The RTI Audio Film Caps (a.k.a Auricaps) have been in the 2900 for three days now and it appears that the auricap midrange bloom is in process! At least for now, they have managed to compensate for the AD8620's light midrange presentation. This could lead to two rather scandalous conclusions:
1. Auricaps are not neutral.
2. AD8620's provide nice midrange with the right caps.
1. Auricaps are not neutral.
2. AD8620's provide nice midrange with the right caps.
Even more mods
Over the weekend, I replaced every electrolytic cap in the power supply with Panasonic FC's, increasing the capacitance by 20% over stock except the large cap after the diodes which I increased by 100%. I also replaced the 5 stock diodes with FRED's. It still is breaking in but the results are very good. Darker background, tighter bass, and cleaner highs.
This morning I replaced the two AD8260's (IC216 and IC21?) with two AD8066's each coupled at V+ to V- with .47uf/50V BG PK's. I also replaced the Marinco Cryo'd AC plug I had removed. Of course, it is still breaking in but the results are gorgeous. With the PS upgrade, the Auricap "Dutch" output mod and the AD8066's opamps the Denon 2900 sounds stunning! I highly recommend it.
I am going to let things burn in over the next week. My future plans are to replace IC213 with an AD8066, replace the two X-rated caps with Auricaps, and possibly try the Kwak Klock v.7 as a replacement to the stock clock.
Over the weekend, I replaced every electrolytic cap in the power supply with Panasonic FC's, increasing the capacitance by 20% over stock except the large cap after the diodes which I increased by 100%. I also replaced the 5 stock diodes with FRED's. It still is breaking in but the results are very good. Darker background, tighter bass, and cleaner highs.
This morning I replaced the two AD8260's (IC216 and IC21?) with two AD8066's each coupled at V+ to V- with .47uf/50V BG PK's. I also replaced the Marinco Cryo'd AC plug I had removed. Of course, it is still breaking in but the results are gorgeous. With the PS upgrade, the Auricap "Dutch" output mod and the AD8066's opamps the Denon 2900 sounds stunning! I highly recommend it.
I am going to let things burn in over the next week. My future plans are to replace IC213 with an AD8066, replace the two X-rated caps with Auricaps, and possibly try the Kwak Klock v.7 as a replacement to the stock clock.
2900 muting transistors?
hI,
I broke two of the muting transistors on my dvd 2900 when I was trying the remove the muting trans. mod. In my setup I did not like the result, so I want to put them back, but I can't get any of them in the USA. I have tried several other similar transistors, but no luck.
Does anyone have some they would like to sell to me?
Please email me at htguy1@yahoo.com
Thanks
God bless..
hI,
I broke two of the muting transistors on my dvd 2900 when I was trying the remove the muting trans. mod. In my setup I did not like the result, so I want to put them back, but I can't get any of them in the USA. I have tried several other similar transistors, but no luck.
Does anyone have some they would like to sell to me?
Please email me at htguy1@yahoo.com
Thanks
God bless..
Removing the mute transistors have in my experiance always improved things.
There must be something else wrong if you think it sounds worse.
If you want to keep them, there should be many that can do their job, just google on the name and try to find the specs, go to the nearest vendor and he should be able to find you a set that works.
There must be something else wrong if you think it sounds worse.
If you want to keep them, there should be many that can do their job, just google on the name and try to find the specs, go to the nearest vendor and he should be able to find you a set that works.
mute trans...
Hi A8,
Good to talk to you again. The mute trans did make a noticable improvement, but I can't stand the poping noises that result, so I want to put them back. I have tried several different replacements, but no lick at stopping the poping, so I am hoping someone who has taken them off can sell me thiers and save all the trouble.
God bless....
Mark
Hi A8,
Good to talk to you again. The mute trans did make a noticable improvement, but I can't stand the poping noises that result, so I want to put them back. I have tried several different replacements, but no lick at stopping the poping, so I am hoping someone who has taken them off can sell me thiers and save all the trouble.
God bless....
Mark
batam said:
You could try a couple things with the power supply.
1. Replace stock IEC cord with a 4-way braided cable made out of 12 awg teflon coated, silver plated copper and terminated with a Marinco 5266 AC plug on one end and a Marinco IEC 320/15 at both ends. The braid will provide cleaner power and the Marinco plugs will provide tighter bass.
2. Upgrade every power supply cap with Panasonic FC caps (or Black Gates if you can afford them) with 20% increased capacitance over stock. There are only two exceptions. Increase C905 (the big PS cap) from 100uf/400v to 220uf/400uf and maintain the capacitance on the x-rated caps, which you could replace with Auricaps of the same value if you understand the potential risks involved.
3. Upgrade 5 stock diodes (D901, 902, 903, 904, 906) to 4amp/600v TO220 FRED's.
These two upgrades will provide easier flow of power when those low notes demand it.
You could also try the "Dutch Mod" which will provide cleaner, tighter, more realistic bass.
I've done all these mods to my 2900 and I am VERY HAPPY!
op amp for I-V conversion
I am planning on replacing the IV converter op amps for the RL channels
(JRC2068). I would like to use OPA627 but I cannot find any adaptor that goes from 2DIP to a dual SOIC. Does anyone know any such adaptors?
If there is no such an adaptor, what is the next best thing? One candidate is OPA2134, which I will also use for the post filter/amp. Is opa2132 better for IV convesion? Thanks.
I am planning on replacing the IV converter op amps for the RL channels
(JRC2068). I would like to use OPA627 but I cannot find any adaptor that goes from 2DIP to a dual SOIC. Does anyone know any such adaptors?
