BEST HARMLESS/SIGNATURELESS SPEAKERS CAPACITORS.

Dear friends : Yesterday by advise of J.Sadurni that's a close friend of mine and horn speaker manufacturer i wired again the pure silver ribbon inductor to the speaker woofers and it's the first time that that " less is more " does not works because with the inductor in the crossover the sound of those woofers arrived to better definition, now it's obvious why ADS used the inductor/cap.

I'm thinking seriously to try the same with the tweeter crossover and take out the caps and let the silver inductor only, I know it will be an improvement and yes I know two that I'm changing the second order crossover shape to first order. We will see what happen but with the woofers really function.

In the other side and following with the Levinson 20.6s like a month ago I made other change motivated by the same reaon of the other chages I did it and that's 35 years old amplifiers working hard.

So the amps have  at the electrical power input a board with 4 electrolitic 10K uf caps, this is 40K uf each side. These original caps were made in Germany and out of production but I find out what it need it through athe Germany Vishay manufacturer.

Been the change at the mere electrical input of the amps power supply I really don't have any expectations, I did the change only to preserve in good shape the amps but after a half hour  of play I detected/aware of a true improvement that as improvement always is welcomed.

R.

Dear friends: Btw and due that is the tech-talk forum please read carefully the design engeneering behind this even today marvelous monoblok Levinson 20.6 amplifier that are the ones I use in my audio system and where I changed this year the 3 different stages that came with electrolytic capacitors.

You can see in the first picture that in the first board behind the face plate at its rigth side two caps and the other 2 caps in this board are at the left side and a little below ( each of this caps are of 10K uf. ), then after the 2 transformers are 2 filter caps with 24k uf each one and the last 2 caps are at the rear of the amps and before the signal input board and regulation/protection board these  2 caps are of 9Kuf but due that I can't find out exactly of 9Kuf with the voltaje need it and temperature spec I put down there a pair of 10Kuf Kemet the other electrolytic caps are Vishay under spec voltage and temperature. This last parameter is way important because the amps runs at an average of  85°-90° continuous.

The amplifiers after half an hour you can't tocuh the heatsinks and even the face plate ( almost 1" tickness. ) that is crewed to inside a metal plate is more than warm I can say hot after an hour and that so continuous high temperature is an enemy to any passive parts but especiallly to those electrolytic capacitors that were running in that way 35+ years in a row with out fail, so I changed for the amps can be " safe " and in good shape operation.

Look, in the signal input board goes 4 resistors ( the signal does not pass through. ) that for some years I wanted to change due that at sigth it looks almost " burn-in " as the teflon board where are soldered so I changed too for new Vishay military spec ( all passive parts in the amps are military specs and are specified that way in the circuit diagrams that fortunatelly I own. ) the temperature spec for those resistors is 250°.

The design was made it mainly by J.Curl and if you read carefully a " bible " for amps design A gem of amps and that's why I still own:

Read at page 64:

https://worldradiohistory.com/Archive-All-Audio/Archive-Audio/80s/Audio-1987-08.pdf

Here why I still own my L 2030 ADS speakers subject of this thread instead to buy new speakers. In my Agon virtual system are all the tweak changes to mantain fully competitive its QS today:

As the amps a statement of audio items:

R.

Btw, obviously the amps electrolytic caps just behind the face plate are axial type due that are low voltage and the others that are high voltage are screw type.

In the review of the amps we can read about the mother board but with out any other information and that mother board is located just after the below plate that covers all the amp and as its name describe everything is soldered directly or screwed to it. The mother board has the same dimensión than the amp  wide/length. Just a beauty of board design !  At least for me.

R.