Headphone Amplification

Hi stax experts, I measured my t1w bias voltage, the pro bias port is 420v and normal bias is about 150v, is this normal or something needs to be replaced? Thank you.

I have a 100V SRM 323A that I am trying to rewire for 120V. I haven't been able to find a diagram for the transformer, so I was hoping that someone could help me figure out how to rewire it. Right now the yellow, white, and grey wires are connected to one side of the plug and the brown and green wires are connected to the other. The blue and orange wires have been cut off, but I should be able to reconnect them with some careful soldering.

Since i finally registered, i thought i might as well enquire, can't hurt; Very recently finished building my SRX Plus, tip top on all mats minus the pot which is a TKD CP2500, gets a bit too steep from there What that sounds like, most of you already know, so will skip this part. Am currently pairing it with a DIY DAC that's based on an old dual PCM-63(P) Elektor magazine diagram that i've beefed up considerably. DAC as is now has great punch, bit of pompous a character if i might put it thus and is rather partial towards its lows/mid-lows; what you want as a source when pairing with an electrostatic amp and aiming for a balanced system. Dances circles ar…

Hello all! I'm looking for a decent but cheapish DAC/Amp that has significant negative gain, and was wondering if anyone knew of anything? I'm using it to connect to my digital piano software, with which I use a pair of Etymotic 4XRs. At standard levels and 0dB gain I usually need to attenuate by at least 24dB before I can even get close to half volume with most pots. I'll add that I'm also using it at relatively low output levels because of my messed up ears, so it really would be nice to have some meaningful volume range without having to use massive digital attenuation. Also, using that kind of digital attenuation still leaves the amp itself at a much higher outpu…

Hi, Has anyone tried the Antares? How does the circuit design and specs look? http://high-amp.de/html/antares.html Thanks

I recently got a srm-313 with two pro bias, the voltage is japan 100v, does anybody has experience to convert it to 120v us standard? Thank you very much. The amp is still on the way, I found the internal photo from here,

We’re launching a new company – Eksonic – along with our new amplifier called Aeras. Launching an audio company is something I’ve had in the back of my head for many years and I’m proud to be able to bring a passion to market. I've been building my own version of the DIY T2 for quite some time now and have long hoped to capture the spirit of the beast in a smaller single chassis design that's more accessible to many. We think we've accomplished that with the Aeras. Aeras is the result of endless hours of circuit design and analysis, brainstorming and many iterations of prototyping and testing. Our initial users have had great things to say about…

Hi ! I get this unit, but I'm confusing with offset voltage - I measured the output offset voltage and it is far from 0V - I do not know if these stax amplifiers have that, but mine has, respectively: 8.8V, 5.4V, 12V and -0.6V? Electrostats are rather new to me, but here the DC voltage at the output should be close to 0V, as in conventional amplifiers? Is it not damaged? Does anyone have a list of the correct voltages in this model?

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My M22 will not power up. I worked fine earlier in the day yesterday. I shut it down for an hour and it would not power up again. I took off the bottom and the fuse seems to be intact. Did not see any issue with the power cord connection inside. Any suggestions on where to send for repair? Thanks.

The Fidelix Staccato There seems to be a Japanese maker of high-end audio equipment that makes his own Stax driver. Looks very cleanly-made, but I don't know how much of this is a unique build versus knowledge already known in the Western Stax community. I'm particularly interested in hearing the DIY group's thoughts on the simplified schematic he's posted. Is this anything unique/interesting? Or just a rehash of existing designs?

Am I late to the party? https://www.massdrop.com/buy/headamp-gilmore-lite-mk2-headphone-amp It's pretty cute, I regret not grabbing a mk1 unit over all these years. I like the knob!