If there is no such an adaptor, what is the next best thing? One candidate is OPA2134, which I will also use for the post filter/amp. Is opa2132 better for IV convesion? Thanks.
Darryl,
Did you replace the clock and if so - what was the result.
I replaced it with a LCaudio kit, but I am not convinced that it improved things.
First of all, I didn't hear an immediate improvement. On the other hand I got distortions in the picture indication some sort of jitter. But that was with a dedicated power supply. When I fed the clock with the players own PS, the distortion disappeared.
One other matter that complicates things is the chip that you depicted. It's a clocking device. And everything that is sound related is fed a secondary clock signal from this chip. The question is - how much does it help with a better clock with this device in the clock chain? In my case - where I hade invested heavily in PS improvement before the clock was installed - I suspect that the upside of replacing the clock wasn't very big.
But I would like to hear your result.
Did you replace the clock and if so - what was the result.
I replaced it with a LCaudio kit, but I am not convinced that it improved things.
First of all, I didn't hear an immediate improvement. On the other hand I got distortions in the picture indication some sort of jitter. But that was with a dedicated power supply. When I fed the clock with the players own PS, the distortion disappeared.
One other matter that complicates things is the chip that you depicted. It's a clocking device. And everything that is sound related is fed a secondary clock signal from this chip. The question is - how much does it help with a better clock with this device in the clock chain? In my case - where I hade invested heavily in PS improvement before the clock was installed - I suspect that the upside of replacing the clock wasn't very big.
But I would like to hear your result.
Hi All,
I got a modded plan from mrdon. So far I just replace the 100uF/400V with a Rubycon 100uF/450V but I have questions for the rest of mod of the PS capacitors. Should I replace them (I mean all of capacitors) with Rubycon ZAs/ZLs or BG Non polars? I have been told that I replace the superclock with its PS the sound will dramatically change. Therefore, if anyone had done it I would appreciate your share with how to do step by step since I am newbie in this DIY forum. Thanks in advance.
I got a modded plan from mrdon. So far I just replace the 100uF/400V with a Rubycon 100uF/450V but I have questions for the rest of mod of the PS capacitors. Should I replace them (I mean all of capacitors) with Rubycon ZAs/ZLs or BG Non polars? I have been told that I replace the superclock with its PS the sound will dramatically change. Therefore, if anyone had done it I would appreciate your share with how to do step by step since I am newbie in this DIY forum. Thanks in advance.
As a practice run to modifying the 2900, I replaced the front channel op amps on my Audigy 4 pro sound card, a JRC4556, with an opa2134 (I have never worked with surface-mount components before). The improvement is tremendous. Gone is the muddy and strained sound. The sound card uses CIRRUS 4398 DAC, therefore has a lot of potential. The performance far exceeds the stock 2900 in both cd and dvd-a.
I am very much encouraged by the performance of 2134. But I cannot find any infomation about the PCM1790. If it is comparable to 4398 then 2900 has a lot of room for improvement. I did find a way to use opa627 for IV conversion but it is very pricy and I have no idea whether the extra benefit is sufficiently significant to worth the cost.
I am very much encouraged by the performance of 2134. But I cannot find any infomation about the PCM1790. If it is comparable to 4398 then 2900 has a lot of room for improvement. I did find a way to use opa627 for IV conversion but it is very pricy and I have no idea whether the extra benefit is sufficiently significant to worth the cost.
The modding of my 2900 is officially complete. 
Tonight, I finished my PS upgrades by removing the .1uf/250V and .22uf/250V x-rated safety caps and replacing them both with .47uf/600V Auricaps (ala "auricap tweak").
On the audio board, I replaced the AD8620 I had placed in IC216 with an AD8066 to match the AD8066's in the output path.
I also replaced the stock output path resistors R312, 313, 314, 315, 318, and 319 with Riken Ohms.
In addition to my "Dutch Mod," these last few items have dramatically improved the sound. More detail, tighter bass, more air around notes, and the blackness is just beautiful. Surprisingly, the redbook playback (the 2900 weakness IMHO) has really improved.
Tonight, I finished my PS upgrades by removing the .1uf/250V and .22uf/250V x-rated safety caps and replacing them both with .47uf/600V Auricaps (ala "auricap tweak").
On the audio board, I replaced the AD8620 I had placed in IC216 with an AD8066 to match the AD8066's in the output path.
I also replaced the stock output path resistors R312, 313, 314, 315, 318, and 319 with Riken Ohms.
In addition to my "Dutch Mod," these last few items have dramatically improved the sound. More detail, tighter bass, more air around notes, and the blackness is just beautiful. Surprisingly, the redbook playback (the 2900 weakness IMHO) has really improved.
mrdon said:The modding of my 2900 is officially complete.
Tonight, I finished my PS upgrades by removing the .1uf/250V and .22uf/250V x-rated safety caps and replacing them both with .47uf/600V Auricaps (ala "auricap tweak").
On the audio board, I replaced the AD8620 I had placed in IC216 with an AD8066 to match the AD8066's in the output path.
I also replaced the stock output path resistors R312, 313, 314, 315, 318, and 319 with Riken Ohms.
In addition to my "Dutch Mod," these last few items have dramatically improved the sound. More detail, tighter bass, more air around notes, and the blackness is just beautiful. Surprisingly, the redbook playback (the 2900 weakness IMHO) has really improved.
How does ad8066 compare with opa134 or 627?
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