Me too long time didn't hear any news from you, great to hear you have MOD the clock, i actually want to change clock too, but i heard bad thing about it, if MOD it wrong, the CD player will gone.... :cry: (scare) it look clean n nice, :wink: . Now i waitting for the RIKEN resistor from hong kong.
i have ordered the ad797 op-amp it's expected to collect it next monday.
hope that can reduce the noise and give better clarity after i replace the old 2604. the cost of changing is RM 136.00 it is almost RM100.00 cheaper then BB627.
i had changed the the ad797 op-amp when i first push the power button, the cdp was not responding, so i tried turn it off and on again the result is the cdp turn off automatically after count down to 11sec. the third time is until 4sec and following time is it turn off after count down and "no disk" showing. finally, it can be turn on and play cd and it seem like normal.
the ad797 sound is totally diferent from bb2604, it's really ultra low distortion i can said, bass is not as powerful as bb2604, vocal is much more natural, high frequency positioning is more accurate and clear. i can feel like playing LP with this ad797, it's can let you have less digital feel.
but i guess bb627 sound can give me more satisfication rather then ad797.
since i haven't try bb627 in my cdp so i still can give any advice here.
the cd-rom tray ejected but no display from the lcd after i pushed the power button when i check the cdp this morning. second time it's worked.
so i will change back to bb2604 and see is this problem cause by the ad797.
can you show which point is connect the grounding with PCB broad.
I have try AD797 but no any problem occurred same to you. I thick just grounding problem.
can you show which point is connect the grounding with PCB broad.
You can see sperwhite's cdp show before the grounding connected with MHZS cd33' PCB.
ha..becareful while clean the laser lens, don't like me spoil it.... if after cleaning still not ok. then change back to opa 2604 still not ok... then maybe your CD pickup had show aging. Last time u said ur cdp can't read all CD right? did u replace a new 1 last time?
I think china made cdp use the loudsy sony kss-213, if your luck good it may last 1-2yrs, if bad luck 3month can see some sign/symptom....
lucky Jln pasar is selling the cd pickup mechanism (include motor) at RM22, 1 year change 1 time also no problem.....
dear all,
my cdp look like no problem already, i had tested it for 18 hours yesterday and it's didn't give any problem like before to me. so i guess it's just a minor run in problem.
i had shared some of my view about ad797 before based at lower volume cause i test it at midnight. yesterday i test it again evening and i turn the volume at "normal listening dB". may be the ad797 had been burned-in for one day, the result is much much much more better. bass is more natural it's not so soft but also not so hard, just nice to me at my system. the detail od the high frequency is clear and better positioning. but i really like its vocal, vocal really natural and give me the high end system and live feel. finally is the distortion of this ad797 is extremely low.
thanks for your helping and sharing your knowlegde with me.
you can find it at this web site in hk:
http://www.review33.com/avforum/
My DAC-ah is heavy modified by me, if your friend new hand on diy, I suggest a little bit to modifity is ok la !!!!!!!!!!!!!!!!
costs HK$350
re-correct the curiscit of outup. $10
changed some e-cap and outup cap $200
changed opm to BB627ap $100
just to check with u, normally the opa 627 will use together with 2 coupling cap, u r using 0.1uF right? some are using BG0.47uF NH hi Q, which value Do u rcomend for 627bp? So using BG or other film foil cap better?
2 coupling cap, u r using 0.1uF right? some are using BG0.47uF NH hi Q, which value Do u rcomend for 627bp? So using BG or other film foil cap better?
if use more value the bass will be stronge.
BG is very ok la!!!!!!!!!!!!
film foil cap must use high grade, then the cost will high than BG.
speed is fast than BG.
I suggect film foil cap. I am using Muscial Cap 0.1uf/400v now very good.
than BG 0.47nh hi q should suit me... hovland music cap is quite expensive...
do u think TL072cp can be replace by opa 627 or opa 2604?
the TL072 is the opa in my audiolab amp, and the 2 coupling cap is 0.47uF/63v, so if i change it to larger uF bass shall inrease right? thinking change it to 1uF so taht bass extension more....
I understand that Lite dac-AH also got blank board to sell.
May i know:
1) is Hk have this type of blank DAC-AC board sell?
2) Is this blank Dac-ah contain the 8pcs TDA Chip on board or it is totally blank/empty?
I found BC/philips 030/031series is also cheap and nice e-cap, i prefer this than the panasonic FC.
dear all,
:cry: :cry: :cry: :cry: :cry: :cry: :cry: :cry: :cry:
Once again my cdp having problem after I changed back BB2604 op-amp, yesterday I was tried to install the origanal op-amp (BB2604) and the cdp totally can't be switch on, the tray was ejected but there is no display from the screen. At last I install the AD797 after I tried for a few times, the cdp was not so reliable, first few times it's also given problem until this morning I try, it's still not perform as normal. The problem now is sometimes it's working sometimes it's can't be switch on, I have to on and off for few time only it's able to be switch on.
I have no idea which path of the cdp is giving problem since I used back the BB2604 it's also can't be switch on. :?: :?: :?: :?: :?: :?: :?: :?: :?: :?: :?: :?: :?:
check all the connection (i found this type of china made board not reliable, the most u dissemble n assemble than more problem...), check your cdp ribbon cable connection and use multimeter to check the ribbon cable. There is 1 time i found 3 cable insdie the ribbon cable break but can't observer visually, it is a haie line break... so some time can play sometime can't....
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