Cuppa
<100
Sent me a GRADO got me banned
Boner fide member of the Canadian Goat deprecation society
Posts: 33
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Post by Cuppa on Dec 19, 2006 22:27:14 GMT
In case you don't know, it was my borked Grado RA-1 which sparked off the rumble in the jungle over at goat-fi and Mike's brush with the long rubber gloved arm of the law over there, so I did some digging around and found this, which kinda backs up what he was saying... www.ecp.cc/ra1.htmlKinda interesting to see what has been done with it here...
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rickcr42
Fully Modded
Rest in peace my good friend.
Posts: 4,514
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Post by rickcr42 on Dec 19, 2006 23:02:26 GMT
Well,probably take an ass whipping for this but I would take an RA-1 over a Pimeta for driving the RS-1 every time without hesitation.I will ALWAYS take a single stage and simple design over multistage and complex design when offered a choice if they both accomplish the same thing which in this case they do not the Grado Amp being a more optimal match for the Grado Headphones-at least in my experience with both types and as a die hard Grado headphone user Also-I am about the least fan of the three channel amps still breathing feeling while there may be some valid reasons for the topology when the source of power is a battery there is more problems introdeuced than there is corrected with a mains line based supply,something that seems to be popular with many even though you read all the forum cries for help when something goes wonky. as a general observation on the state of recent DIY Forum "group build"/Semi-Pro Product Dealer audio (every design seems to go to a product these days no matter what the merits or need) I do wonder why so many try to overcomplicate very simple circuits then set out to find complicated solutions to fix problems they themselves introduced when slimmed down electronics on a diet more often than not perform just as well,many times better opinion,just opinion,mine
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Post by PinkFloyd on Dec 19, 2006 23:44:56 GMT
In case you don't know, it was my borked Grado RA-1 which sparked off the rumble in the jungle over at goat-fi and Mike's brush with the long rubber gloved arm of the law over there, so I did some digging around and found this, which kinda backs up what he was saying... www.ecp.cc/ra1.htmlKinda interesting to see what has been done with it here... I'm sorry to have shit on anyones party but was fckin flabbergasted when I saw that amp in real life, ESPECIALLY (and I'll repeat this) as it costs the equivalent of almost 900 dollars ($900) in the UK. I don't care what anybody has to say in its defence, it's an absolute disgrace charging that kind of money for a CMOY in a block of wood, GRADO or not. No wonder your switch broke Cuppa... cheapest of the cheap. I'm not one of these component snobs but fck me if I pay $900 for an amp I at least expect to see a bit of quality for my money. The chassis mounted phono sockets they use are absolute RUBBISH, I speak here from experience.... overtighten those guys more than finger tight and the threads shear or the damned things actually snap in two! Hold the soldering iron on them for more than a couple of seconds and, again, the shitty plastic insulation actually melts. www.rapidonline.com part number: 77-0039 these things are absolute "CRAP" and I'm sure, on this one, Rick will agree ;D I've got a bucket full of them and wouldn't dare fit them onto anything in fear they snap off after a few makes and breaks. Acceptable (just) on a cheap and cheerful piece of equipment but on a so called "reference" product an absolute joke. Then to find a Cmoy potted in resin inside and some hair thin hook up wire with poorly soldered (insulation melted) connections...... "reference"? fckin stitch up in "my" opinion if that's what they class a "reference" product then it doesn't say much for the rest of their line up in my books. Everyone waffles on about how great their headphones are, and how you need to find that "extra special" amp to get the most out of them. I'm sorry, I don't buy that crap either. Just read around the forums and time and time again you'll get the question "yeh, but can the amp drive Grado 'phones" The answer is probably yes but they'll still sound like the dogs they are. I've had a few pairs of Grado 'phones come my way over the past couple of years.... currently SR-225, last ones were SR325i and ones before that SR-125 and SR-60 and you know something? I couldn't get any of them to sound anywhere near as good as the hype that surrounds them and I was / am fortunate to have a wide selection of amps at my disposal (usually 10 different amps at any one time) so all this crud about finding the "right" amp to drive them doesn't wash with me, I've finally reached the conclusion that their headphones are as prosaic as their reference amp. Same old hot melt glue holding the headphones together and same old lump of "mahogany" on their reference headphones. Sorry but I'm not deaf and will not hold back my opinions. If I'd only ever tried the Grado 'phones with one amp I might have bought into this "you got to find the right amp" hype but considering I've tried them with tons of amps and still find them to sound shrill, 2 dimensional and enclosed.... in My opinion, (got to keep highlighting the "my opinion" bit) and, as far as I'm concerned, they are far from the World's best and possibly they're the worst.... Of course if you believe the hype that they're the best thing since sliced bread but it's your amp that isn't good enough for them and want to go down that never ending route..... so be it. I'll stick with headphones that sound good / are compatible out of 95% of amps that are out there Sorry Cuppa, went a bit off topic there.... yeh, the dissection you link to shows the guts in graphic detail but I really don't need others approval or back up when it comes to forming my own opinion. EDIT: the usual response to my dissatisfaction with the GRADO 'phones I've tried is "you really want to try the RA-1" erm.... no thanks, once bitten........... Pinkie
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rickcr42
Fully Modded
Rest in peace my good friend.
