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Stax: SR 002 + Srm 002 and Srm 003 mk2 + Srm 003 impression and appreciation thread - Page 19

post #271 of 442

That's what I am afraid of.

Justin mentioned somewhere in the first few posts that it could be done. I wonder if he knows which connector to use........


Edited by gilency - 2/26/13 at 8:41pm
post #272 of 442

Yeah it sucks...but you still need to buy the detachable ends that connect up to the ear-speakers itself if you're wanting to make a cable. Besides dicing a broken cable I see no other approaches to making a custom cable.

 

Btw congratz on 2000 posts.

post #273 of 442

Oh, is not a custom cable I'd like to make. It's an adapter to use the sr002 with a regular Stax amp. 

I rather test the KGSSHV I'm building with the 002 than the Sigma404 or the 009. 

Funny, did not even noticed I was up to 2K 


Edited by gilency - 2/26/13 at 8:39pm
post #274 of 442

^^ Dat. Pigtail with portable jack on one end and Stax male on the other. 

 

From modifying a SRD-7 Pro to a 727II, I was glad to have the 003 volunteer to have the first listen (and such a great little product to boot).

post #275 of 442
Quote:
Originally Posted by gilency View Post

Oh, is not a custom cable I'd like to make. It's an adapter to use the sr002 with a regular Stax amp. 

I rather test the KGSSHV I'm building with the 002 than the Sigma404 or the 009. 

Funny, did not even noticed I was up to 2K 

 

making a jack like the one on the sr-002 amp is a lot easier than making the headphone plug.  it's just piece of circuit board

HeadAmp Audio Electronics - home of the Pico and Gilmore amps.  Now with Audeze, Fostex, HiFiMAN, Sennheiser, and STAX.
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post #276 of 442
Thread Starter 

My new external battery about 4,5 volt .

my friend DIY help me to build this external battery for my Stax Srm 002

with the this external battery can improve the sound quality very good 

high : more open than use 1,5 volt x 2 battery and more detail 

mid : more body , more sweet and more clear 

bass : better bass impact than use 1,5 volt x 2 battery 

separation : is better than before 

soundstage : wider and better depth

 

maybe Justin can help another head fier Friends to build external battery like mine

 

post #277 of 442
Quote:
Originally Posted by rudi0504 View Post

My new external battery about 4,5 volt .

 

 

 

Your external pack looks promising; thanks for posting. If you can share more specific information about the cell used, the pcb (schematic and parts list), and the connections, others looking for a similar solution might choose to build one. 
 
Was that PCB repurposed from another application? A protection and charging circuit? And, have you given any thought on how you'll case it up?
 
I'm still thinking the ultimate solution would be an internal (max-voltage-possible) cell with a charging/protection circuit that can be used on the go, or, plugged in while stationary; charging the battery or trickle-charging while the external source is used to drive the amp. 
 
I'm sure Justin would love to help between building BHSEs (batch 3&4) and many other fine products and shipping Stax gear the same day purchased. Hopefully someone knows a guy that knows a guy that can also assist.
 
Your posts and impressions on the SRS-002 helped me pull the trigger; mine should arrive today. Thanks a bunch for sharing with the community.
post #278 of 442

I just bought a Sony AC-E454 4.5 VOLT 400ma AC POWER ADAPTER, but my DMM reads the DC voltage at 7.9V when it should be 4.5V.

Should I be concerned about using it with my SRM002? 

Somebody posted earlier about using this particular adapter. Just want to express concern that it could potentially damage your amp.

I bought this one at ebay and likely will return it.

