Jolida JD9 Upgrade/Mods Clarification. - Page 3

Wire Nut · 6th November 2011, 01:30 AM

Guys,
I just completed a couple more mods to my Jolida. I put .22 Sprague caps on the power caps as a bypass & I put in a pair of Caddock resistors. WOW! A big increase in clarity from the resistors and an increase in bass from the caps.

Then I remembered that someone on another forum said that the 12au7's had less output, so I put in a NOS set of Seimen's - the gain went down to closer to what the other components are.

The resistors are a PIA to install so I only put in one set. Maybe I will feel up to putting in the other set next week... but so far - so good! I will post again when I do the other set.

danska · 7th November 2011, 09:53 PM

Wire Nut,

Any reason you used .22uf caps for bypassing the power supply caps? Did you just put two of them in? Also what voltage are those? I'm looking to mod my PSU section next and I've notice others have used 1uf caps.

I'm also looking for what type of diodes to buy to replace the ones onboard as well as that seems to be a pretty common modification. Also which resistors did you replace? Thanks for the help!

Wire Nut · 8th November 2011, 10:17 AM

I used .22 because I had a bunch around from my AR-XA mod, I actually installed four of them, they happen to be 600v. ... but I did order some 1.0 from the net & will install one on the bigger cap as there is still one that does not have an extra cap yet.

Invention · 14th March 2012, 09:24 PM

For anybody that is looking to upgrade their JD9, I made a step by step guide to upgrading the caps, opamps, tubes, and installing dampening material. I hope this guide helps those that are looking to upgrade.

Comments and suggestions welcome!

Step by Step guide

Tony Kopacz · 5th April 2012, 11:28 AM

Good job on the pics and text of the mods. I've got a jd9 also. If I do the mods, what improvements could I expect to hear?

Face · 9th April 2012, 02:07 AM

I have mine modded with CC MR coupling caps, Amtrans AMCH loading caps(not for a novice), and gold lion tubes. Bypassed, or upgraded PS caps and Vampire copper RCA jacks are up next.

IMO, it's a fantastic phono pre. Very versatile due to the adjustable loading switches and high available gain. It also sounds very good, clean and very dynamic. My only complaints are the blinding LED(which will be fixed soon, too) and lack of rumble filter.

Invention · 9th April 2012, 12:46 PM

Quote:

Originally Posted by Tony Kopacz

Good job on the pics and text of the mods. I've got a jd9 also. If I do the mods, what improvements could I expect to hear?

The mods really do take the JD9 to the next level. I was hoping to get "moderate" improvement from the unit but was pleasantly surprised by how dramatic it truly became after I did those 4 upgrades.

The biggest difference was a HUGE increase in clarity. Luckily, it did not make the sound "too bright" but rather maintained the musicality while clearing up the soundstage. The original sound compared to the upgrade can be described as "muddy."

The JD9 really does benefit tremendously by the upgrades and I think it take it into the range of phono preamps that cost $1,000's of dollars.

Wire Nut · 10th April 2012, 10:56 AM

I did quite a few mods to mine, ditto to above, the clarity is really top notch, it is actually "warmer" meaning more tube sound, the imaging and soundstage are better as well. Here is what it looks like now.

Turntable Forum • View image - V-Caps

Face · 12th April 2012, 06:57 PM

Quote:

Originally Posted by Bonsai

LoL - now that is one bright LED. :-0

Can you show a picture of the LED on the inside and the wires to it? Its quite easy to insert a series resistor to dim is down.

For starters try a 2.2k, if thats still too bright, go to a 10k.

From what I can see(need new glasses), it appears there's already a 12K resistor in series with the LED.

Mohan Siribadda · 28th December 2012, 02:15 PM

I intend to mod my JD9 which I bought from a seller at Audiogon. Before I carryout this mod, I need to change the operating voltage from 120V 60 HZ to 220V 50HZ. Can anyone advise me how I should get about on doing the power conversion. I have tried to get the information Jolida USA, unfortunately they have not responded to my request.

9th April 2012, 02:07 AM	#26
Face diyAudio Member Join Date: May 2007	I have mine modded with CC MR coupling caps, Amtrans AMCH loading caps(not for a novice), and gold lion tubes. Bypassed, or upgraded PS caps and Vampire copper RCA jacks are up next. IMO, it's a fantastic phono pre. Very versatile due to the adjustable loading switches and high available gain. It also sounds very good, clean and very dynamic. My only complaints are the blinding LED(which will be fixed soon, too) and lack of rumble filter. __________________ "If it measures good and sounds bad, -- it is bad. If it sounds good and measures bad, -- you've measured the wrong thing." Daniel R. von Recklinghausen

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6th November 2011, 01:30 AM	#21
Wire Nut diyAudio Member Join Date: Nov 2009	Guys, I just completed a couple more mods to my Jolida. I put .22 Sprague caps on the power caps as a bypass & I put in a pair of Caddock resistors. WOW! A big increase in clarity from the resistors and an increase in bass from the caps. Then I remembered that someone on another forum said that the 12au7's had less output, so I put in a NOS set of Seimen's - the gain went down to closer to what the other components are. The resistors are a PIA to install so I only put in one set. Maybe I will feel up to putting in the other set next week... but so far - so good! I will post again when I do the other set.

7th November 2011, 09:53 PM	#22
danska diyAudio Member Join Date: Aug 2011	Wire Nut, Any reason you used .22uf caps for bypassing the power supply caps? Did you just put two of them in? Also what voltage are those? I'm looking to mod my PSU section next and I've notice others have used 1uf caps. I'm also looking for what type of diodes to buy to replace the ones onboard as well as that seems to be a pretty common modification. Also which resistors did you replace? Thanks for the help!

8th November 2011, 10:17 AM	#23
Wire Nut diyAudio Member Join Date: Nov 2009	I used .22 because I had a bunch around from my AR-XA mod, I actually installed four of them, they happen to be 600v. ... but I did order some 1.0 from the net & will install one on the bigger cap as there is still one that does not have an extra cap yet.

14th March 2012, 09:24 PM	#24
Invention diyAudio Member Join Date: Feb 2012	For anybody that is looking to upgrade their JD9, I made a step by step guide to upgrading the caps, opamps, tubes, and installing dampening material. I hope this guide helps those that are looking to upgrade. Comments and suggestions welcome! Step by Step guide

5th April 2012, 11:28 AM	#25
Tony Kopacz diyAudio Member Join Date: Feb 2012 Location: Chicago	Good job on the pics and text of the mods. I've got a jd9 also. If I do the mods, what improvements could I expect to hear?

10th April 2012, 10:56 AM	#28
Wire Nut diyAudio Member Join Date: Nov 2009	I did quite a few mods to mine, ditto to above, the clarity is really top notch, it is actually "warmer" meaning more tube sound, the imaging and soundstage are better as well. Here is what it looks like now. Turntable Forum • View image - V-Caps

28th December 2012, 02:15 PM	#30
Mohan Siribadda diyAudio Member Join Date: Oct 2008 Location: Sri Lanka	I intend to mod my JD9 which I bought from a seller at Audiogon. Before I carryout this mod, I need to change the operating voltage from 120V 60 HZ to 220V 50HZ. Can anyone advise me how I should get about on doing the power conversion. I have tried to get the information Jolida USA, unfortunately they have not responded to my request.