Anyone famaliar with the manufacturer,and in particular this pre amp.The credentials and testimonials seem impressive.The advertised 10 day audition is appealing.
jojo - Welcome and thanks for your input. Your description helps put the differences between 2.0 and 2.1 in perspective. sltrains - I could tell the differences between balanced and RCA right away (with no breakin on the XLR cables), even my brother who was listening casually heard it clearly with balanced being better Victor - thanks for the thorough explanation. It is very clear and captures the effort and care you and Joseph are putting into things. I agree that it is a great use of new creative energy to now focus on an amp. I can not imagine exactly how the 2.1 can be significantly better given how wondereful the 2.0 sounds but with the folks here mostly suggesting that it is, as well as Victor and Joseph's excellent ears I know that an audition is in my future to hear for myself. Question for Victor. How close do you think that the current modifications can now take the modded 2.0nB toward the 2.1nB? Has anyone done this A-B comparision between those two units broken in?
Greetings to all. I rarely post, but I've been following the action closely.
I just wanted to say that I'm very appreciative of Sherod and others for their time and efforts on testing thing so we can benefit from their experiences. It's very easy to sit back and just watch. I just wanted to say, "Thanks."
I have the 2.0 and 8.0 phono stage, the phono which has the new "mystery caps." I've found those caps to be very good and very quiet so I've been tempted to trade in the Hovlands on the 2.0. The latest thread has me going back and forth. I'm still ready to pull the trigger but the extra 75 bucks made me gulp (am I a cheap skate or what?).
One question for Sherod: how about a V-Cap bypass on the new 2.1 cap. That's one combo that hasn't been tried, right?
Thanks, guys, for the well wishes. I feel like I'm getting get well wishes after my near-death situation. Now that I have the old Hovlands back in, the phasey sound is gone and the sound my ears are familiar with is back, to a certain extent. Having the preamp now on for about 24 hours, the sound seems a bit dark for me, but that could be other issues. I'm going to just listen to music this weekend and try to relax and release some of the stress that has built up for me these last couple of weeks. I'm sorry to have stirred up a hornet's nest for everyone, but I'm a perfectionist and I want my hobby of musical listening to be the best possible.
Sherod, hope you are stil enjoying your new preamp. I admire risk takers and hope that your decision to make further changes did not void the warranty.
As for me, I will wait it out a little longer since the sound I am experiencing is musical and dynamic enough in my Condo, at least for now. I am playing at 11 o'clock and on rare occasions for guests its 12 to 1 o'clock. Lots of headroom to spare.
gentlemen thought i might put my 2 cents worth on this thread regarding the upgrade. i have the upgraded 2.1nB which has about 130 hours so far in my opinion the unit blossomed after 120 hours. in comparing the old 2.0nB vs. 2.1nB i much prefer the latter. to my ears the 2.1nB sounds much nicer, more complete. i've compared it to my previous preamp krell krc3 hands down it sounded 3-4 times better. the krell sounded flat, no emotion, just plain. to my recollection when i compared my old 2.0nB to the krell krc3 the ah was only 1-1/2 to 2 times better. bottom line is i've noticed a big improvement with the upgraded unit and with due time i believe it will sound even better. jojo
I don't prefer XLR over RCA in general. It always depends on how the unit at hand is made. Many times I can't tell the difference on many pieces of gear. In this case Joseph made the XLR (b) version better sounding to my ears. He designd it this way and that is why the B version costs more.
Stlrains, be sure to give the wire at least 70 hours of burn in before coming to a conclusion. I think you will like his XLR wire with your preamp.
Funny that Victor said one may have to move the speakers with the upgraded unit. I did and found a nice sweet spot different from the previous speaker location.
I moved the speakers 7 inches further apart and for the first time toed them in about 5 degrees. They were previousely pointed straight ahead.
I have found Victor's comments to be spot - on. The upgraded unit offers a whole new realm of music. I hear so much more in the music. Much more life and energy. Turn it up and complex passages with dramatic volume swings just soar out of my Dali speakers.
I look forward to the amp they build and will be one of the first ones in line.
My next audio expenditure will be to upgrade my DAC however.
I indicated that I would provide you after the RMAF with a full break out of all the upgrades we now make to the 2.0 to bring it to the level of the 2.1.