 

Processed By eBay with ImageMagick, R1.1.1.||B2||T0JKX0lEPTVjYTFhYjFlYTU1YTAyMjUwNTExZjdjMWJjN2Y3NjA1MTI2OGQ0NWVhYzg1fHxTRUxMRVJfTkFNRT10bmNzZGVhbHN8fE9SSUdJTkFMX0VCQVlfUVVBTElUWV9TQ09SRT00fHxDUkVBVElPTl9EQVRFPTIvMjIvMTMgNzo0MyBBTQ==


Edited by gilency - 2/28/13 at 8:41pm
post #279 of 442

If you trust your DMM, I wouldn't use that power adapter for anything. If it reads 7.9V it's broken, who knows what it will output when the amp is plugged in. 


Edited by oogabooga - 2/28/13 at 9:14pm
post #280 of 442

Yeah, I trust my Fluke. That's what I get for buying used stuff in ebay....

post #281 of 442

Yep, I wouldn't be surprised to see a slightly elevated voltage when the power supply is unloaded, nearly double is very high.

post #282 of 442
Thread Starter 
Quote:
Originally Posted by drp View Post

 

 

Your external pack looks promising; thanks for posting. If you can share more specific information about the cell used, the pcb (schematic and parts list), and the connections, others looking for a similar solution might choose to build one. 
 
Was that PCB repurposed from another application? A protection and charging circuit? And, have you given any thought on how you'll case it up?
 
I'm still thinking the ultimate solution would be an internal (max-voltage-possible) cell with a charging/protection circuit that can be used on the go, or, plugged in while stationary; charging the battery or trickle-charging while the external source is used to drive the amp. 
 
I'm sure Justin would love to help between building BHSEs (batch 3&4) and many other fine products and shipping Stax gear the same day purchased. Hopefully someone knows a guy that knows a guy that can also assist.
 
Your posts and impressions on the SRS-002 helped me pull the trigger; mine should arrive today. Thanks a bunch for sharing with the community.

Hi drp 

 

i am sorry , I bought from my friend DIY , I know only That he use Samsung Galaxy S3 battery . I don't know about the pcb board for the charger .

 

that's why for head fier friends who live in USA or other country , maybe Justin from Headamp know about this external battery .

its very good if Justine can sell so kind of external battery for us .

this battery can improve SQ significant , more power , better bass impact , better clarity 

better separation and soundstage .

 

i have 3 benefits from this external battery :

1. I can safe money to buy 1,5 volt battery 

2. I worry about the battery cover from my Srm 002 , that's one day can broken , because 

    Open and close ( the material from plastic )

3. I can improve my SQ from Srm 002

post #283 of 442

^^ Cheers, Rudi.

 

 

Switching back to topic of cable swapping, has anyone actually disassembled a SR-003 housing, or have specific instructions on how this should be done? Appears to be press-fit together; trick being where exactly to pry first, and how/with what type of tool. Are the cable contacts just plugged in or soldered on?
 
RE: Swap out the cables with my current 003; see how the Mk2 version sounds with the 252 and 727 amps. At the moment, using a 4.5v universal wall wart to power and sourced with a RA Opus 21; color me very impressed with this little transportable.
post #284 of 442

Thanks for the photos.  

 

The amp section looks not that different from the 001 amp's, what kind of opamp are they using (two 8-pin SOIC close to the input jack)?

 

The power supply section looks similar as well, maybe more robust, using two power transistor (instead of 1 in the 001).

 

The output board seems to have A LOT of extra "wasted" space, begging for output cap upgrades.

 

Quote:
Originally Posted by justin w. View Post

Here is the inside of the portable amp, for those who are interested in this stuff.  Could probably double the battery life, and lower the weight, by replacing the 2xAA holder with a lithium polymer pack.

 

 

 

 

 

post #285 of 442
Quote:
Originally Posted by drp View Post

 

 

 

Switching back to topic of cable swapping, has anyone actually disassembled a SR-003 housing, or have specific instructions on how this should be done? Appears to be press-fit together; trick being where exactly to pry first, and how/with what type of tool. Are the cable contacts just plugged in or soldered on?
 
 

 

You don't need to take any cases apart.  The cables just plug into the ear pieces.  No tools needed.

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