Jolida JD9 Upgrade/Mods Clarification. - Page 3 - diyAudio
Go Back   Home > Forums > Source & Line > Analog Line Level

Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 6th November 2011, 01:30 AM   #21
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.
  Reply With Quote
Old 7th November 2011, 09:53 PM   #22
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!
  Reply With Quote
Old 8th November 2011, 10:17 AM   #23
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.
  Reply With Quote
Old 14th March 2012, 09:24 PM   #24
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


Click the image to open in full size.
  Reply With Quote
Old 5th April 2012, 11:28 AM   #25
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?
  Reply With Quote
Old 9th April 2012, 02:07 AM   #26
Face is offline Face  United States
diyAudio Member
 
Face's Avatar
 
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.
__________________
"He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche
  Reply With Quote
Old 9th April 2012, 12:46 PM   #27
diyAudio Member
 
Join Date: Feb 2012
Quote:
Originally Posted by Tony Kopacz View Post
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.
  Reply With Quote
Old 10th April 2012, 10:56 AM   #28
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
  Reply With Quote
Old 12th April 2012, 06:57 PM   #29
Face is offline Face  United States
diyAudio Member
 
Face's Avatar
 
Join Date: May 2007
Quote:
Originally Posted by Bonsai View Post
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.
__________________
"He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche
  Reply With Quote
Old 28th December 2012, 02:15 PM   #30
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.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Cambridge Audio A1 mk3 upgrade mods Honda Z50M Chip Amps 28 1st March 2014 02:08 PM
Proac Studio200 - Upgrade mods help needed stu.dio Multi-Way 2 21st November 2008 02:19 AM
JBL 300.4 amp upgrade/mods ahmisuhairi Car Audio 6 26th September 2007 06:34 AM
Better Sounding Direct Replacement For OPA OP37 In Jolida JD9 Phono Stage XTRprof Analogue Source 5 30th June 2007 10:00 AM
jolida JD100H upgrade maya1 Digital Source 0 30th April 2004 04:10 PM


New To Site? Need Help?

All times are GMT. The time now is 04:14 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2