the noise signals from the loop and from the pickup seem...

Success. Here some pictures - one turn, 6mm², Talema AX-1500, due to the small cross section of the loop. Sound slightly darker than without the loop, but that might easily be a feint caused by the...

That's what i actually expected when i thought about the idea the first time - but i wanted to try. (And it was fun to see an autotransformer actually transforming upward on the scope).

As i don't...

I just tried the transformer idea, using a Monacor LTR-110. This is a fairly cheap yet still good line transformer with a secondary for 1:1 and one for 1:0.5. connecting them and using them as an...

And that's why i'm considering using a transformer.

Actually one of my target basses has the J-pickup so close to the bridge that it would profit of a lowering of the trebele resonance frequency.

Recently i tried to run half of a split coil PU with 3850 kOhms DCR in series with the pickup. not full cancellation, but it worked reasonably well with only a small effect on the voicing of the...

Concluding: the idea should work. It might, however, be useful to simply use more turns on the transformer, maybe 1500, and just one single loop. In conncetion with a High-Z pickup the impedance and...

The circuit does not yet exist. The idea was using an "arbitrary" compensation coil and feeding that with inverted phase to an OpAmp based adder stage and doing the fine adjustment through the input...

Just continuing the speculation a bit: if i chose the active way, i will run into trouble as soon as i manipulate the treble resonance of the pickup (which i intend to do...); the dummy loop should...

No, the pickup has 6k DCR and hence heve something in the range of 5000-8000 turns. I did my estimate with 6600 turns.

Unfortunately the cavity is the only place for a dummy coil.

BTW: i am...

I'm aware of the Illitch concept and similar approaches. But there is not enough space for such a large loop - it must fit into the e-cavity of that bass, which is in its upper horn:
...

Yes, i would go in series. If i want to use a 500 turns Talema i would need to fold a large loop into 2 or 3 turns but use the Talema only on one of the turns, wouldn't i?





At least in the...

Hi, maybe the question / the idea might sound absurd - but it should be possible to use a loop/CT device for hum cancellation, shouldn't it?

Background: i have just built two basses, both with...

What do You mean by static?

I am running a 500 turns LoZ pickup with a 2.5-k-Pot (and a C-Switch), into an assymetric cable. No probs. But it was also ok, when i sent the signal through a...

Sitting in front of my Devuan ASCII loaded desktop i wonder about the secial advantage of a distrution like MX... XFCE is available on most larger distributons, especially al Debian derivatives...

Well, i needed to make a short break with this and hope I'll get back to it over the weekend.

All correct and not at all in contradiction to me. You can query for both current and voltage directly at the screen node.

Veff^2/R can be done at the final load resistance and hence be used to...

Correct. That's why i called it "marketing value". My problem is actually that the 2nd approach which was the attempt to do the correct formulation, in some situations gives reasonable values which...

And again - modeling something like the power on G2 of pentodes is important but estimating that power is hard to do manually.

fails. Or i did not guess the syntax correctly.