Subsequent to my first post about the upgrade we made further improvements to the 2.1. These were in response to a slight high frequency edge we noticed in crescendoes, whether those of a female vocalist or of a symphony orchestra. After listening carefully, we concluded that this edge was really high output breakup. To solve this problem, we went back to the drawing board to figure out how to beef up the power supply so we could increase the output voltage and thus better handle sudden peak surges.
As a result, we increased the number of power capacitors and changed the number of rectifier diodes to permit us to increase the output voltage from 100 volts to 140 volts. To our ears this change alone resulted in softer highs, especially on loud crescendoes, and much more pronounced dramatic contrasts, as if the dynamic headroom had sudenly increased dramatically. In works like Scherazade, where sudden dynamic contrasts abound, we found the sense of raw power unleashed by the crescendo had vastly more energy than before, so that what formerly seemed fine and responsive, now in retrospect seemed compressed. We found this voltage change abounded in other pluses and resulted in no minuses.
Some of you, Sherod, for example, noticed an increase in gain, while Grannyring did not. Whether you do or don't experience increased gain will be a function of the tubes you are using and whether they translate the increased voltage into gain--Sherod's do and Grannyring's don't.
The other changes have already been described. The most important being that we upgraded the old multipath wiring harness from the RCA jacks to the volume pot and to the main preamplifier PC board and replaced it with a new upgraded Transparency wiring harness, which like the Transparency now comes wrapped in an extra isolating layer of Teflon for better noise suppression. The layout was also changed. Because of the better noise suppression of the harness, we were able to dispense with the line filter. For your interest the line filter was never a part of the “n” upgrade: it was always part of the original design and exists in the TP 2.0 as well. It will be returned to you for use elsewhere in your system if you wish. Because the internal harness is essentially an internal Transparency harness, like that cable, it needs almost 100 hours to burn in. The improvements that come from upgrading cabling are those that we experienced with this upgrade--better microdetail retrieval, improved harmonic texture, etc.
The next big change was to replace the Hovland caps, which also will be returned to you, with the larger, more expensive shielded capacitors we now use in the TP 2.1n version. In addition, we take a small 0.22 uf Solen cap and parallel it with the large cap. In our experience, this softened the highs and removed a slight high end burr without rolling off the top. The improved caps to our ears dramatically improved the soundstage, both side to side and front to rear and improved the imaging. We also found them to provide a less veiled sonic signature. The Hovlands are very smooth, but in comparison they are quite compressed and appear to mask the harmonic texture of the instruments. While there was a slight loss of smoothness with the new caps, we found the gains substantially outweighed the losses, and we abandoned the Hovlands without regret.
Some listeners, Sherod, for example, and another of our 2.1 customers, are hearing things as a result of the capacitor change, that frankly we are not, which is disconcerting, since we are finding it difficult to be of help because we can not reproduce what they are hearing. Joseph has actually gone so far as to replace the caps again with Hovlands in order to conduct an A-B to see if he can reproduce what the others describe, but without success. He wonder whether the increased soundstage of the new caps requires a slightly different speaker placement because of the wider and deeper soundstage. Frankly, this is just a guess, since we really can not reproduce what is being heard, and other owners and revieweres of the 2.1 do not report it.
The other changes in parts, e.g., by virtue of adding capacitors, contributed less to the sonic improvement.
If any of you are having problems with ground loop issues or tube microphonics, Joseph will look into them at this time.
Finally Joseph will inspect the preamplifier to be certain it is operating properly.
Some owners have tended to over-value the significance of the cap change. They are not the whole story, though in terms of cost, they are the biggest cost item--$85 with the Solens at our cost. Some have asked if they can install them. Sometimes, one sees very wide traces on the PCB. For example, we saw them at the RMAF. But wide traces increase inductance and thus impair the sound so Joseph's traces are very fine. Sonically this is a benefit but it means they are easily damaged, so we do not encourage replacing parts. Doing so without our authorization will void the warranty.
Finally, Joseph is finding that the entire upgrade takes him about 5 hours, longer than he had expected, so we are compelled to increase thee price of the 2.0 to 2.1 upgradeto $375, and the cost of the 3.0 to 3.1 from $400 to $475.
On an entirely different note, Joseph feels he has gone as far as he can with the 2 series preamp design. He wants to put his energies to designing an amp and to designing a dual mono design preamp with upgraded hardward and parts, just to see what he can do when he is not preoccupied with meeting a price point.