Posts: 4,514
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Post by rickcr42 on Dec 20, 2006 0:36:16 GMT
that would 100% take it out of contention for me but being that here in the states the cost is in the $400 range last I knew competitive with other solid state amps. and especially the ones that add complications or "flash" just to make the product SEEM to be better when anyone that knows dick about grados knows you drive them with the simplest circuit you can they needing at WORST +6dB gain. some folks need to see a shitload of hardware and fancy parts while others are happy knowing something was ENGINEERED even if that engineering goes to simple and why a damn lot of great products are passed by or if not idiots open them up in an effort to "improve" with the usual result of the exact opposite.I also like that statement in the above link "took out the input caps being unneccessary" could be in THAT PARTICULAR SYSTEM but sell an amp that has direct input coupling and no DC Servo and you will go broke replacing all the cans that got toasted from a high DC rider on the output of the amp because of previous stage shortcoming.This is why you damn near never see DC coupling in a true commercial design but may in a DIYFP amp (try getting a kitchen table operator to make good on ruined headphones !) My favorite "in house" Grado driver is a simple unity gain single ended class-A mosfet "Szekeres" amp that costs in parts alone close to what the RA-1 retails for even though "simple" with my second choice a nice little beam power amp that spits out around 2 watts per channel for headphones/nearfield speaker listening then a straight LT1010 buffer I have hanging off one of the outputs of my passive control console and finally for on the go duties a simple "RA-1 Like" dual nines powered AD8397 (though could just as easily use the same chip and I would not be unhappy).I am not much of an op amp guy but if cost were a factor would be since any of the above solutions cost way more than a finished RA-1 with the exception of the straight buffer and straight op amp unless i also add my time into the equation then no. and every other amp no more than a cmoy with a buffer hanging off it in a hammond case,a case costing far less than a solid mahogany block that must be actually worked to get the size right.i guess if someone was retarded enough to spend $40 for a pair of OPA627s then another $12 for a pair of buffers it would make folks feel good about themselves but that is no guranteee of better SQ with the RS-1 cans,what the amp was designed to drive to be honest I find ALL portable amps totally unacceptable for that very reason-shit parts and especially so the pots.My MINIMUM requirement is the mini alps that Grado uses but even that is not my style and why all my so called "portable" builds are not teeny tiny toys but AMPS with full size switches and full size (2 Watt) volume controls and not those rinky dink toy parts that are passed off as quality goods.Hell,even my rotary switches way a freakin TON (sealed silver with large contact area) and have no shot at fitting into anything resembling "portable" but at $25 per would price my amp way out of contention anyway if used as would the other parts i like to use.Who in their right mind would pay the $1K I would have to charge for a puny portable just so i could turn a profit ? No One is who and why it will never happen that is unacceptable but to be honest the jacks I use cost me $4 per jack and THEY melt if i don't watch it.They don't break though and I know because if anything i crank my jacks down to the stress point where the frikkin' chassis starts to cry out ! nothing worse than having an RCA jack (piss poor fkn jack as it is anyway) start to spin on the panel from inserting-unplugging cables read the other thread Mike.I posted a link to some NASA "artifacts" where a "potted" assembly is shown and explains the reason for it (and yes,can provide more lnks) which is VIBRATION CONTROL that along with the nice decay of solid mahogany + the dissimiliar materials (no two like solids in contact with another ) is DEAD ON with vibration control theory. The "hair thin" hookup wire ? I use #30 solid copper magnet wire for ALL signal path connections and have zero desire to use anything larger and this purely on the SQ merits.Real bitch to work with but for me worth every second of swearing at it. Because ALL the Euro cans have a rolled top end and so the amps are made to match THAT sonic profile ! My Grados will kick the living shit out of any cans extant on sheer energy alone and since i have the proper "driver" will go noe to nose tonally as well with anything out there. Just as with my horn based loudspeakers if I had the lunacy to hook up an amp that was designed with a "dome tweeter" loudspeaker in mind (another "known" high end softener) I would likely run from the room holding my hands over my ears but since i am not a total idiot I match the amp to the speaker and get great "tone" along with the knock you dead dynamics horn drivers are known for,something i personally must have and which the Grados unlike any other headphones known to man provide. i have electrostats too BTW but they like stat speakers are best for