fillemon

hello, some remarks; 1) i have seen delay cicuits for the b+, so that after 30 seconds or so, the tube is hot, the b+ goes on, it was full SS. So that could be an option. I know that the advantage of tubes rectification is the slow upcoming b+. Still i thought that giving it a very fine psu would do the extra bit. still the price for that is quite big. 2)okee, we are on the hunt for big output caps, i'm gonna design it for 32 ohm, maybe i'll jump on the grado's, i have so many akg already; time for someting else maybe. 3)well i thought that kiwame didn't had all the values, i will get kiwame for those in the signal path 4)yes i have looked at ducans page lots of time, very nice software indeed. 5)very good remark on the balanced topic: wait and see how the non balanced sounds. thanx people oh again two posts while i was typing. 1)very true on the psu thing, you can't put a big cap after a tube in the psu, and indeed chokes are very expensive if you want decent ones. 2)hear your diodes, well that's what they should call: golden ears

that's true, there is no prob, but what do you think of the remarks ?

yes i have seen that, but he will only offer 33uf for example. so for low impedance caps it won't work i think. and i would like to know what people think of my comments so that i can learn a bit. still thank you very much for the link greetings fillemon

okee, i have looked around a bit; so here is what i still need to ask. i will need to build the low impedance aikido for akg or grado's. 1)i probably need to build the low impedance aikido (i thought i red somewhere the high is better although you have a low impedance headphone : is this correct) 2)the ouput cap should be 470uf, so scheme on the internet pop up with 47uf. 3)i assume it has to be 470uf (well with a 64ohm akg it might be 220uf i suppose) but i would buy an photoflasher cap. what do you think: i have also looked at obligato caps, or maybe asc; but you can easily loose 100 dollar-euro for these caps, at that price i'm willing to double the money and buy a very decent small output trannie. If of course i buy an photoflasher and bypass cap i can be settled for not much money. 4)for resistors i would use holco/kiwame cause the dollar euro ratio is so low, and in absolute costs it is not that much 5)i would use jj caps in the power supply 6)how much difference is there on a tube or ss psu ? i have an old trannie of a el84pp, i could use it maybe. 7)if the cost price is not that much more, i dare to go for balanced, have to mod the new headphone, but that is not scary what do you think thank you so much people

thank you so much, i'm on it.

hello loser101, thanx i will take a look at the headfi org. i have bitten the bullet, i will build an otl stereo non balanced aikido. and it has to serve an akg k701, i know it is 60ohm impedance, not the nicest load for an otl. i'm gonna order some boards at glass ware. i will use normal parts, nothing special, but i would like to know where you can buy 6CG7 input and 6H30 output tubes for cheap and what brand i should get, also the ouput cap if i use an 60 ohm load, then the cap should be around 470u, what kind of brand do you think is good. (i have heard that there are non poleraised in RS or other big shops which are quite good: i have red this on grotto forum for upgrading X-cans) and what kind of psu do you use for your aikido ? thanx a lot greetings fillemon

hello, i will certainly uses the pcb, it is very easy then. well it depends wheter i want OTL or an trannie. i want to use an akg 701 on it that is an 61 ohm i think, i also have an 401 and 500. they both are 120 ohm. a lot of threads are making an aikido preamp into an headphone amp; while now these days there are "dedicated" headphone tube aikido's. i need to take a better look on the site to see what are the offerings. if i would use a trannie, then i don't think it matters that much. But off course not having an trannie, i will have to limit the choise of tubes. a lot of questions, but i don't get it at this moment, to much options. gonna read a bit first, so that i don't have to ask the same questions.

thanx alot, i have looked again, and i spy with my little eye, that you can buy almost a kit, that's easy for a start. maybe i'll do it, i can go with ot without trannie, will read more on it. the price is ridicoulsly low. gotta love the man for that

well i know i can be toasted for that kind of comments here, that's why i say it loud, that i have never listend to them. i know the glass tube site quite well, and i'm fond of it long time, the articles are very instructive, so i'm not saying that it is not good, not at all. what did i build, well a dac, but then again it was a kit, it is a non ovesampling very basic thing also know as a "monica" and i have built an tripath amp, the charlize, some speakers: bob brines ft1600mkII and a coral flat 8 full ranger. i have worked on some tube amps, but only to replace caps or other parts, and things like that (for friends). i have an old el84 push pull , but it is wrecked by the previous owner, so that is a drag, even the trannies are not in a good state. he used brute force, which is not the way to go around with electronics. in my humble opinion. well i'll go off and look again at the aikido. but it needs a trannie, and the link i posted, that guy build them both, and he told me that the aikido is a very fine preamp, and can be a very fine headphone amp, but the single ended ec99 beats it, (only by a bit), but being so simple : the ecc99, and not needing a lot of parts and tubes, i would prefer that one, still i'm gonna look again, you never know what to see there okee: the interface told me that there were 2 new posts: nice i will answer them too. i will not fry myself, for all those years never been electricuted, i'm very scared of it, i use to place electricity in swimmingpools as a student job (the underwater lights: always playing very safe with it) well that it another + for the aikido, i will even look with grater care to it. but what kind of tubes you were listing at the aikido ?

well i have been working around with high voltages, not with 1000 volts like an 845, but the scheme i have is with plain 240 volt, i know very dangerous, but i'm actually a bit very scary of it, so i take enormous precations, when i work on things which are powerd by more than a few small aa batteries. well i have looked into the aikido and this is one of the designs i was willing to build. the link i have posted: that guy also made the aikido, but he told me the se ecc99 was the better one. i know transformers are expensive. but i live in europe and will order them at www.ae-europe.nl : a very high end manufacturer, made to measure, and no that pricy at all. the complete set trannies for a 1 watt SE is around 400 euro for the good ones, you want better (amorf) then it is something like 750, you want silver wire (double it and you are there). but to be quite honest, i don't think an aikido can match up a supra, (not that i have heard any of them : so i admit it is very biased: but i just make this conclusion from reading the internet. (not that is a good starting point but still). so you suggest not to go with an 6sn7 for its price ? they range from 10-60 euro and indeed 60 euro's is indeed a bit of money, where an ecc99 is only 10 and brand new with a lot of hours to burn.

well grawk, i guess you are right. but what publicly design matches up ? i have red all around that a 6sn7 is a great tube for headphones, as well as ecc99 i know there are tons of good tubes around, but i don't wanna go in expensive tubes. cause i end up listing something like 10h a day. so you will never see me building a headphone amp with a 300b, 245 or things like that. i would like to build it otl, but than again, a good cap to replace the trannie is very costly to. so that wouldn't make any difference. there are indeed a lot of good designs, but few of them build a lot of those and mostly they are always quite good, but witch one is the better one( i know a very subjective question, and also: what headphone, cables, dac.......) i would just like to know what you would build if you would had to do it right now. i 'm looking at http://members.home.nl/deckersmoll/Blue%20Ear/Blue%20Ears%203.GIF it's easy, not that much parts, the only thing that costs money are the trannies. but they can be wind with all sorts of tabs. (primairy as secondary). so i could use it later on for other tubes, (well i don't think i will build something new if it sounds good, just don't have the time for it, or the money) thanx a lot already

hello people, i wanna build myself a decent headphone amp. so i thought maybe of building a supra. it uses 3 6sn7 or 6 (if you wanna do it balanced) did anyone do this before ? what are the costs ? does anyone has the schematics ? does anyone know a better amp for that price ? i know it is otl, and some are for otl, some are for trannies. i just don't know what i'm up to. i would use it on a akg 701 which i still have to buy. i need help guys, thanx a lot