Dear All Due to sudden voltage spike last night - my stax vaccume tube amp srm007TA diode burnt out. Can you guide through the process to fix this issue? I have attached the images below for reference. Hopefully the PCB seems to be intact. But i am not a expert and any advise is highly appreciated Thank you

Dear All - What tube improvements can be made to Stax007tA over the stock tubes? Are matched pairs available or is there any change needed to be done to the board? Also any recommendation on exernal PSU to improve SQ? Thank you

Can you help me with schematic of Stax SRM007tA amplifer please ? (100 V Japan version)

Hi! i would like to share my work with you. I made an dynalo amp powered by grlv power supply and a pcm1794a/cm6631a dac. Everything is totaly made by me. I also designed the pcb nd ordered it from JLCPCB. Amp offset voltage stays at max +-1mV and it is totally silent. Case is DOUK AUDIO. pictures: https://drive.google.com/drive/folders/1a6cbGFpN6s5EadR8DA_lb21ZFwOwzK4R?usp=sharing

Two new amps have just been announced: https://stax.co.jp/products/srm-700t/ https://stax.co.jp/products/srm-700s/

Hello I am pretty new here and am seeing some really impressive knowledge on this site. I looked but did not find anything on changing the voltage from 100 to 117 on an RSM717. I saw a post on the 727 which someone also said was similar. It looked like on that, the leads were cut from the transformer and that did not look like fun to do. I can measure resistance, voltage, etc, but don't have the expertise to do what some of you guys can do. If there are step by step instruction (esp with photos) I can do it. I don't see a lot of posts that are dumbed down to that level though. I also was wondering if there are any mods to be made on a 727 that would make it a b…

Hello all, I have this unit, but it stopped working so I opened it up. It seems that in right channel are shorted mosfets on output stage. But LEDs are not lit on both channel so I need to check it more. I started drawing schematic from the board. Since this is only one sided pcb, it was easy. But there is one thing I don't really understand. It is the cascode pair of 2SA1699. It should be that emitter is connected to the drain of the 2sj109 and output is at collector. But there it is connected differently. Or there is something I don't see. If we look on the board, there is drain of the 2sj109 and it is connected to the base of 2sa1699 according to …

Hello, looking for Info where to find a new trafo for my KGST headphone Projekt. Thanks for Info Bart

Hi, been lurking for a while but finally signed up! Quick background on my gear: I'm in the Stax ecosystem with an L700(Mk1), SR-3, and an SRM-003. I also have a D10 and T1S, the latter of which was on a shelf unused in the original box for 25 years or so and last year I bought it. I'm still planning to recap it and upgrade it with the constant current mod, but that's to come soon. In the meanwhile, I came across a curiosity online, a homemade normal-bias tube amp. No real info provided, but it was a reasonable price so I took the shot in the dark, and I don't have the electronics knowledge to grok what I'm looking at. Can anyone more educated help me?

Hi all, I’ve lurked here for a while but am active in the other regular forum. Apologies for the cold post here, but after a trade and drunken bidding on Yahoo Auctions I find myself with both an SRM-T1S and a 006t (both have pro and normal bias outputs). I would like to get the CCS mod done to one of them, likely the 006 which I would then keep. There’s likely no way in hell I would trust myself to do the mod, though I have JimL’s article. So my post is to find someone who could upgrade my 006t with the CCS mod and whatever other upgrades and updates (and voltage change) you feel would be worthwhile. I’m using it to drive (primarily) an L300LE and a NB La…

Hi, Folks! Aren't there a time to try something new? What a headamp would you like to try? Of course, A-Class, of course "No Miller capacitance", of course "Balanced". Do we need new beasts? Aren't there a time to brainstorm or public dispute for the new designs?

Birgir finally has his hands on the SRM727, and evidently does not like the thing at all. Extended comments hopefully coming from the big guy soon. Comments on the 300 should also come soon once he can get his fingers inside the chassis to rewire the transformer. I've come to the conclusion that the srm323 is stax's best sounding amp that is still in production.

Hi, Newbie here. I bought a pair of Stax SR-404 Signature and want to build an energizer/amp myself. I'm not a big tube fan, although I can see the value in using them. Instead, I'd like to build a fairly compact solid-state version. Does anyone have any links or references to interesting designs? Thx D.