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Dave A

electrolytic capacitors

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1 hour ago, Jeffrey D. Medwin said:

One must KNOW what cap uF values play in what music ranges, when doing multiple bypassing.  One must be sensitive to the quality of playback, in any given area, for any given uF value !!  Formulas and math, need not apply !!! 

 

Math absolutely applies, Jeff.  You're taking your "artful" experience bypassing inside an amplifier, where the impedance levels are much higher than in a loudspeaker crossover, and stating that the same values of capacitance will "cover the same musical ranges" when as a matter of FACT they absolutely CANNOT!

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35 minutes ago, glens said:

 

Math absolutely applies, Jeff.  You're taking your "artful" experience bypassing inside an amplifier, where the impedance levels are much higher than in a loudspeaker crossover, and stating that the same values of capacitance will "cover the same musical ranges" when as a matter of FACT they absolutely CANNOT!

 

 

No, not really !!!  That is actually not my direct experience.  A 0.68uF covers in a loudspeaker crossover what it does in an amp. And the same applies to all the other typical  uF values I might be using.

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8 minutes ago, Jeffrey D. Medwin said:

A 0.68uF covers in a loudspeaker crossover what it does in an amp. And the same applies to all the other typical  uF values I might be using.

 

Do you even know the relationship between capacitance, frequency, and impedance?

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1 hour ago, Edgar said:

 

Oh, I really like that. Simple and concise. That's going into my stockpile of retorts.

It's something my dad would always say when I started to get louder during a disagreement.

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1 hour ago, Edgar said:

 

Do you even know the relationship between capacitance, frequency, and impedance?

 

Vaguely, but such things do not hinder me from trying and listening, as it does to you, and others. That is how and why, I can achieve results others will NEVER ever possibly get !! 

 

A L.S.E.S. power supply filter to the Finals, with less than non-critical inductance chokes, is a well proven ( since 1989 ) stellar example of this !!   It walks all-over what EEs think they know, on how to design a tube power amp power supply.   " Most E.E.s are unconscious about power supply design, but good ", Dean of E.E., Univ. of Alabama, Dr. Charles A. Halijak, in his 1987 letter to me. 

 

Its fun, and yes, IMHO, there is only ONE way to tube amp design excellence :  It is two tube stages, Single Ended, direct coupled, multiple film cap bypassing, GOOD wiring, and a L.S.E.S. power supply filter.  Nothing............remotely equals that .   Requires use of sensitive highly efficient, quality speakers !!  

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8 hours ago, Dave A said:
8 hours ago, Dave A said:
22 hours ago, boom3 said:

The four lead box looks good for a PCB based crossover. 

OK could you tell me what that means?

 

Printed Circuit Board. A four lead component can be mechanically more stable. The WIMA box caps are indeed very good and very popular with rebuilders of vintage guitar amps to replace Orange Drops, Black Beauties and the like

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Jeff, no math or science? How did we even get to have these components without them?

 

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1 hour ago, Jeffrey D. Medwin said:

Vaguely, but such things do not hinder me from trying and listening, as it does to you, and others. That is how and why, I can achieve results others will NEVER ever possibly get !! 

 

You shouId not do magic you do not understand!

- The Indian in the Cupboard

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1 hour ago, Jeffrey D. Medwin said:

I can achieve results others will NEVER ever possibly get !! 

 

Of that I'm sure!

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Date: Sun, 23 Feb 2020 15:33:02 -0800
To: Jeffrey Medwin <drlowmu@gmail.com>
Subject: Au revoir.....and a warning 

Regrettably, the time has come for our recently rekindled romance to come to an end.   Accordingly, you can continue to believe in sonic ghosts and magical cures, and I will continue to believe that you are totally nuts.  That having been said......and now on a serious note...... I offered to take a look at your Bravura because I assumed (correctly) that you were not responsible for its malfunctioning condition.    However,  even though your Bravura has been repaired and is now functioning properly, rather than simply enjoying the spectacular sonic performance that it has to offer,  you seem to be intent on d****ing around with it in an attempt to improve its sonic performance.   Aside from the fact that from a technical perspective you don't know what you are doing, I want to leave you with the following warning: ......If in the process of d****ing around with your Bravura, you **** it up, don't come to me for help because from here on you are on your own,     

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Jeffrey, I have my basic crossover layout done. Can you tell me if this looks right?

DSC_0017.JPG

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  • Haha 3

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28 minutes ago, Dave A said:

Can you tell me if this looks right?

 

Needs more solder.

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3 hours ago, boom3 said:

Printed Circuit Board. A four lead component can be mechanically more stable. The WIMA box caps are indeed very good and very popular with rebuilders of vintage guitar amps to replace Orange Drops, Black Beauties and the like

What I wanted to know was what the four lead thing was since capacitors I have used are two leads.

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15 minutes ago, Edgar said:

 

Needs more solder.

 Once Jeffrey blesses the design I can get busy soldering.

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38 minutes ago, Dave A said:

What I wanted to know was what the four lead thing was since capacitors I have used are two leads.

 

Wima DC Link MKP4s come in 2 and 4 leads, or PINS sticking out of the case.  The 4 Pins ( two pins for each polarity ) are always  better sounding overall,  and more dynamic, if the rest of the circuit is up to snuff, compared to the same value, in a 2 Pin.  So, only use 4 Pins !!   Down load their data sheet. 

 

Go to Mouser, etc.,  and order the 15 uF AT 900 VDC 4 PIN, in particular, that is a great sounding value. It is VERY high, for a single 15 uF, in performance !!   Seems to have ZERO storage time, a hoot to have in the circuit.  On a 25 uF, try to find the smallest sized MKP4, high voltage ( 600 to 900 VDC range ) , with 4 Pins ONLY.  

 

                                                        884981224_2amnd4pin.JPG.fd4f6213b2bd65e72620bfa75ac9310f.JPG

You will " have it ",  as an intelligent purchase, .............but good.

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Great and I will start looking. I have solder and a heavy duty soldering iron on order and thanks for the tips.

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On 3/14/2020 at 4:10 PM, Jeffrey D. Medwin said:

such things do not hinder me from trying and listening, as it does to you, and others. That is how and why, I can achieve results others will NEVER ever possibly get !! 

 

Sigh :rolleyes:

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On 3/14/2020 at 6:02 PM, boom3 said:

Printed Circuit Board. A four lead component can be mechanically more stable. The WIMA box caps are indeed very good and very popular with rebuilders of vintage guitar amps to replace Orange Drops, Black Beauties and the like

Yes, mechanical stability is the key. I used to manage the Honda Design group where we did a "build to print" for Honda Accord Electronics. The Japanese insisted o Single Sided boards with stand up resistors (which were Axial Leaded resistors that had one lead bent 180 degrees that required us to invest in Universal Radial Lead Insertion equipment for their specific line in the plant). The bummer was that the meeting I attended at Universal Instruments HQ in New York state, was literally 100 feet away from McIntosh HQ in Conklin..........so close, yet so far away......LOL.

 

This is why the "minimum etch/maxium copper" method of PCB design is used on Single Sided boards, since the "rivet effect" of plated holes of a double sided board is absent and there is full reliance on just the copper's adhesive (surface area driven) for mechanical robustness. In the same manner, 4 leads are more stable than just 2 on radial components.

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On 3/14/2020 at 7:34 PM, Dave A said:

Jeffrey, I have my basic crossover layout done. Can you tell me if this looks right?

DSC_0017.JPG

There's far too much red. You need more blue and green stuff. Color coordination is important in a crossover.

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