small format acoustic music but have no where near enough pure power to do power rock at anything above a loud whisper-again the proper tool for the job thing far from deaf myself bro so do not imply your TASTE is an absolute and that anyone not in agreement is retarded ! If there was a single way for everyone then there would only be ONE brand of headphones and a SINGLE AMP to drive them but notice that is not the case and that alone should tell you something. That you hate Grado is fine,your choice dude.Just don't think your statements are "absolutes": that hold any weight with those who do not agree...cause they don't and Bose rules cause you can replace a HUGE system with a dinky little table top with dinky little speakers that puts out a dinky little "syrupy" sound.That 95% of the amps are voiced to overcome sonic limitations in one type of headphones and is the exact opposite profile needed to drive the only headphones by a manufacturer BOLD ENOUGH to go away from the lemming like "me too me too" of sameness does not make the ONE wrong,just different......
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darynalexander
100+
will probably give you some sort of disease.
Posts: 179
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Post by darynalexander on Dec 20, 2006 6:11:09 GMT
My jaw dropped when first looking at those pictures, therefore I am pretty much speechless. Its just kind of sad.
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rickcr42
Fully Modded
Rest in peace my good friend.
Posts: 4,514
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Post by rickcr42 on Dec 23, 2006 3:22:08 GMT
The "RA-1" of T-amps firenzeaudio.50webs.com/tech_vibration.htmexplains the whole potted module/wood case thing better than I ever could that even if you have doubts as to the validity of (and I don't having noticed a change in tone all the way back to the first Japanese recievers that first went "woody free" and the reason for me always adding some to modern electronics to change the vibration decay tone) is at least a lucid argument worth reading.Not everything is exactly what it seems nor is it always the loudest voice that is always right (charging for a wood case just to make a crap amp look good ) Rickwood,kinda like Hollywood but alot less glitzy being big time rough around the edges yet with a mellow tone that goes to comforting on a good day......................... **
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Post by PinkFloyd on Dec 23, 2006 10:27:33 GMT
Much the same idea a few years ago Rick where I totally encased a glorified Cmoy in hot glue, called it the "Alien" as the innards looked like some kind of glittery silver Alien life form. Sure, it sounded good but not exactly ideal if it ever came to servicing
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rickcr42
Fully Modded
Rest in peace my good friend.
Posts: 4,514
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Post by rickcr42 on Dec 23, 2006 15:03:19 GMT
So THAT's where The Blob originated I Funny how something that began so small and innocent looking ended up being such a freakin' nightmare goes from - "so why don't we blow this clam bake and go to my place where we can get nekked and you can check out my amps......." to- then ALL HELL BREAKING LOOSE Real international fkn nightmare is what ! But YOU dude ! You ! You couldn't leave shit alone could you !You just HAD TO play patty cakes with the Warden's Daughter ! which any fool NOT named Pink Mike would have known would lead too and the whole damn fiasco starting all over again.Full disclosure dude,felt it my job to out the culprit ;D **
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Post by dsavitsk on Dec 24, 2006 9:22:08 GMT
Well,probably take an ass whipping for this but I would take an RA-1 over a Pimeta for driving the RS-1 every time without hesitation.I will ALWAYS take a single stage and simple design over multistage and complex design when offered a choice if they both accomplish the same thing which in this case they do not the Grado Amp being a more optimal match for the Grado Headphones-at least in my experience with both types and as a die hard Grado headphone user I don't want to get drawn into one of Rick's rants but since the amp in question is mine, I'll say a few things. I, too, am a Grado lover. I use RS-1's and I don't even think of upgrading my phones. I thoroughly enjoy them. I also agree that simpler is better. Right now, I am using a single tube, LED biased, and transformer coupled to my headphones. The amp can take a ton of tubes -- been using 6N6p's, but have modules built for 5687/7119, 6c45, 5842, 6sn7, and 6dj8/6h30/6N6p/6N1p/etc. The dual ones are run in parallel. I have James transformers in right now, but have some custom wound electra prints in the mail on their way. Even without tweeking, this is simply the best sound I've ever heard. (For those interested, the PS is a RCLCRCRC filter followed by a mosfet follower type regulator.) That said, while I agree that the Pimeta is not that great (and it has long since been removed from the Grado box) I do think it is a step up from the RA-1. The NJR4556 is just not a good sounding opamp to me. I think, for instance, that a