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The Stax Thread III - Page 163

post #2431 of 4004
Quote:
Originally Posted by dlaloum View Post
 

Hi Folks,

 

I have an SRD7 - which is not working...

 

It appears to have 3 resistors that have been  cut in half (!) - 51k, 100k, 1M - and it is therefore delivering no bias.

 

It is an early 100V only unit - all the circuit diagrams I have found are for the later multi-voltage units

 

The other strange thing is that there is no 51k resistor on any of the SRD7 schematics, but it appears on one of the power input lines of the SRD5 schematic.

 

So it may be that I have an early production SRD7 with a circuit closely related to the SRD5 (I have not traced the circuit... was hoping not to have to !)

 

Does anyone know a tech in Melbourne (Australia) familiar with Stax headphones and energizers who could help with getting this beastie working again?

 

bye for now

 

David

 

Hi,

 

what about just replacing the resistors and see what happens? Although if you don't feel at ease with a soldering iron and line voltage, better let sb do it.

 

As for voltage I think they were all capable of up to 240V AC since they use a zener diode to cap the AC coltage at 82V and then double it but some didn't state so on the box... Here's the schematics anyways - http://img99.imageshack.us/img99/6717/srd7ij0.jpg

If you want to play it safe and are in 220-240 country - use a converter - it doesn't draw a lot of power.

 

Joachim

post #2432 of 4004

I'm trying to find a comparison between the KGSS-HV and the BHSE and the closest thing I can find i s Asr's old mini-review of the BHSE and a regular KGSS.
 

Has anyone done a comparison of the BHSE with the KGSS-HV?


Edited by dreamwhisper - 5/21/14 at 8:23pm
post #2433 of 4004
Not sure how relevant a comparison review would be between the DIY built KGSSHV and the factory (consistent) BHSE.

Sure the builders follow circuit diagrams, but the case is be-spoke and other variables may / probably will slant the SQ a bit?

While on that, does the source / actual manufacture of the trans and capacitors remain the same throughout all builds. You
know those 2 elements have a big effect on the SQ as regards component choice and quality.
post #2434 of 4004
Going back to that, if Justin built some KGSSHV I would be on the list!
post #2435 of 4004
Quote:
Originally Posted by dreamwhisper View Post
 

I'm trying to find a comparison between the KGSS-HV and the BHSE and the closest thing I can find i s Asr's old mini-review of the BHSE and a regular KGSS.
 

Has anyone done a comparison of the BHSE with the KGSS-HV?

I have both and the BHSE has more transparent sound.  It also has better clarity & details with larger & deeper soundstage.  The KGSSHV (500 V version) is warmer with slightly punchier sound.  Overall, the BHSE is more refined to my ears but the KGSSHV might be more "fun" sounding to some people.  The DIY T2 actually combine all the good characters of both the  KGSSHV & BHSE with even more textured bass & deeper & wider soundstage.  Note that each KGSSHV may sound slightly difference as this is depending on parts & voltage use. 

post #2436 of 4004

Years ago (and I mean DECADES, sonny....) I had a pair of ESP-9's, an SAE preamp and a Citation XII, AR XA turntable, ADC XLM and a Shure V15-III, Akai open reel, Dynaco FM5. Infinity speakers. QUITE THE SYSTEM for a college kid in 1971. (I had worked in a factory full time while taking 12 hours of physics, chemistry and math at university- don't ask me how I did that. I get tired now just writing it. In fact, I get tired now just THINKING about writing about it.) The speakers were all I could afford- but the headphones were about the best you could get back then.

 

Time goes by....

 

I had a pair of Sennheiser HD-580's.  Decent enough... didn't listen to them much.  Wasn't really into the hifi addiction all that much, had some gear but mostly just listened to what I had, NAD and Boston Acoustics. 

 

Then in 2002 I had a relapse of audiophilia gearitis, and I started building, buying, listening, trying...  Sat down one day and plugged the HD-580's into a Sugden integrated amp's headphone jack, and thought, "Hey these sound pretty good... wonder if a dedicated headphone amp would really sound better..."

 

I became a bit of a headphone nut, kind of, collected a whole bunch of dynamic 'phones & amps, built a bunch of amps, etc and so forth.

 

Added a Stax Lambda Signature and an SRM-T1.  Whoa. What detail! Great LF extension, overall clarity....  and all without the "bleeding ear treble peak" of the otherwise excellent Sennheiser HD-800's. Got a pair of Koss ESP-950's.  Yeah, these are great, too. A pair of 007 Mk I's.... tried an SRM-1 mk II but sold it, no real advantage for me over the SRM-T1, in fact I liked the T1 a little better... sold off almost all my dynamic and planar 'phones, building a T2 for like two years now....

 

Electrostatics are really where it's at.  When new dynamics come on the market, I hardly pay attention.  New planars, yeah, I'll read about them but am not really tempted to buy.  All I feel I need are my electrostatics.  (And the 67,000  FLAC tracks on my server....I have LPs  too but don't use headphones on that system)

 

Electrostatics have a "HEAR-THROUGH" quality  that I just don't get from dynamic or planar phones.

