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In the Forum: Melquiades Amplifier
In the Thread: Planning my DSET
Post Subject: Now that I have had a good look at them...Posted by anthony on: 7/9/2015
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 Romy the Cat wrote:
What do you mean the example of inductive Lpad? All speaker level Lpads are inductive. The speaker level Lpads work with low voltage and high current and therefore they use wire wound restive elements. Any wire wound components are inductive by nature. In fact most of the non wire wound resistors are inductive and you need to pay premium to get not inductive resistors if you need it. I do not know if cheap Part-Express Lpad would be more inductive then some kind of super-expensive Lpad from other brand. They are inductive not by "bad or cheap making" but by topology of restive wire wound restive element. BTW, I had a few vintage German and British LPAD that I fished on eBay and they were way more inductive then the contemporary LPADs. They were not better sounding ether.

...I see what you mean.  I found some images of the insides of some of these speaker level L-Pads and they certainly do look like they are inductive.  I understood the wiring technique used to make wirewound resistors non-inductive and I assumed that this was available for speaker level L-Pads as well.  

One question that I still have regarding the L-Pad on the MF Channel is why you did not lose more gain at the filter before the MF driver stage?  By my reckoning a resistor change here would shunt more signal and you would possibly not need the S102 resistors at speaker level.  Of course you may have just experimented and found a solution that worked well enough and left it there...or I may have missed something.

Romy, I see that you are a fan of the air-capacitor at high frequencies.  It has been interesting reading about where you have been successful (or not) with them and what you have had to do to get them to work.  Intriguing even.  If you don't mind me asking, what do you look for when selecting an air-capacitor?  This is all foreign to me.  There are variables such as construction material, number of gangs, air-gaps and voltage ratings.  I would assume that it is important not only to shield them from RFI but to seal them so they remain clean.  Would you care to reveal your source for these caps?

Regards,

Anthony 

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