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The Stax Thread III - Page 165

post #2461 of 3287
You cant use an ordinary multimeter (maybe you can if you know the resistance of the multimeter and the layout of the srd).
Too high bias = not good
Too low bias = okay
post #2462 of 3287
Just got a pair of new 007Mk2 . They're even the dreaded sz3's. I know it's usually "Mk1's or go home" around here, but these are actually a very fine headphone in their own right. Compared to my 507's they have more depth, resolution, and better imaging. And though they may be a bit bright on top compared to the Mk1's (which I've heard many times), they are nowhwere near the 507's in this area. Many of the Mk1's I see at meets are starting to show their age. I passed on a couple of used ones. With the kind of electronics I use, (NOS dac, all tube DIY amp) a little extra energy on top and a hint of bass bloom might even be a good thing. On all-tube amps, the Mk1's, to me at least, can sound a little remote. I'm actually a bit surprised and pleased, as no way could I ever afford an 009. The three previous Lambda's I've owned have never really meshed with my tastes in music (mostly classic rock) or electronics (analog / tube). These pull it off. Definitely worth a look.
post #2463 of 3287

Congrats Frank.

Your stunning amps make any Stax sing. 

post #2464 of 3287

I thought one could get an idea of whether the Bias is in the right ballpark by measuring between Ground and the final 5M load resistor (ie not at the headphone pinouts)?

 

I am trying to both check the Bias and adjust the unit to run on 240V as it is a 100V only Vintage Japanese SRD7. - It is also a very early one, as the circuit is not the later SRD7 circuit but a slightly modified SRD5 circuit....

 

I have fitted the 250k resistor (replacing the 50k resistor, actually a 270K R as the local electronics store was out of 250k's would like to confirm what would be the ideal R for this position given local power voltage is 240V but tends to be 245V on average, and sometimes as high as 252V) - as per the SRD5 240V switch position....

 

But right now I still have it running on 110V - and have measured 70V before the load resistor.

 

 

At the pinouts I measure 47V.

 

I expect that when I switch to 240V the V just before the 5M resistor should jump up to around 154V - and based on other peoples measurements (using Multimeters) of bias voltages I have a feeling that this is right in the ballpark given the limitations of a 10M impedance DMM.....

 

Looking for some form of confirmation.

 

Also if anyone could chime in with what would be the ideal R for that initial power input resistor that would be great!

 

Is optimal performance achieved with the standard spec 230V bias, or is there a gain from running marginally higher bias? And if so what are the safe limitations for long term life of the headphones?

 

It seems I may be able to "tune" the bias by selecting the right input R...

 

thanks

 

David

post #2465 of 3287
Hi Frank
What NOS DAC have you got?

I endorse your point about the 007s Mk2.5. I had a pair for 12 months and loved them with my Audio Note NOS DAC front end.
They get slated here, I believe too much IMHO. With a balanced system (components that gel together) I think they offer one of the best headphone set ups available. Yes, the bass is slightly bloomy maybe? And the mid to high treble slightly recessed. I did not feel it was loosing much information or enjoyments regardless. In fact I would say the 007s are a better match for many modern SS DACs.

I have now got some 009s which are quite a different signature, more 507 on steroids than a development of the 007s. The 009s have a wider soundstage, more detail and about the same bass as the 007s but more texture and a bit more low end response and slam. The increased detail of the 009s takes the experience to a higher level and a more realistic level I would say, but to do that successfully I think the 009s need a clean front end even more than the 007s do. No where to hide comes to mind.

I'll know more on that once I get my KGSSHV built. I kinda miss my 007s right now, but it is not financially possible to keep both for me, and the 009s just give me more music. There is no denying the 007s signature though, it also has it's merits.
post #2466 of 3287

Right now I'm using an Audio Note 2.1B kit dac. I just purchased a used Metrum Hex. Should be here in a few days. Been on an upgrade binge recently due to cleaning out years of accumulated  tubes and components. The real fun will began when my best effort at a Stax system will go head-to-head with my best effort at an LCD-3 system. In the end, only one will stay.

 

Your impressions of the 507's and 009's mirror my own. My favorite Stax has always been the original Omega. Wished they'd taken the 009 more in this direction.

 

Greetings Gilency! Appreciate the complement! Hope to see you in August at the LA meet with your Megatron.

post #2467 of 3287

I'm looking for your comparison between the AN and Hex ;)

post #2468 of 3287
Quote:
Originally Posted by FrankCooter View Post
 

Right now I'm using an Audio Note 2.1B kit dac. I just purchased a used Metrum Hex. Should be here in a few days. Been on an upgrade binge recently due to cleaning out years of accumulated  tubes and components. The real fun will began when my best effort at a Stax system will go head-to-head with my best effort at an LCD-3 system. In the end, only one will stay.

