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In the Forum: Melquiades Amplifier
In the Thread: Super Melquiades Amplifier.
Post Subject: Re: Bingo!!!!Posted by Thorsten on: 7/19/2005

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Hi,

 Romy the Cat wrote:
After some experiments and still being dissatisfied with the HF I ended up consulting with Dima.  He spread me a theory according to which the HF was killed by my coupling Silver Mica cap. All my arguments that silver mica work OK he demised claming that it is known how mica works in parallel application but generally people do not use it is serial application.


What you get with Silver/Mica is an extremely transparent capacitor. It is much free'er from electrostatic effects, microphonics etc. than any other type. The dielectric is a notch or two above polypropylene as well.

 Romy the Cat wrote:
Dima made me, contrary to my weak protests, to bult my own Cupper Foil with Teflon cap that I most likely will try soon in the HF channel. Perhaps air or vacuum will be next.


Careful. Copper Foil tends to have sharp edges and teflon flows. In my experience any sensible assembly of PTFE & Copperfoil ameanable to DIY shorts out rather sooner than later.

 Romy the Cat wrote:
I placed between the stages my default 2uF Cube 950 (with speaker lever crossover) and it was like return back to home after a long journey.


It may very well be that to get the sound you require the "sound" of the specific capacitor AND of the speaker level X-Over is needed. In fact, replacing a 1st order speaker level X-Over with a 1st Order line level X-Over does NOT result in the same level & phase AT ALL (because any driver is a reactive load), you need to completely redesign the X-Over frequencies to get the match back.

 Romy the Cat wrote:
Frankly speaking I so love the Cube 950 that if I get the correct value I would not even experiment with anything else. The lower value I can get might be 1000pF (.001uf) that would require 40K bias resistors. I do not think I might go so low…


40K should be no issue. Otherwise, two 1nF Capacitors in series make 500pF.

 Romy the Cat wrote:
I really begin to hate all of thing! When will that all soldering stopped!!!?


Given that nothing is ever perfect and that we seek perfection as well as new experiences, I suspect you will stop soldering either when you give up seeking the new and the perfect or when you are safely six feet under, whichever comes first.

Ciao T

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