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post #4291 of 24765
Great to see Head-Fi's back! I've missed all you Stax contributors!

Quick query: can I use NiMH rechargeables (1.2v) on a SR-001?
post #4292 of 24765
Quote:
Originally Posted by Johnny Blue View Post
Great to see Head-Fi's back! I've missed all you Stax contributors!

Quick query: can I use NiMH rechargeables (1.2v) on a SR-001?
Quick answer. Yes!
post #4293 of 24765
Quote:
Originally Posted by spritzer View Post
Don't get me started on this POS... (I need a vomiting smiley...)

I somebody buys this he needs his head checked...
That was certainly my thought looking at the parts complement. Tube choices don't come any more generic than 12ax7s with EL34s.

Quote:
Originally Posted by spritzer View Post
Traitor!!!! Tell him to stop by here or at the other place as I miss our crazy amp talk...
Will do.

Quote:
Originally Posted by edstrelow View Post
I am not sure about the adapter cable but I thought the guy who puts Stax cables on the Koss 950 had such an item. (who is he?)
I believe that would be Alex, aka [AK]Zip.
post #4294 of 24765
Quote:
Originally Posted by tyre View Post
Hmm, that's not good news. Which model were you using? Did you use a regulator prior to the Emco?
tyre:

I just bought some more Emco units on Ebay. This time five E10s. I'm going to try them again. They're just so convenient. I'm going to try using a regulator before the Emco as you suggested. In fact, probably a simple TREAD supply, as I have one on hand. Did you ever come to a conclusion about the switchers?
post #4295 of 24765
Quote:
Originally Posted by mirumu View Post

I believe that would be Alex, aka [AK]Zip.
That's the guy and this is the adapter for the Stax SR001 to 5 pin.

APureSound - Where The Music Is Always Pure
post #4296 of 24765
Quote:
Originally Posted by mirumu View Post
That was certainly my thought looking at the parts complement. Tube choices don't come any more generic than 12ax7s with EL34s.
It's just like the dozens of power amps designed in the 50's and onwards. For 9500€ I would expect something special, not a clone of a vintage 300$ amp in an ugly case...

Quote:
Originally Posted by mirumu View Post
Will do.
Thanks
post #4297 of 24765
well probably they use this tubes coz they are good - but amp. is really insainly priced

--> what kind of parts did You use in your blue hawaii ??
post #4298 of 24765
that was to spitzer of course
post #4299 of 24765
Quote:
You mean the AC input for the amps that drives them right? I thought voltage bias for the actual headphones were much higher.
yes I mean the AC input


Quote:
Quote:
Originally Posted by Johnny Blue View Post
Great to see Head-Fi's back! I've missed all you Stax contributors!

Quick query: can I use NiMH rechargeables (1.2v) on a SR-001?
Quick answer. Yes!
+1 on that
post #4300 of 24765
Quote:
Originally Posted by luvdunhill
I just bought some more Emco units on Ebay. This time five E10s.
I also bought my set of 5 from the same guy, even though I only needed one or two. I paid about twice as much as you did though. :/

The E10's ripple is .03% of the output voltage. Your F08's ripple is .1%. So maybe the E10 will be a slight improvement. For some reason, none of the Emco datasheets mention the switching frequency of the oscillator, although high voltage converters are probably never considered for audio purposes, so it's irrelevant to their usual customers.

Quote:
I'm going to try using a regulator before the Emco as you suggested. In fact, probably a simple TREAD supply, as I have one on hand.
Yeah, I'm going to use an LM317 based power supply. Fortunately, someone's already done the math for us. Here's an ESL power supply schematic, also using an Emco with a 12V input limit. Here's a link to the website.

ESL Bias Supply Construction



He's using the negative output to bias the diaphragms in that schematic. I've read elsewhere that this is not a good idea as it will attract dust to diaphragms. I'll probably end up using a variation of his, except using the positive output.



Quote:
Did you ever come to a conclusion about the switchers?
I still haven't used one yet as I don't have any of my electrical parts handy.