The amp is a source of concern since there are so many ways to go.
Soon I will place a post asking for some direction from you. I will also in the next couple of weeks post a report on the show.
Sherod I'm very glad you have the sound back that is to your liking. Its a fine line especially when you have already achieved and had that special sound, then its gone way to go you explorer you. Last night was lp cleaning night for me and now that i have switched to walkers prelude system, the time factor is doubled. From what i can hear its worth the extra time though. Bad part a lost night of music. I'm going to poll you guys as i have a decision to make. I asked for a 2.1 nrp to audition and was sent a 2.1 nbrp. I have not used the balanced connections. Victor is sending me a xlr ic for me to try balanced out. I know Grannying prefers balanced. How do the rest of you feel about balanced connections. I dont have any source gear that is balanced. My amps do take both rca and balanced ic. Its a 800 dollar upgrade. And for me as with most every dollar is valuable.
Grant, I agree that Blackgate caps take an unusually lengthy time to break in. Some have said the larger values take up to 600 hours or more. Most of your polyprops, metal films, oil impregnated, etc. take much less time. Speaking of Blackgates, I have read that the manufacturer has stopped making them. I know that Joseph uses them in some of his tuner mods. He put some in my tuner mod.
Bill, I think 140 hours on my upgrade was enough break-in for me to know if the caps were right for my system. Regarding the tube locations. Looking down from the front, starting from left to right is location 1-4. 1 and 3 are the most critical to the sound. I might be up to the wee hours myself listening this weekend. The fun is back. Enjoy.
Sherod, Wow your a man of action! Seems you got down to the bottom line on the upgrade and burn -in. Not so much the wire harness or power supply, rather its the output caps and bypasses that are troubling you.
That is great to know Sherod, but one important question still remains for this audionut. Would the caps you've removed ever have settled in and actually sounded better than the ones you put back in? Vic and Joe sure think they did?
Just reading this thread we know other caps took upwards of 350 hours and changed quite a lot over that time.
I am curious what your thoughts are on this.
One other question, I hope someone can help me with this. Tube positions 1 and 3 are where? Looking at the front of the unit and starting from the right hand side?
Stayed up to 3:00 AM listening. Music always sounds better after midnight and what's with that folks!
Slttrains - congrats on a good decision in a complex obsession prone enviroment:) I am very happy for your excellent synergy among your pieces of equipment. It is so healing to be able to sit back and let the music transport you to wonderland. Bill, I also have the house to myself tonight and tommorrow. Wife is taking second daughter on a tour of possible colleges. Listening to Bach tonight and marveling the night away.
I guess I have a different preamp than anyone now. It is no longer a TP 2.0n version nor is it a new TP 2.1n. I have affectionately renamed my preamp the in-between model, the new TP 2.05n. Must... go... listen. Music is beckoning.
Well Gentlemen. I have decided to go on my own with a slight modification. My instinct to hunt( as Stltrains says about man) and my desire to know the truth forced me to do a little experiment. Tonight, I very carefully took out the new output caps and bypasses. I replaced them with the original upgraded Hovland 4.7uf caps from before the upgrade. The system has been playing now for about an hour. So how does it sound, you ask? The "breath of life" is back. The midrange now has that palpable realness that I've been missing. The soundstage now has normal front to back depth. Highs are once again clean and extended and the bass is as powerful as it was. The power supply mods that Joseph did seems to make an improvement. I get a slight increase in volume, but the dynamic differences are still realistic in portraying music. I'm sure that the new wire harnesses are also contributing to a cleaner sound as well. I'm not sure why this small change makes so much of a difference in my system but I'll guess and say that it was a combination of an impedance matching issue with my amps along with some phase irregularities that I mentioned in my previous post caused by the bypass caps. All I know is that I'm a happier guy tonight and my ears are pleased with the musical portrayal.
The wife and kids are gone tonight all day Friday. I have the day off also!! I am listening to music late into the night and loving it. No doubt the 2.1 is coming into its own in my play room. It has been on with loud music all day and night thus far. Best sound I have had in my room.
My Belles Reference 350 specs are as follows. This is for Tvad to help me understand how these numbers mate with the AH preamp.