single LM6172 sounds way better, controls Grado's just as well, and can be used without the input cap that the RA-1 uses. So, my biggest dissapointment in the RA-1 is that for just a few dollars the RA-1 could at least be passable. The Pimeta with decent opamps can sound pretty good, but mostly because of the BUF634, does not have the same raw energy of the RA-1, but it also doesn't have the harshness. And last, there is nothing simple about an opamp. It inherently violates the simpler is better policy. A Zen, or a Szekeres, is a much better design than a cmoy or RA-1. Oh, and anyone wanting to drive Grados, try rjm's 3 channel Szekeres. It is a clever way to get rid of both the input and output coupling caps, costs about $15 to build, and sounds amazing. I use is with a parafeed preamp in my main system, and it gives the transformer coupled beast a run for its money. Even more last, links to my modified RA-1 (posted by others, not by me necessarilly), when posted at head-fi, have historically been deleted by some moderator. I am still a member in good standing there, and no one has ever said anything to me, but links to it do tend to disappear. -d
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rickcr42
Fully Modded
Rest in peace my good friend.
Posts: 4,514
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Post by rickcr42 on Dec 24, 2006 18:33:14 GMT
There really are only two op amps out there that can pull of the "KISS" Grado amp and that is the RJM part Grado uses in the RA-1,a VERY obscure part totally unknown to DIYers until it was "outted" as the op amp in the amps goop and that someone had to spend a fair amount of time to both FIND then optimise to behave well in a headphone amp,no easy task for many as the second op amp,the AD8397 has proven both being bipolar input devices. So once there is a parts identificaton and a loose set of parameters set up as a guide a protype built then "tweaked" to what is the end product being desinged.This is neither free or quick so in the end means a lot of loot was spent up front before there was an actual product offered for sale. WE just look at the schmatics of other peoples work mostly,copy it,maybe do what we consider make "improvements" then many make the statement of "whats the big deal here ? I built mine for $50 yet they are ripping off customers by charging $400 !" Wrong ! copying is not designng.Discovering what someone else uses is not research.Building on your kitchen table is not paying for factory space or assemblers or shippers or other overhead.It is just a DIYer with a bag of parts,a schematic provided by the one whos product is considered a rip off and a soldering iron. Is it the best driver out there for the RS-1 ? Hardly but there is not much you could BUY ib that price range that will better it fully built and ready to play right out of the box. I personally do not use op amps for any part of my home system and if i could get away with it (battery drain,heat,size) would not for portables either but having said that my portable is a simple "RA-1" type amp using the ADI chip.No bloat,just the music please. The PiMeta and their ilk are bloated designs to my way of thinking ading way too much circuitry for portable use yet comrpimised as a home amp even though suited to doing both duties.I DESPISE the active ground channel and feel it brings more problems to a simple device than need to be there though many feel otherwise so just me I guess. My "home" Grado amps currently ? Mongo Szekeres,an amp that continues to amaze for being so simple though mine can hardly be considered simple if the power supply is considered it being in a bigger box than the amp 6J5 6V6 SE amp James 10W output trafos,gets about 1.5 watts,more depending on feedback/mode setting so works for both speaker driving and headphones Straigh buffer/line driver using a seriously HOT running (way up in class-A ) LT1010 buffer with a jfet front end to show a high impedance to the previous stage while getting the buffer drive impedance down to where they operate best (200 ohms drive). I use these on my passive "preamp" and following my gain stage plus there is one hanging off the monitor output of my mixer along with an SDS Labs amp used to drive other cans That's IT ! My only other "headphone" outputs currently are my ASL UHC Signature that hangs off my SE 300B amp and an AVA type speaker/headphone switch box that i can use with any in house amps and that i use during the design part of my amps to check progress so as you can tell ALL my amps are as simple as i can make them and still have them perform the duties I need. Oh yeah.My 6SN7 preamp is trafos coupled and has a 600 ohm/300 ohm/150 ohm setting for using with med impedance cans just in case but needs the buffer or szekeres on the output to drive Grados
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Post by PinkFloyd on Dec 24, 2006 20:11:43 GMT
That's one seriously well built amp dsavitsk, did you make it yourself? Will it be housed in a wooden or metal enclosure? I think wood would look nice So "you" are the mystery man who depotted the RA-1? Nice one! Some may not like people who poke about under the bonnet (especially Grado ) but I love them! Power to the pokers!
