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CJ before and after

192.104.37.160
Posted on April 15, 2016 at 09:01:42
cjspu
Audiophile

Posts: 99
Joined: January 18, 2016
 CJ Premier 12 before (1/2)



CJ Premier 12 before (2/2)



CJ Premier 12 after (1/2)-V-Caps CUTF



CJ Premier 12 after (2/2)



CJ Premier EV1 before



CJ Premier EV1 After- V-Caps TFTF


CJ Premier EV1 After replacing two coupling caps V-Caps TFTF for two V-Caps CUTF




CJ Premier 14 before




CJ PREMIER 14 after (1/3) - Mundorf Supreme Silver/Gold Oil



CJ PREMIER 14 after (2/3) Mundorf Supreme Silver/Gold Oil



CJ PREMIER 14 after (3/3) Mundorf Supreme Silver/Gold Oil


CJ PREMIER 14 (1/2) - Changing input and output cables to pure silver cables





CJ PREMIER 14 (1/2) - Changing in the audio path signal the Mundorf Supreme Silver Gold Oil capacitors for Conrad Johnson CJD Teflon Capacitors.





 

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RE: CJ before and after, posted on April 15, 2016 at 10:38:43
Awe-d-o-file
Dealer

Posts: 21037
Location: 50 miles west of DC
Joined: January 10, 2004
 Looks good, how's the sound?

ET
ET

"If at first you don't succeed, keep on sucking till you do suck seed" - Curly Howard 1936

 

RE: CJ before and after, posted on April 15, 2016 at 10:41:03
cjspu
Audiophile

Posts: 99
Joined: January 18, 2016

I would say fantastic, much more spatiality and 3d presentation.

More refined, pristine and real presentation.

love it !

 

RE: CJ before and after, posted on April 16, 2016 at 15:26:57
Duster
Manufacturer

Posts: 17117
Location: Pacific Northwest
Joined: August 25, 2002
 Nice job, cjspu. I noticed no mention of any aftermarket power cords listed on your Inmate Systems page. If you still use the stock CJ power cords, you might consider that aspect of audiophile tweaking, too...

 

RE: CJ before and after, posted on April 17, 2016 at 07:19:14
cjspu
Audiophile

Posts: 99
Joined: January 18, 2016
 Hi, Thanks for the sugestion.


Didnt post the photos but i have changed the CJ Pr14 powercord.

In fact i had to change the position of the tranformer in order to put the power outlet.

You can see that in the photos.

 

RE: CJ before and after, posted on April 18, 2016 at 19:24:30
fantja
Audiophile

Posts: 15518
Location: Alabama
Joined: September 11, 2010
 Beautiful pics! cjspu

do you perform the "mods" yourself?
Audience is a very nice match for after market power cords(PC).

 

RE: CJ before and after, posted on April 18, 2016 at 22:51:13
pc123v
Audiophile

Posts: 225
Joined: February 6, 2014
 Nice. How much did it cost?

 

RE: CJ before and after, posted on April 19, 2016 at 08:53:56
cjspu
Audiophile

Posts: 99
Joined: January 18, 2016
 Hi,


No. it wasnt me who made the moods. It was made by a friend although i bought all the components...

 

RE: CJ before and after, posted on April 19, 2016 at 08:55:42
cjspu
Audiophile

Posts: 99
Joined: January 18, 2016

All the components for the CJ EV1 and CJ PR 14 cost me around 1300 USD.

 

RE: CJ before and after, posted on April 19, 2016 at 09:04:15
fantja
Audiophile

Posts: 15518
Location: Alabama
Joined: September 11, 2010
 You guys have a real talent there in modding.
CJ gear is ripe for mods.

 

RE: CJ before and after, posted on April 24, 2016 at 12:32:52
cjspu
Audiophile

Posts: 99
Joined: January 18, 2016
 Hi,


I wouldnt say mods because i keept all the previous values from CJ either with the capacitors either with the resistors.

I would say a refreshment since these components have more than 20 years...

 

RE: CJ before and after, posted on April 25, 2016 at 23:42:19
fantja
Audiophile

Posts: 15518
Location: Alabama
Joined: September 11, 2010
 Right On!

 

RE: CJ before and after, posted on April 27, 2016 at 20:17:05
Lew
Audiophile

Posts: 10911
Location: Bethesda, Maryland
Joined: December 11, 2000
 Just looking at the photos, I cannot say whether or not I would think the sound quality has been improved, but I CAN say that you are a very neat worker. Your installation looks at least as good as that of the factory, perhaps even better. Congrats on that. Wish I was as skilled in the art.