 



 

By the way, none of my electrostatic 'phones have a channel imbalance.  I bought them all used, they have all worked just fine.  I've heard of people having imbalances, but aamong the Koss ESP-950's and five pair of Stax 'phones I've bought used, NONE had channel imbalances.


Edited by milosz - 5/22/14 at 2:04am
post #2437 of 4004
Quote:
Note that each KGSSHV may sound slightly difference as this is depending on parts & voltage use
.

I would times that by quite a bit actually. I have worked with tube amp manufacturers and amplifier kit suppliers for quite a few years
and the end SQ changes quite a bit depending on the specs of the Capacitors (Black Gate were supreme but now not made),. Resistors (Tantalums are good)
Transformers quality (build quality, wide band, noise etc).

Just because the circuit is a certain design doesn't guarantee the exact SQ on offer. Put top parts into it and it will probably go to another level IMHO.
The opposite is also true. So unless a circuit design states exactly the rating and make of a part to use.....
post #2438 of 4004
Quote:
Originally Posted by kothganesh View Post

^. Just to add to my last query, my mood swings are between the Beatles and Led Zep, Pink Floyd to Deep Purple, Boston to Jimi Hendrix etc etc

Difficult to say. Probably depends on how you drive the omega 2. However, I can imagine the 009 getting tiring after a while if that is all you listen to all day and / or at fairly high volume level.
post #2439 of 4004
Quote:
Originally Posted by astrostar59 View Post

. ...and the end SQ changes quite a bit depending on the specs of the Capacitors (Black Gate were supreme but now not made)....

I didn't only read praise about blackgates from diy guys (spritzer comes to mind). Not that I have made the test myself but wasn't this more a case of strong brand image / pretty jacket than actual superior performance for the bloody expensive BG?
post #2440 of 4004
The BlackGates are highly regarded in the amplifier industry as amongst the best. Audio Note UK put them in
there top models and I can say, they do sound amazingly good. Burn in is 400 hours!
post #2441 of 4004

Over the years I've used a lot of Black Gates in DIY tube projects. They were probably the best electrolytic capacitors ever built. That said, the sonic differences between Black Gates and most other electrolytics were small and  incremental, especially considering the large price premium.

Lots of other places (like transformer upgrades) to get more "bang for the buck" when selecting parts for an amp.

 

A dirty little secret well known to DIYers is that all capacitors are sonic killers, and none more so than electrolytics. I don't use any electrolytics in my projects unless there is absolutely no alternative.


Edited by FrankCooter - 5/22/14 at 9:22am
post #2442 of 4004
Quote:
Originally Posted by FrankCooter View Post

Over the years I've used a lot of Black Gates in DIY tube projects. They were probably the best electrolytic capacitors ever built. That said, the sonic differences between Black Gates and most other electrolytics were small and  incremental, especially considering the large price premium.



Lots of other places (like transformer upgrades) to get more "bang for the buck" when selecting parts for an amp.



 



A dirty little secret well known to DIYers is that all capacitors are sonic killers, and none more so than electrolytics. I don't use any electrolytics in my projects unless there is absolutely no alternative.


 



Frank, are they only a problem when in the signal path? So if electrolytics are used in the psu for example, there are no negative effects on the sound?

By the way, haven't heard any of your amps, but your casework is incredible.
post #2443 of 4004
Quote:
Originally Posted by milosz View Post

 

Electrostatics are really where it's at.  When new dynamics come on the market, I hardly pay attention.  New planars, yeah, I'll read about them but am not really tempted to buy.  All I feel I need are my electrostatics.  (And the 67,000  FLAC tracks on my server....I have LPs  too but don't use headphones on that system)

 

Electrostatics have a "HEAR-THROUGH" quality  that I just don't get from dynamic or planar phones.

 

Soooo true. I would never have given such an accurate description of my interest in headphones earspeakers :)

 

Ali 

post #2444 of 4004
Quote:
Originally Posted by FrankCooter View Post
 

Over the years I've used a lot of Black Gates in DIY tube projects. They were probably the best electrolytic capacitors ever built. That said, the sonic differences between Black Gates and most other electrolytics were small and  incremental, especially considering the large price premium.

Lots of other places (like transformer upgrades) to get more "bang for the buck" when selecting parts for an amp.

 

A dirty little secret well known to DIYers is that all capacitors are sonic killers, and none more so than electrolytics. I don't use any electrolytics in my projects unless there is absolutely no alternative.

 

post #2445 of 4004
Quote:
Originally Posted by astrostar59 View Post


.

I would times that by quite a bit actually. I have worked with tube amp manufacturers and amplifier kit suppliers for quite a few years
and the end SQ changes quite a bit depending on the specs of the Capacitors (Black Gate were supreme but now not made),. Resistors (Tantalums are good)
Transformers quality (build quality, wide band, noise etc).

Just because the circuit is a certain design doesn't guarantee the exact SQ on offer. Put top parts into it and it will probably go to another level IMHO.
The opposite is also true. So unless a circuit design states exactly the rating and make of a part to use.....

Certainly can be "quite a bit" but one must remember that most KGSSHVs are very well build using a really good parts already, hence, the difference will be audible but not a night and day.

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