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Post by dsavitsk on Dec 24, 2006 20:49:53 GMT
6J5 6V6 SE amp James 10W output trafos,gets about 1.5 watts,more depending on feedback/mode setting so works for both speaker driving and headphones I've got to say, even that is too much complicatiion for me. I prefer the spud amp configuration, and a properly chosen tube (6c45 or WE437a for instance) put out just as much power and gain without the need for extra coupling caps and bias caps and the like. But, to each his own. Thanks. I am prowd to say it is my design. I sat down with the datasheets and a ruler and figured it out. Of course, there is nothing new under the sun, so there are ideas from lots of places, and I tried a lot of things that didn't work that well before settling on this design, but I think it is safe to call it my own. I have a Welborne chassis out of custom Padauk just waiting to house it. The Padauk matches my 300B amps I am also going to get the top plate done by FPE but need the new transformers to show up before I have the measurements. I actually knew what was in there before digging as I had found another web page with some info. I don't think I have the link anymore, but it was the one people were using to build clones, so I was a bit late to the party. I don't really get the argument about not digging. I work on and with open source software in my day job, and I just can't phathom an attitude that doesn't want to know what it going on under the hood. I tear apart everything to see how it works, and don't see why Grado should be an exception. I said I wasn't going to get drawn into Rick's rant, and I know his position on this, so I'll just say, Rick doesn't need to dig if he doesn't want to. I'll add, for what it's worth, my web page never mentions what the opamp is, what value the resistors are, and it does not have a Grado schematic, so I don't really reveal much, just build quality issues.
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rickcr42
Fully Modded
Rest in peace my good friend.
Posts: 4,514
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Post by rickcr42 on Dec 24, 2006 21:38:48 GMT
it's not as much "rant" as it is fair play.You can go to the U.S. patent site and download the plans to ANY product ever thought of and then go build one which I have zero problem with it being your bussiness what you build. Where I do get pissed is where freeloaders take from others and rather than build for personal use go into direct competition with the very person they ripped off and WORSE are those whose skills are strictly knowing how to use PCB CAD software with all the real work again being done and even have to ask what size resistor to use with a LED on a nine volkt battery their skills so rudimentry (yet are an Amp Designer because they can copy plans ) DIY and "profit" do not belong in the same sentence because one is for personal use while the other personal gain at the expense of others.Even more laughable is someone paying loot for a pcb for a circuit so simple it could hhave just as easily been hard wired to a switch contact or terminal strip but THAT does not pay anyone so you will not see even a mention of "options" from those who's sole reason for being online is to make a buck.They will never say "well you CAN use my pcb for a measly $10 or if you like just solder that bitch across the switch terminals which is just as good" You designed your own amp,cool.You now have the full right to either sell it,use it for personal use only or if the mood hits burn the schematics and toss the whole thing into the wall it being yours to do with as you will but say someone copied it down to the last nut and bolt,called it their own design and even went as far as giving it a fancy name andnever even mentioned they copied it one to one from your web site ? would this not on at least some level piss you off ? And if yes imagine if the design was one you had to not only pay an engineer to design for you but prototype then build the working model and that this came it at for arguments sake $2K pre-production and that you then hired an other person skilled in chassis layout and ergonomics and that this cost you another $500 for a now cost of $2,500 that is purely out of pocket that when you added it up realised you better sell a few versions of or the cost/value/preformance ratio was one where you would have been better off buying something ready made.How would you feel if YOURS that you paid to have designed cost $500 per while some knucklhead who copied your design because you were foolish enough to release the dtails of or because some idiot reverse engineered sold EXACT COPIES for $200 ? Who do you think will be the happier party and who ready to kill something ? When everything goes to "what's in it for me" and there is no longer any code of conduct,no personal honor and in fact a slant to the devious side we are all in trouble and it is my personal opinion those who feed the cheaters buy going to them with money in hand are just as guilty for supporting the practice to shave a dollar or two (again the "ME First,screw everyone else mentality) and why I feel a particular joy when they have a deal go bad then start whimpering in the forums "what can I do ! Ohhhh...poor me...i was robbed" The old what goes around comes around theory that says if you are always trying to get over it is only a matter of time befre someone a little bit slicker will get over on you and while a REAL MAN will just chalk that up to "oh well,was bound to happen eventually and I did deserve it" the ME FIRSTers cry and moan like a simpering whimper babies.......uh....uh....uh...aWAAAAAAAH Again,"ONE OF" copies are cool and I have to say I probably have one of the most extensive commercial amp libraries in existance (both hard copy factory plans and hard rive pics) and have built versions of most just to do it so see no problem with HAVING the plans,just making copies then selling them for profit not earned. Now THAT was a rant
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Post by dsavitsk on Jan 2, 2007 7:00:52 GMT
That's one seriously well built amp dsavitsk, did you make it yourself? Quick update -- all custom wound electra-print iron. Not as pretty to look at, but sure better to listen to. Shown with a pair of 5687's -- not my favorite tube here, but not bad either.