As to your penchant for Mundorf capacitors, I do like the silver oil and the silver gold oil and their power supply polypropylenes, but I would only wonder whether using ALL Mundorfs might be too much of a good thing. However, you, not I, are the best judge of that. I think those yellow "CJ" film capacitors are re-labeled RELs, but whether they are polyprop film or metallized film or polystyrene film and foil, I cannot say. Some of those, especially if they are polystyrene, might be at least equal to or better IMO than those white Mundorfs, which I think are metallized film types. I've got a few for PS use, haven't tried them.

 

RE: CJ before and after, posted on April 28, 2016 at 02:22:24
cjspu
Audiophile

Posts: 99
Joined: January 18, 2016
 Hi,

Thanks for your post.

The white Mundorf are cheap polypropylene capacitor and come with a big range of values.
I used all polypropylene caps in the not critical locations- the White Mundorf ( MCAP mkp), JANTZEN Cross Caps ( CJ PR14) and Mundorf Tube cap ( CJ EV1).

On the critical locations i used Mundorf supreme silver/gold oil in the signal path of the CJ Premier 14 and in the CJ EV1 i used VCaps TFTF in the Output coupling caps bypassed by Mundorf Supreme and in the intermediate coupling also Vcaps TFTF.

Some critical resistors in the signal path of the CJ Premier 14 were changed by shinkoh tantalum resistors.

I would say that my primary reason to make these changes is the age of the caps, more than 20 years. I think modern capacitors are better than the used old ones.

At least i managed to extend the lifetime of these gear i like so much but i also had a bonus - A fantastic upgrade in the sound !

 

"A fantastic upgrade in the sound !", posted on May 2, 2016 at 11:10:16
Lew
Audiophile

Posts: 10911
Location: Bethesda, Maryland
Joined: December 11, 2000
 That's what counts.

 

RE: CJ before and after, posted on December 6, 2016 at 03:51:50
cjspu
Audiophile

Posts: 99
Joined: January 18, 2016
 In my first post i included now fotos of the recapping of CJ Premier 12 amp monoblocks.

In the critical positions i add V-Caps CUTF 0,15uf 600 V in the coupling capacitors (audio signal - 8 units) and Mundorf Supreme 0,15 Uf 600v in the power bypass ( 12 units).

Also add some Mundorf Supreme Evo and Mundorf Mcap replacing all the other old capacitors.

A new IEC power cord was also installed, replacing the hardwired black cord.

A pure silver cable was also added to replace the cable between the RCA input and the board.

 

RE: CJ before and after, posted on December 6, 2016 at 06:33:42
fantja
Audiophile

Posts: 15518
Location: Alabama
Joined: September 11, 2010
 Thanks! for the update. How does it sound?

 

RE: CJ before and after, posted on December 6, 2016 at 06:38:33
cjspu
Audiophile

Posts: 99
Joined: January 18, 2016

Much more bass ( like a ss), more detail and resolution, more focus and more transparency.

A lot more musical and a lot much clear.

i never tought that with this upgrades the sound could be so much better !

 

RE: CJ before and after, posted on December 8, 2016 at 11:39:15
fantja
Audiophile

Posts: 15518
Location: Alabama
Joined: September 11, 2010
 Absolutely, mods and upgrades is where the fun happens!

 

RE: CJ before and after, posted on December 13, 2016 at 03:11:38
cjspu
Audiophile

Posts: 99
Joined: January 18, 2016
Posted a new photo of the CJ Premier EV1 After replacing two coupling caps V-Caps TFTF for two V-Caps CUTF.

 

RE: CJ before and after, posted on December 13, 2016 at 14:30:33
fantja
Audiophile

Posts: 15518
Location: Alabama
Joined: September 11, 2010
 Very nice! cjspu

 

RE: CJ before and after, posted on January 21, 2017 at 06:06:17
fantja
Audiophile

Posts: 15518
Location: Alabama
Joined: September 11, 2010
 How does the gear sound since the upgrades?

 

RE: CJ before and after, posted on January 24, 2017 at 02:59:01
cjspu
Audiophile

Posts: 99
Joined: January 18, 2016
 Hi,


Just made another upgrade in the Premier 14 and posted some photos above;

-Changed the input and output cables for pure silver cables;

-Changed the Mundorf Supreme Silver Gold Oil in the audio signal path for Conrad Johnson CJD Teflon capacitors.


Before this last upgrade and awswering your question, the improvement was huge. More dynamic, more detailed, better extension at frequency extremes, increased resolution and a deeper bass.

I have to wait for the break-in of the CJD Teflon before giving an opinion...

 

RE: CJ before and after, posted on January 25, 2017 at 04:52:27
fantja
Audiophile

Posts: 15518
Location: Alabama
Joined: September 11, 2010
 Very cool! cjspu

post more pics!

 

RE: CJ before and after, posted on January 25, 2017 at 07:44:38
cjspu
Audiophile

Posts: 99
Joined: January 18, 2016
 i posted the photos above in the first post.

 

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