It's still unclear to me how much noise/AC ripple is acceptable in a bias supply. But I get the impression that the quality of the bias supply is not particularly important, especially after reading that thread you started over on diyaudio asking the same question.
post #4301 of 24765
Quote:
Originally Posted by tyre View Post
Yeah, I'm going to use an LM317 based power supply. Fortunately, someone's already done the math for us. Here's an ESL power supply schematic, also using an Emco with a 12V input limit. Here's a link to the website.
On another tangent, a 12V input seems a bit more conducive to the use of batteries too although I see these E series converters use about 3 watts. Emco also have a Q series with consumption closer to around 0.5 watts. The ripple is worse on these but with a regulated battery source I wonder if it would be so much of an issue?

I need to build a bias supply anyway (just signed up to Digikey tonight actually) and would be keen to try myself, but there's no sign of any Q series converters on Ebay nor can I find any retailers using Google. No sign of any more E series models either actually, it looks like you guys have cornered the market on them.
post #4302 of 24765
I got lucky with an SR-001 Mk2 off eBay, it's just turned up in the post and my initial impressions are:

a) it's tiny! (I'd only ever seen pictures, so was shocked at how small the combo is and how light the parcel was: I thought the seller had forgotten to put them in!)

b) sound is great: very different from the Lambdas (modern) and the SR-X/SR-5s (old) but still with that basic lovely Stax clean-ness.

c) comfort! (once I'd prised them out of the vice-like grip of the headband and just stuck them in my ears, I can forget they're there! Unlike the others, which have varying degrees of discomfort after a time... )

These are SO good! And portable! (Not that I'm off to Death Valley any day soon: Ashdown Forest more like!)

Now I'll have to start thinking about one of those adapters that APureSound makes, just to see what the S-001s sound like driven by a bigger amp!
post #4303 of 24765
Quote:
Originally Posted by derekbmn View Post
And again where is Carl !?? Anyone know ?
Yes, where have he gone?
Its been over two months (Last Activity: 09-25-2007 12:12 AM) since last time he visited the forum...

Sure hope he is fine, and that nothing have happened to him!
Quote:
Originally Posted by milkpowder View Post
Actually, there is something interesting to report. In fact, it's pretty big news.
Clicky here! Out of my price range, but what does the Stax Mafia think?

Is a 120dB S/N ratio even realistic for a tube design?
Looks interesting.
But with a price tag of €9500 I am quite sure the Coriolan wont sell much. Its just insanely expensive for what it is, imo.
Quote:
Originally Posted by audiod View Post
Glad Head-Fi is back!

My SR-007mk2 now has hundreds of hours on it and I still have the same problems with them (veiled sounding, not as punchy in the bass, and less efficient than my 007’s). The mk2 sounds great till you go back to the 007. They are much better than when I first listened to them but the 007 is still much better IMO. I talked to the Stax USA agent and he told me that Stax Japan would like to see my set. Stax USA also wanted to wait for the next shipment (the next production run) to replace my unit even though they have mk2’s (first production run) in stock. The next shipment is due by the EOM. The saga continues….

AudioD
Sad to see that the 007mk2 still are having major problems.
But nice to see that the distributor and Stax gives you great support and want to check out this particular pair. Then give you a new one.

Hopefully its just your pair, and nothing general wrong with their production line. Guess we will just have to wait and see...
Quote:
Originally Posted by mirumu View Post
I can say nothing bad has happened. Been chatting with him elsewhere within the last half hour. I don't know any reasons why he's not here much lately, but I do know he thinks he spends too much time posting on forums. He also has other expensive hobbies so it may be an effort in avoiding temptation.

Edit: I asked him and it's just like I thought. He just posts on too many forums so tends to disappear from them from time to time if he doesn't have the time to spare.
Great to hear!
At least he is running stong, and might get back to us some time...
Quote:
Originally Posted by pipoplus View Post
I acquired my second Stax today; this time the portable one the SRM-001 headphone/driver combination.
After puting on some new earbuds the headphones are sounding pretty good!
Anyone knows what the acoustic difference is between the old SRM-001 and the the newer MKII version?

anyone has an adapter cable for it so I can use it on a big driver?
Congratulations!
The SRM-001MK2 sure is a great little system.

