K530 costs 55 Euros in Germany :
AKG Acoustics K 530 Kopfhörer weiß: Amazon.de: Elektronik
If this is a temporary solution for you, then you should consider buying something which you can sell with minimum loss later on.
No 1st hand experience with them. Sorry.
Patrick
AKG Acoustics K 530 Kopfhörer weiß: Amazon.de: Elektronik
If this is a temporary solution for you, then you should consider buying something which you can sell with minimum loss later on.
No 1st hand experience with them. Sorry.
Patrick
Wow. Amazon UK shows them at 79 quid - in Europe just 55 euros...
Yes, I'm wondering how to sell on - this might be an argument for the portables, given how many people use ipods and the like... But before buying I'm going to follow up one or two crazy ideas I had about second-hand and see what turns up.
Cheers
Nigel
if you are a member on head-fi.org they have a very well frequented used section. I also think that they may have removed the limit for posting before you can sell something. good quality well thought through headphone purchases have good resale, some even make profit.
Well, it's over two weeks since I read this, and I'm still scratching my head... 😕 ... since I don't know what you mean I guess I don't yet know what you mean... or something... 😀
In any event, I bought the AKG K530s about two weeks ago, and haven't had time to post since then because I've been far too busy listening to music... 😀 Sounds terrific! The whole chain is a PC feeding a "Superpro" commercial DAC (the little purple one, if you've seen it - based around a PCM1794) feeding my version of juma's BF862 preamp and then the DAO and the AKGs. Sonically, it clearly outclasses my other diy efforts, although it should be said that, for various reasons, the speakers are the weakest part in my other systems, so maybe the comparison isn't fair. Nonetheless, it's interesting to note that the biggest improvement in sound is at the "extremes", by which I mean unaccompanied or nearly-unaccompanied voice or full Mahler or Wagner type orchestras. (OT: I've been listening to a download by the Prince Consort of Ned Rorem songs from Linn records. Sounds uncannily transparent and light on the DAO and is much recommended.)
I imagine the amp will only sound better when I get better headphones - can't wait!. 😀
So, many thanks to Patrick for posting his circuit and for the help. At some point I may give the DAO with Taylor a go, but for the time being I'll just enjoy how good this one is.
Cheers, and thanks again
Nigel
I encourage you to give your rating to the thread.
Just click on the top right hand corner where the stars are.
😉
Enjoy the music first, get yourself better phones, before even think about the TCS,
Patrick
Just click on the top right hand corner where the stars are.
😉
Enjoy the music first, get yourself better phones, before even think about the TCS,
Patrick
well you obviously didnt post over on headfi and announce it was your first post. the traditional welcome at head-fi is 'welcome to head-fi and sorry about your wallet' its the beginning of the end for many wallets thats for sure, aint that the truth.
congrats on the new cans, glad you are enjoying them and the DAO. the enclosure for mine arrived a couple of days ago, so as soon as I move into my new house in 2 weeks the X'd cirlotron and the X'd or maybe even just a SE version of the DAO with taylor will ....erm...follow.😛 I have SE cables for my HD600, so maybe will try that out. I have all the other parts pretty much, need a couple of resistors and need to match some fets. power suply is already built
was too late to add this above, forgot to confirm the edit
its not the absolutely most expensive hobby out there, for sure you can spend more on cars etc, but most people go there looking for a set of headphones for their ipod, or an upgrade on some cheapies they have, or even go there thinking that surey for a couple hundred they can get the best headphones on the planet. they quickly find out that you can spend a couple hundred on the headphone cable, a couple grand on a portable headphone rig, or 20k on a home rig
its not the absolutely most expensive hobby out there, for sure you can spend more on cars etc, but most people go there looking for a set of headphones for their ipod, or an upgrade on some cheapies they have, or even go there thinking that surey for a couple hundred they can get the best headphones on the planet. they quickly find out that you can spend a couple hundred on the headphone cable, a couple grand on a portable headphone rig, or 20k on a home rig
If you asked those who built it years ago, they will tell you this is probably the most underrated headamp in this forum, or elsewhere.
Bad luck for them who haven't try. They don't know what they are missing ....
Patrick
Bad luck for them who haven't try. They don't know what they are missing ....
Patrick
woudnt a more appropriate term be UNDERBUILT? 🙂
also i think this thing qualifies as a DISamplifier more than anything else no?(gain less than 1) 🙂
also i think this thing qualifies as a DISamplifier more than anything else no?(gain less than 1) 🙂
one thing is for sure... my hd595 seem to be happy with this much gain 🙂
one question:
what should be the idss of 2SA970 if i want to use it instead of 2sj103?
...and+-2,5%?
i found out that buying a lot of 100 2SA970 to get a close match is half the price of the 2sj103 100 lot. 20$ vs 40$
one question:
what should be the idss of 2SA970 if i want to use it instead of 2sj103?
...and+-2,5%?
i found out that buying a lot of 100 2SA970 to get a close match is half the price of the 2sj103 100 lot. 20$ vs 40$
2SA970 is not a FET, but a BJT. You need to change the circuit completely.
Google "tubecad taylor current source" for examples as to how.
Patrick
Google "tubecad taylor current source" for examples as to how.