"Input sensitivity 1.98 for rated power" "Input impedance 50,000 ohms"
Tvad, I think speaker wire also impacts impedance?
Sherod, I am staying tuned as I feel kinda bad as I think you decided on the upgrade based on my comments. I sure hope in works out to your complete liking.
As the calming of the seas are upon us, lets take a deep breath and wait for Uncle Joseph to respond to all our speculative discussion.
Sherod, I do not believe your preamp is broken in yet. I would try and use voice recordings to see how the midrange changes over time. Like fine wine it has to "mold" before you can enjoy it. Trust Joseph and his upgrade just a little more.
Grant, I'm not so sure yet that the issue is with the amp interaction. It might be just a coincidence that we both share sister amps. I am going to take an educated guess that based on my experience(with changing out the output caps, experimenting with different brands and values, as well as with many smaller bypass caps)that there might be a phase anamoly or irregularity with the new output caps and the solen bypass caps. In the TP 2.0 version with upgraded Hovland caps, rated at 4.7uf, I tried different values of the same Hovland cap( 1uf,2uf,3.3uf, and 4uf) None sounded as good as the 4.7uf value which Joseph was using. This lead me to believe that Joseph knew what he was doing and had pretty good ears. I later tried various Audiophile-type caps( Dynamicaps,V-caps) with same and different values and always came back to the 4.7uf value. For some reason, this value worked best with my VAC amps and sounded the best to me. Initially, I preferred the V-caps( 4.7uf oil-impregnated) because they just had more life and dynamics to them. But after a while there was this over-warmth and smoothing effect which robbed the music of proper attack to my ears, so I eventually went back to my trusty Hovland caps. It was when I recently found a new power cord line, Fusion Audio) that these really brought out the life and realism of my system, especially the TP 2.0. Everything finally just "clicked" in. Based on my faith of Joseph's ears and work, I decided to try the new upgraded version and that is where I am now after about 130 hours of burn in. One of the things that I noticed when I was experimenting with different caps and bypasses, the preamp never, and I mean never, sounded right with the bypass caps, no matter what value. Every bypass cap caused some type of phase anamoly which skewed the frequency response in an unnatural way. Depending on the value of the bypass, this skewing ,or plateau-effect, if you will, took away that natural balance and breath of life from the music. My TP 2.0 sounded its best when only one value cap alone was used in the outputs. Ultimately, as imperfect as the Hovland 4.7uf is, it sounded the best in the circuit of the TP 2.0. Joseph got it right the first time around, IMHO.
Another vote for keeping the discussion on the thread as I too am interested, knowing that nothing is gospel and that you have to heard for yourself with your room, equipment and set of ears. I mostly use a grand piano in the same room as my reference as I go about changes to my system. Have to say that the original decked out AH 2.0(cca's,BN design) seems pretty darn close to ideal to me with my equipment. But I have not heard a broken in 2.1 yet.
Grant, I feel a bit uncomfortable mainly because I seem to be the only one so far who has issues with the new, upgraded preamp( besides yourself, that is). I just want to make sure that all is okay before I make any final assessments. I'm currently communicating with Victor who is awaiting a response from Joseph on what I can do to determine why I am hearing what I'm hearing.
Well all i dont have a audition 2.1 any longer. I'm not letting this fine preamp go anywhere I'm buying it. It was not a easy decision as my nuforce p-9 is also a very good performer. Very quite, fast, but in the end i have warmed up to the sweet tubed sound of Josephs very fine 2.1 preamp. This preamp seems to match up exceptionally well with my ref 9 se v2s and linbrook signature system. Along with my jps sc2 ics and speaker cables i am getting sound that i hope to live with for a long while. Going to leave the explorer in me locked up and enjoy the beautiful sounds of music i am hearing now from my system. My analog front end is certainly providing the source for a clean, sweet, delivery of musical sounds. I would like to give Joseph and Victor a big thank you for designing, manufacturing, and running a audio company that puts out super fine gear and offers a high level of customer satisfaction.
I will look up the specs for my SS amp tonight. I am also getting a nice triode tube amp Friday and will play with that!
I also think the output or gain of the AH is an issue to look into. The version one owns and the use of XLR or RCA connections perhaps changes the output or gain. Not sure if impedence changes.
Here are the specs from the AH site.
