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In the Forum: Melquiades Amplifier
In the Thread: Planning my DSET
Post Subject: Better air-caps?Posted by Romy the Cat on: 7/9/2015
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 anthony wrote:

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.

 
Sure, it is completely makes sense to put a Lpad before the Milq driver. There are two “conditions” however. The impedance before the driver is used for bias, so you would need more resistors to separate bias and load-constant attenuation. And the last is that in my situation, with my MF tube and my S2 driver I still feel that mild” but very well controlled inductance is beneficial to my sound.
 anthony wrote:
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?

 
I look only for size per volume and ability to hide them. There is some belter air-capacitors, some of them silver with holes, just open some top of the liners HP, or Textronics of RS from 80s. I don’t try them however for sound.

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