Patrick
EUVL said:
yes so it would seem and there are still those collecting parts (and waiting for time) to do so. I dont need any voltage gain, only a bit of current. is it worth paralleling the output devices for headphones for this amp Patrick? for 2 stage power jfet circlotron, is .9vgs OK for the lovoltechs? reason I ask is i'm making another order while they are still available and I decided I would make both of these amps/ my friend has agreed to help me out with designing the PCB and I think I have my head around the circuit (X'd 2 stage circlotron) so i'm at parts procurement phase. really enjoyed the exchange between yourself, Grollins and papa, was gold! read through ZV8 and ZV9 for biasing considerations or lack thereof and notes on source, confirmed my thoughts that the odd second X that had me a little bemused was indeed as I though, a rough sort of Vground across the load to keep the floating supply/output centered.
so my mate is having a look at the circuit and the articals I sent him, you said to contact you when I was ready to do a PCB so here I am. of course there would bea free one for you too. i'm just using power supply that I already have and not installing a pot as its quite literally following a dac with digi volume.
i'll send you a PM later with a couple of queries if thats OK
Last edited:
I always wanted a earphone amp/buffer for my Grado RS2 and head direct RE0.
As I am no electric genius, I have just copied a some solutions and stuffed in a box with big heatsinks.
I used a Hypnotize PCB as regulator and a DAO with taylor mod P2P running and some LDRs as volumne control also P2P.
Since this is my first headphone buffer I can't really compare it anything. But I am very impressed with the sound. Had to skip my mp3's and begin with flac's instead and now it is easy to hear how bad some/most recordings are.
The sound with the RE0s is much better than without the buffer, but the Grados just sounds mezmerizing with it.
As I am no electric genius, I have just copied a some solutions and stuffed in a box with big heatsinks.
I used a Hypnotize PCB as regulator and a DAO with taylor mod P2P running and some LDRs as volumne control also P2P.
Since this is my first headphone buffer I can't really compare it anything. But I am very impressed with the sound. Had to skip my mp3's and begin with flac's instead and now it is easy to hear how bad some/most recordings are.
The sound with the RE0s is much better than without the buffer, but the Grados just sounds mezmerizing with it.
no problem mate, just lining it up really. by that you mean your actual obligations (design and test build of PCB and prototype chassis?), ie not once the project is underway right? if you could just let me know or confirm im on the right track with the jfet values i'll get them on the way. they will run out some time so I was going to get a spread of 16 x .8, 16 x .9 and 16 x 1.0.
As I hinted above, i'm flat out busy for the next while anyway, but I wanted to give you a heads up and also get the lovoltechs on the way. I have another package being sent from the US with some other bits and pieces, wanted to save shipping if I can. 1 word answer is fine; will the above spread of devices set me right? also thinking of driving the CCS with LiFePo4 battery. current draw will be too large for all floating supplies to use them unfortunately.
in the meantime we'll maybe get a rough design ready for comment. in other words I know you are a busy man, especially at the moment; and when it comes time i'm not looking for a handout, just some friendly nudges. thanks
BTW the more I read about circlotrons, the more I think they are excellent, many of the advantages of balanced operation, but without some of the issues like matching neg to pos devices, an inherently impossible task given the tempco. but power supply must be clean as clean due to the bad PSRR, how is the PSRR on your design?
is this still appropriate content for this thread? seems to have been pretty much dedicated to DAO lately.
if patrick cant answer because of too many variables, or not enough time, can you guys let me know what value you are running in your DAOTCCS? I would hope that the circlotron would be able to cope with the same sort of values.
As I hinted above, i'm flat out busy for the next while anyway, but I wanted to give you a heads up and also get the lovoltechs on the way. I have another package being sent from the US with some other bits and pieces, wanted to save shipping if I can. 1 word answer is fine; will the above spread of devices set me right? also thinking of driving the CCS with LiFePo4 battery. current draw will be too large for all floating supplies to use them unfortunately.
in the meantime we'll maybe get a rough design ready for comment. in other words I know you are a busy man, especially at the moment; and when it comes time i'm not looking for a handout, just some friendly nudges. thanks
BTW the more I read about circlotrons, the more I think they are excellent, many of the advantages of balanced operation, but without some of the issues like matching neg to pos devices, an inherently impossible task given the tempco. but power supply must be clean as clean due to the bad PSRR, how is the PSRR on your design?
is this still appropriate content for this thread? seems to have been pretty much dedicated to DAO lately.
if patrick cant answer because of too many variables, or not enough time, can you guys let me know what value you are running in your DAOTCCS? I would hope that the circlotron would be able to cope with the same sort of values.
Last edited:
Post #249 :
"I measure & fine match my JFETs which I bought ages ago from Grey Rollins pre-matched, so I have no idea or simple means to convert those Deepsurplus values to graph 26. Only thing I can suggest is to buy some with a mid-value, and do some measurements yourself to confirm."
Patrick
"I measure & fine match my JFETs which I bought ages ago from Grey Rollins pre-matched, so I have no idea or simple means to convert those Deepsurplus values to graph 26. Only thing I can suggest is to buy some with a mid-value, and do some measurements yourself to confirm."
Patrick