TP 2.1 TECHNICAL SPECIFICATIONS Frequency Response: 10 Hz to 50kHz +1/-2 dB Total Harmonic Distortion (THD): 0.05% @ 1 kHz, -20 dBv, A-weighted Dynamic Range: Better than 90 dB Signal to Noise Ratio: Better than 105 dB Channel Separation: 90 dB @ 1 kHz 70 dB @ 10 kHz Gain 20 dB or 10dB with B upgrade Output Impedance: Less than 600 ohms AC Voltage: 120 Volts AC Frequency: 50/60 Hz.
I have the upgraded B(balanced?) and N version and use the XLR connectors. The gain is 1/2 or only 10 db instead of 20 db for RCA. I am not a tech guy and perhaps this means nothing but having to turn the knob higher to achieve the same volume.
My B version XLR connections sound better in my system vs the RCA. It is easy for me to compare both as I own both AH RCA and XLR cables.
My AH DAC has two settings for output a low and high gain. I use the lower setting. Not sure if this has any impact?
I do not find my upgraded version softer or recessed. My experience is just the opposite. Voices are more forward and symbals have more impact and decay. The 2.0 is softer sounding in my system to be sure.
The sound is not as round and warm as the original version yet. Like a little more BODY to the voices and hope burn in will do that.
Very interesting set of experiences between all of us thus far.
Grant, My upgraded preamp just passed the 120 hour mark. Yes, the voices do seem to appear to be still slightly recessed. The highs are also a bit softer,i.e. cymbals and bells are a tad soft. I used the word subdued with Victor and he calls it soft(You call it "to-ma-to", I call it "to-mah-to"). The soundstage seems to be wider, yet not deeper( overall much larger than life to me). I am going to give it through the weekend and by then, if I'm not satisfied, I'm going to talk with Victor or Joseph to see if I can semi-revert back to the original TP 2.0n version. I have tried many different versions and value sizes of output caps in my previous TP 2.0n version and Joseph said that when he upgraded my preamp he had to repair some traces on the board that had rubbed off somewhat( from all the cap changes I made). Victor "strongly" urged me not to experiment with cap replacements anymore. Still, at this juncture, my ears are missing the "breath of life" sound that the Hovlands were giving me, in spite of Victor's opinion that the Hovlands sound a little compressed and veiled in comparison to the new caps. Since Joseph doesn't give an itemization of all what changes he makes( only a generalization), I'm wondering if my older Hovlands would still be a drop-in replacement for the new output caps. Victor told me that the Hovlands would work in the new unit, but hasn't responded to a follow-up e-mail where I asked him to confirm with Joseph about the Hovlands being a drop-in replacement) You might want to consider communicating with me privately from here on so as not to ruffle some feathers here on this thread.
I use balanced in and outs on my 2.1 upgraded preamp. I understand in my version Joseph puts some more money into the XLR jacks. I think he builds in some sort of balanced transformer in each channel. I have to check on that. I also noticed a nice improvement using the XLR's as I also own AH RCA IC's.
That wire harness is long from the front of the unit to the back. The new chasis 2.1 has a much shorter cable as the volume knob is connected to a rod which reaches far back into the unit.
For the technically-minded, the new output caps in the TP 2.1 upgrade are 1uf value. These are bypassed with a .22uf Solen cap to tame down the highs a bit. The TP 2.0n had a 4.7uf Hovland. I find this interesting as this value difference might make a difference in matching to input impedances of certain amps. Perhaps Victor will expound on this.
I put a ec 88 in slot 2 to have balance. Contacted my tube man and as you guys know the cost of ccas is well, a sellers market. I hope to hear from him tomorrow. I have made so many changes that i think i need a good nights listening to get my bearings. Gammajo but as far as i can tell with a short time with out the rings i believe more air and a delicate sound. I had a hard time finding a difference with half cca and ec 88 to. Like Sherod said if we could just leave well enough alone. but nooo we have to experiment and try different things.
Stltrains, Gammajo and Sherod. Just wanted to add these observances that I experienced with my AH 2.0n. I added extra copper shielding between the power board and the tube board thinking it will make improvements. All it did was to remove the "air" or "breath of life" from the instruments making the sound more sterile and flat. The Loss of immediacy and refinement was too much to bear so I removed it and my sanity returned.
This preamp is already properly dialed in and I believe that if Joseph wanted to produce an all out state of the Art pre, this would be it with other refinements like a true seperate and robust power supply. He has everything else right in my opinion.