 

 

That mean the Octave lost out to the AN kit?

post #2469 of 3287

A little off-topic, but I do own a Metrum Octave. I like it a lot. Despite being radically different designs, the Metrum and the Audio Note sound very similar. The Metrum is a little quieter and a little tighter in the bass. The Audio Note is a little lusher and more analog sounding in the midrange. Both are distinctively different from the majority of modern high-end dacs, and both would probably be considered somewhat rolled-off and sluggish by most modern audiophiles. Basically I'm looking for a digital version of a high-end vinyl sound. So far, these two are as close as I've been able to get. Hoping the Hex takes everything up a level. It was a coin flip  between the Hex and upgrading the Audio Note. Went with the Hex because because I got a great deal.

post #2470 of 3287

...try a fully loaded Empirical Audio Overdrive SE (with the Hynes upgrade). It has that lush midrange and warmth, and is very 3D holographic... but is also extended at both ends; with bass that can hit hard (with the right amp and speakers) and no top end roll-off. Not cheap ($6,400), but I really like it in my system with the Stax 007; now I see the only weak link is my Stax amp. And don't rule out the Hugo. Maintains the wonderful vinyl-like midrange of the Chord QB76, does DSD, and costs so little (comparably). It really does give a lot of high end DACs a run for the money. Anything Rob Watts does might be right up your ally, as Chord's midrange is very good throughout their digital lineup.

 

I've had the usual candidates (Berkley, Weiss, even a top-end Dodson) in my system for trials and the two closest to vinyl were Chord DACS and now the Empirical OD. Granted, I haven't listened to the Meitner, Esoteric, or the other real big boys except at shows, but many of those I find too clinical for my liking anyway. Best I've heard recently besides the two that I own is new PS Audio DSD ...way, way better than the old PerfectWave and smooth like butter on everything.

 

If none of those tickle your fancy and you want the best old-school; then look/listen/feel? some of the better NOS DAC's (Gordon Rankin's Wavelength stuff comes to mind). I also heard Triode at the show in Chicago. (The Japan company, not the Canadian one). All tubed DAC, preamp and those giant tube monoblocks...man those things hit hard with enough slam not to make me think of SS amps or SS anything. That was tubes done right. I'm sure a lot it had to do with the massive $22K amps, but their front end was very good too, and not outrageously priced. When I put my Chord Hugo in the chain it also sounded good; though again, the tubed Triode DAC had somewhat better synergy with this system. Triode takes this, and the Acoustic Zen speakers around to most big shows, so have a listen...this is digital done right...and the extensive listening I did was mostly 44.1 burns of CD's...nothing hi res.

 

Anyway, that's my ear milage for the past year. Hope that helps.

post #2471 of 3287
Quote:
Originally Posted by FrankCooter View Post

Just got a pair of new 007Mk2 . They're even the dreaded sz3's. I know it's usually "Mk1's or go home" around here, but these are actually a very fine headphone in their own right. Compared to my 507's they have more depth, resolution, and better imaging. And though they may be a bit bright on top compared to the Mk1's (which I've heard many times), they are nowhwere near the 507's in this area. Many of the Mk1's I see at meets are starting to show their age. I passed on a couple of used ones. With the kind of electronics I use, (NOS dac, all tube DIY amp) a little extra energy on top and a hint of bass bloom might even be a good thing. On all-tube amps, the Mk1's, to me at least, can sound a little remote. I'm actually a bit surprised and pleased, as no way could I ever afford an 009. The three previous Lambda's I've owned have never really meshed with my tastes in music (mostly classic rock) or electronics (analog / tube). These pull it off. Definitely worth a look.

Totally agree with you, Frank! My O2.5 is sooo sweet and inviting, that I could almost care less that it's not 100% neutral. It does the wrong things right smily_headphones1.gif Even so, I find the 007 Mk2.5 sounds very, very natural, mutch more so than any other headphone I've ever heard
Edited by mangler - 6/2/14 at 5:38pm
post #2472 of 3287

I send in two email requests to Stax USA, was thinking of buying a pair of 007mk2's or maybe even 009's. 

 

They never replied. 

 

Seriously?   The company gets bought and they don't fix the horrendous US customer service?

 

I'll never buy a Stax product until they straighten out their US distributor and it looks like they never will. 

post #2473 of 3287

You might want to instead contact a dealer such as Headamp, Woo, etc. Though I believe they're currently out of stock on the 009's ATM.

post #2474 of 3287
Quote:
Originally Posted by Jodet View Post
 

I send in two email requests to Stax USA, was thinking of buying a pair of 007mk2's or maybe even 009's. 

 

They never replied. 

 

Seriously?   The company gets bought and they don't fix the horrendous US customer service?

 

I'll never buy a Stax product until they straighten out their US distributor and it looks like they never will. 

 

You know, I've been looking into getting into electrostatic headphones, mainly looking at entry level systems like the SRS2170 and the Koss ESP950.  I was wondering how their warranty and service was like, and honestly, this doesn't exactly inspire confidence.

post #2475 of 3287
Quote:
Originally Posted by AnalogSavior View Post
 

 

You know, I've been looking into getting into electrostatic headphones, mainly looking at entry level systems like the SRS2170 and the Koss ESP950.  I was wondering how their warranty and service was like, and honestly, this doesn't exactly inspire confidence.

 

DEW EET! ^^^

 

Wha? The Koss ESP950 lifetime warranty - no questions asked, doesn't inspire confidence?

 

On that note, Stax just sux. One just needs faith and a little luck.

Correct handling of electrostat equipment also goes a long way to ensure it's survival.

 

I own the SRS2170 and it's all broke now.

It did give me two years of exceptional sound quality for the price I paid. (~$500 new at the time)

It is unfortunate their stuff isn't built to a higher standard.

So the moral is: if your wanna play you gotta pay.

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