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Post by PinkFloyd on Jan 2, 2007 15:35:43 GMT
I really look forward to seen this amp finished! Same here Miguel, pretty much the dog's bollocks even as it stands... will look even better when complete
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rickcr42
Fully Modded
Rest in peace my good friend.
Posts: 4,514
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Post by rickcr42 on Jan 2, 2007 16:36:55 GMT
for a slightly different flavor you could try the ECC99.Close to the 5687 in drive,maybe a bit more "modern" in sound www.triodeel.com/ecc99.html
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Post by jelosno on Jan 2, 2007 22:34:26 GMT
Doug, this one is slightly larger than your HPDAC as it seems Less portable as well ;D Had no time to order the parts for my boards. Rick has his already in the works but he slightly strayed away from the original design though... Greetings from the bloody hot Cape Stefan, still liking his RA-1
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Post by dsavitsk on Jan 2, 2007 22:54:13 GMT
for a slightly different flavor you could try the ECC99.l That is a good suggestion and I'll put it on my list of things to try. The 5842 is next, then the 6c45, then perhaps a 6h30. I also have a 6sn7 module, but I am doubtful of it's ability to really power the phones (though a guy on diyaudio has been raving about some B200's powered by 6SN7's, so what do i know), and I am doubtful that I will pony up the dough to buy anything but the cheapest version I can find as NOS versions are way out of control. Also, the 5687 opened up a bit after warming up for a few hours. Still not my favorite, but it is a $4 version of the 5687 I picked up for testing, so I might try a NOS 7119 to see if that is any better -- still not a particularly expensive tube, but said to be a lot better. That's good. Unfortunately, very few other people strayed from the suggested parts list. I think there is a lot of room to experiment but sadly people just soldered without thinking too much.
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rickcr42
Fully Modded
Rest in peace my good friend.
Posts: 4,514
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Post by rickcr42 on Jan 2, 2007 23:13:18 GMT
It is a total "sennheiser cans" tube being way too bright sounding for Grado use,another case for there being no "one size fits all".
nuetral is a myth there only being nuetral matchups in my opinion
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Post by jelosno on Jan 3, 2007 7:47:23 GMT
Would be me then. Sorry! Thinking is not the problem though. The understanding part is ;D
Stefan
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rickcr42
Fully Modded
Rest in peace my good friend.
Posts: 4,514
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Post by rickcr42 on Jan 3, 2007 8:04:43 GMT
When I eventually get it finished I will post the details of the blow-by-blow,hopefully a worthwhile addition to the build directions and maybe inspiration for more "off the farm" custom builds. Having a pcb with a generous area for "kludging" eases the pain of how to add stuff in without it going to hanging off the board-not a real smart idea for digital work. Where I am at right now is using LDO's for the digital powering and a Wenzel Shunt Reg for the analog making the device strictly a home use DAC. Still "fiddling" with the analog stage topology but leaning to passive IV,single stage LPF+SIN-C correction followed by a +30dB Gain stage.Even though I lean towards triodes for gain stages if I get the time/ge around to it would like to try a monolithic in that slot using the "usual suspects" that I like to plug in for Op-Amp Audio @ highish gains : OPA637,OP37,AD797 or maybe even an AD845 for its 50ma output drive and pretty good sonics
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Post by dsavitsk on Mar 6, 2007 0:18:20 GMT
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Post by PinkFloyd on Mar 6, 2007 0:54:52 GMT
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Post by dsavitsk on Mar 6, 2007 5:16:13 GMT
Thanks Mike, thats very nice. I am finally at peace with my RS-1s.
My next project is a $75 knock-off of the espressivo.
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rickcr42
Fully Modded
Rest in peace my good friend.
Posts: 4,514
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Post by rickcr42 on Mar 7, 2007 1:14:20 GMT
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