There were no changes to the SRM-001 during the mk2 update. Only the phones were updated (from S-001 to S-001mk2).
Alex ([AK]Zip) might be able to help you with an adapter cable. At least he offered to make me one last year.
post #4304 of 24765
Quote:
Originally Posted by tyre View Post
I also bought my set of 5 from the same guy, even though I only needed one or two. I paid about twice as much as you did though. :/
heh, I'll probably just relist the others and keep two. I have two jacks on my amplifier and I'm thinking about one adjustable and one fixed bias using two Emco supplies. I recently milled my end plates and have room for a pot, two tip jacks, and a switch. The switch was for a "high-low" option, but I'm not sure I'll need that now. I'm looking into multi-turn panel mount pots at this point, probably will go with either Mouser M43P102KB40 or Mouser 652-3006Y-1-102Z-LF. I've never used these types of pots, but figure they should be better than the standard Alpha carbon types. opinions? Depending on how much room you want the output the vary (I'm thinking 300-650V) and looking at the datasheets, I can guess what voltage input range that will be (4-10V) but I'm going to measure once I get the parts and then go from there.

edit: I will most definitely have to use a 15 VAC input to the adjustable regulator, as I already have this available in my psu chassis and I have run out of room for more (even small) toroids. (I have 4 toroids now!)

Quote:
Originally Posted by tyre View Post
The E10's ripple is .03% of the output voltage. Your F08's ripple is .1%. So maybe the E10 will be a slight improvement. For some reason, none of the Emco datasheets mention the switching frequency of the oscillator, although high voltage converters are probably never considered for audio purposes, so it's irrelevant to their usual customers.
yup, i agree. Also, I'm wondering if the unit itself was emitting some RF noise or injecting it back into the mains voltage, perhaps that was the issue I had before? Do you think any shielding would help? I'm thinking about adding a DC filter in addition to my EMI filter. I did this on a phono pre that I made. I used the formula from here:

DIY Audio Tips & Tricks

Quote:
Originally Posted by tyre View Post
I'll probably end up using a variation of his, except using the positive output.


one thing we might consider, is a diode and cap similar to this schematic:

http://www.emcohighvoltage.com/CM1.pdf

the diode is just simple polarity protection, but caps on either end might be of some benefit. Like I said, I am recycling a tread supply and I expect it will work well, but it doesn't have an capacitance on the output and expects the power-ee to have some rail capacitance.

Quote:
Originally Posted by tyre View Post
I still haven't used one yet as I don't have any of my electrical parts handy.

It's still unclear to me how much noise/AC ripple is acceptable in a bias supply. But I get the impression that the quality of the bias supply is not particularly important, especially after reading that thread you started over on diyaudio asking the same question.
yup... also the current demands are unclear to me, though Spritzer thinks (knows? ) it can peak in the mA, I'm thinking more like uA.

Spritzer:

Since I have an available switch, do you think a 4.7M / 5M constant charge resistor option would be overkill? I guess it can just sit there and look cool (:
post #4305 of 24765
Quote:
Originally Posted by piotr z View Post
well probably they use this tubes coz they are good - but amp. is really insainly priced

--> what kind of parts did You use in your blue hawaii ??
That is a horrible tube compliment but it used a be a popular one. The 12ax7 is a toy and the EL34 needs a better driver. An amp at this price level shouldn't even be using crappy pentodes...

My amp was built by Headamp with every upgrade available at the time. It needs an upgrade quite badly but I always have some other project I'm working on...

Quote:
Originally Posted by luvdunhill View Post
yup... also the current demands are unclear to me, though Spritzer thinks (knows? ) it can peak in the mA, I'm thinking more like uA.

Spritzer:

Since I have an available switch, do you think a 4.7M / 5M constant charge resistor option would be overkill? I guess it can just sit there and look cool (:
The current is hard to nail down as it depends on the diaphragm and what it happening but the Beyer ET-1000 shows that there really isn't such a thing as too much power. They leak bias and go through a few 1uf caps in a minute or two.

Are you going to switch between 4.7 and 5m? That would be totally unnecessary but a 5m in series with the 4.7 would be good for non Stax phones.
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