Cap upgrades

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HarryOOO

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Cap upgrades
« on: 11 Dec 2015, 04:56 am »
Hi Jeff,
I have a Sonic Frontiers Power 2 amp that I want to upgrade the caps on. 
There are (4) 0.22uf 600v and (4) 0.1uf 600v MIT caps I was thinking of replacing these caps with Jupiter copper foils same values.
I also have a Anthem Pre-L 2 that has a Rel Cap 2.0uf 200v coupling cap which I would like to replace with a Jupiter copper foil same values.
I would like your recommendations, the sound is very close to what I would feel is  ideal just a bit  more transparency and naturalness would be the sweet spot.

Also the speakers are Pure  Audio Project Trios 15 they have a Mundorf 33uf that is used in the midrange cross over its a Mundorf MKP and I was  wondering what  you might recommend as a replacement the driver is a full  range Tang Band W8-1808 8" Neodymium Driver again  the sound is very close to ideal just not enough transparency.



« Last Edit: 11 Dec 2015, 02:59 pm by HarryOOO »

Jeff

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Re: Cap upgrades
« Reply #1 on: 11 Dec 2015, 09:49 pm »
Harry,

The Jupiter Copper would be highly recommended.  It will give you everything you are asking for, and more.

Regarding the speakers, taking you at your word.  I say this because I am only going to address transparency.  Replace the 33uF with a Sonicap G1, and replace the electrolytic with a Mundorf MKP.

HarryOOO

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Re: Cap upgrades
« Reply #2 on: 15 Dec 2015, 05:44 pm »
Hi   Jeff, Thanks for the info in regards to the Amp there are several caps  in question, and as a   matter of dollars what cap is more   influential in the sound of the amp.

CF81/(CF83)/CF82 1uf/400v (4 required)
C27/(C26)/(C28/C29 .1uf/600v (4 required)
C31/(C30)/C33 .22uf/600V (4 required)

and the other cap  that I am interested in replacing is the main coupling cap in the preamp which is a 2uf/250v REL cap. I plan to replace with a
2.2uf copper foil could a 1.5uf 600V copper foil be used instead to save dollars the amp impedance is 100K?

Again thanks for all the help.
My plan is to get the amp and preamp optimized and then focus on the speakers.
As I said  the system  is so close to the sweet spot

Jeff

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Re: Cap upgrades
« Reply #3 on: 19 Dec 2015, 06:58 am »
My apologies for the late reply, but AC was down the two times I attempted to view your post.  In between, I have been covered up  :oops:

First, C30, C31, C32, and C33 (the 0.22uF).  Second, C26, C27, C28, and C29 (the 0.10uF)...

The 2uF is a fits all, but the lowest input imps (<25K).  If the two resistors in the output circuit are 1M and 100R, 1uF will be sufficient.

HarryOOO

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Re: Cap upgrades
« Reply #4 on: 21 Dec 2015, 02:45 pm »
Hi Jeff no worries thanks for the response.
The Technical specifications for the preamp list the input impedance as 40K ohms with the output impedance of <135 ohms @ 1kHz all gain settings.
The amp input impedance is 100k with output impedance of 0.30 ohms @ 1kHz
What I decided

Jupiter Copper for the
0.22uF 600 volt critical coupling caps in the amp
and the 2.0uf 250 volt coupling cap in the preamp (will use the 2.2uf 630 volt)

Jupiter HT for the
0.10uf 600volt coupling cap in the amp.

Replace the 33uf MKP Mundorf with SonicCap Gen 1
Replace the 100uf electrolytic with the old 33uf MKP +  68uf MKP Mundorf in the speaker crossover.

To clean up the power supply I will replace the bridge rectifier in the amp with one constructed from 8 amp 1200 volt stealth diodes.
The preamp has already had the diode bridges replaced with some using stealth diodes, that in it self reduced a bit of haze and glare from the sound.
Its a slow process of listening and then voicing the changes.
Thanks for the information Jeff and Happy Holidays to you and Your Family.