By the way I have both circuit boards isolated and floating and recommend it highly. The cca's are another must upgrade that all AH owners should do.
As to the break in period, I wonder if the new wiring is the culprit here?
Stltrains, I'm glad to hear that you isolated the bad tube. You might like this new configuration better. It's very similar to my configuration. I also hope that the seller will work with you on the exchange. Keep us posted on the sound with these new tubes.
Mark - Thanks for your detailed, cogent and honest Ref 3 comparision. While 4X AH price is out of my current league, it is nice to hear anbout a really great product.
StlTRains - The other responders are right that NOS can be microphonic, but I had alot more trouble with microphonics with Siemens E188cc's than with my cca's. I own two seperate quads of these. IMO they should not ring even without the use of dampers becuase all dampers that I have tried also dampen the sound.
By floating the board I meant that Joseph for me (to solve microphonics) did not screw down the board that the tubes are plugged into but rather let it float free. The problem herein is that it needs to be tied down for shipping which IMO is not a big problem.
I use balanced outputs to my amp but unbalanced inputs from my DAC, so I have 1/2B type unit. I did notice quite a positive difference using the balanced outputs versus RCA - quieter, more three dimensional, more air. But much of this could also be due to different IC's. I used AH IC's for the balanced and Guerilla Audio silver for the RCA.
Hello guys and let me say thats what i love about this great hobby the support and responses from fellow audiophiles when in need. This is what i did. I swapped front to back and removed the damper. Same ping but right channel instead of left. I inserted one of the ec 88s into slot 4 and tried no ping. Slots 1 and 3 are the ones i want the CCAs in so i still have most of the benefit of the CCAs. Going to contact my seller and see what he has to say. Thanks again all.
"Over time I have to agree with Sherod, the newer version is weaker in "breath of life". Combined, all these differences make for a very different sounding preamp.
Perhaps burn in will ultimately bring this attribute to the music."
Bill, I heard this "breath of life" phrase in an older review from back in about 1978 of a pair of speakers that were time and phase aligned. Ever since then, I've kept this phrase in my mind as to me it encompasses a lot of things. Actually, that elusive "breath of life" is more important to me than any of the other attributes you mentioned, yet when a component expresses that "breath of life" the other attributes should be there as well, but not always. In a nutshell, "breath of life" means real and palpable to me. If I'm listening to a good piano recording, I expect it to give me a "live" presentation, not a reasonable facsimile of one, no matter how clean and big it sounds on that stage. So far, with my upgraded preamp, the presentation of the soundstage is larger than life, and the sound is all coming from a two-dimensional plane. For example, when I listen to an orchestra that has been well recorded, I want to hear the trumpets coming from the back row, the flutes and clarinets on the front, the percussionists even further back. To me, at this point, the orchestra seems to be all sitting together on the front row. This is difficult to explain, for me.
Andrewdoan, I'm sorry that no one has answered your request, so I'm assuming that nobody has had the chance to compare the Rogue with the TP 2.1n. As you know, Audio Horizons offers a trial and money-back guarantee. From a few previous posts there is some confusion as to the adequate time allowed in this trial to fully evaluate the preamp, however, most of the current owners seem to have kept their preamps while making up their minds before the 10 days ended. If you have or can get a Rogue unit for evaluation, I would suggest that you time it to get both the TP 2.1n preamp in at the same time of the Rogue unit and do a fun comparison of both in your system to make up your mind of which you like better. Maybe, someone will still chime in yet to give you their personal opinion of each.
Stltrains, Regarding the pinging sound on one of your channels, I'm guessing that one of your new Cca tubes is microphonic. The 6922( E88cc) family, particularly NOS vintage ones were notorious for being microphonic. You might consider contacting the person you bought it from to see if he will exchange the bad one for you, unless they are a perfectly matched pair. Then you'll need to exchange with him the matched pair. Before you do that, however, exchange the tubes from left to right to see if the "pinging" sound moves to the other channel. If it does, then you definitely have a bad tube. If the pinging remains in the same channel after reversing the tubes, then you have another issue to problem solve for. I'm glad to hear that you are enjoying your preamp with the new Cca tubes. If the tubes are really NOS, then they should get even better after about 100 hours. Have fun.
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