[justin w.]

I dont know if Stax gives a maximum but maybe there is a reason they specify a 4.5V DC adapter instead of one that is much more common today, the 5V.
 
it's a waste too because that battery pack contains a step-up converter to increase the voltage to 5V which lowers efficiency and we dont need it
 
i'd also be curious about the interaction between a switching power supply that might be poorly filtered (like the step-up converter on the battery pack) and the step-up converter inside the Stax amp
 
i took a look and i think the largest li-po battery I could fit in place of the 2xAA would be about 3,000mah @ 3.7v.  if the largest nimh AA batteries are around 2600mah @ 2.4v, this is around a 75% increase in battery capacity.  The DC Adapter jack could be re-wired to accept a li-po charger instead.

 

[MexicanDragon]

Quote:

I dont know if Stax gives a maximum but maybe there is a reason they specify a 4.5V DC adapter instead of one that is much more common today, the 5V.
 
it's a waste too because that battery pack contains a step-up converter to increase the voltage to 5V which lowers efficiency and we dont need it
 
i'd also be curious about the interaction between a switching power supply that might be poorly filtered (like the step-up converter on the battery pack) and the step-up converter inside the Stax amp
 
i took a look and i think the largest li-po battery I could fit in place of the 2xAA would be about 3,000mah @ 3.7v.  if the largest nimh AA batteries are around 2600mah @ 2.4v, this is around a 75% increase in battery capacity.  The DC Adapter jack could be re-wired to accept a li-po charger instead.

This sounds pretty great, Justin.

**BRENT**

 

[gilency]

Quote:

 
I bought one of these and tried it out - after an hour of listening I noticed that the SR-001 amplifier's plastic housing was warm to the touch. I'm wondering if 5 volts might be too much for a stock SR-001 amp. Anyone with any thoughts on this?

Did it make any noise when listening? Mine did.

 

[drp]

Quote:

The DC Adapter jack could be re-wired to accept a li-po charger instead.

Switching from a battery bypass connection to an active on-board battery charger would be too slick. Be even slicker if said charger also allowed use of the amp while charging.
Quote:

Did it make any noise when listening? Mine did.

I bought one as well and had it connected for less than 20 seconds due to the noise.  I needed a USB charger anyway for when I'm off the grid; works perfectly for this.

 

[DefQon]

Quote:

 
I bought one of these and tried it out - after an hour of listening I noticed that the SR-001 amplifier's plastic housing was warm to the touch. I'm wondering if 5 volts might be too much for a stock SR-001 amp. Anyone with any thoughts on this?

I did this for about an hour till my SRM-001 unit got too warm. Strictly speaking you would get the PSU rated at 5v but it actually will be fluctuating a bit higher maybe around 5.10v etc. Underpowering something is fine but overpowering over the 10% tolerance is not usually good especially with something this small and delicate. Purchased a DC adapter today with interchangeable tips and adjustable voltages. I cannot hear any sound improvements over battery but at least I have it good for desktop use now till I can be bothered with buying the Pro-bias adaptor cables through my Stax distributor (thanks to rudi and his friend).

 

[Gilles De Rais]

In terms of powerpaks, I've been using a Sony Ac-es455k to run my Sr001 as a desktop - 4.5v 500ma  (I am in a 240v country). Polarity of the tip is correct and works well with nothing getting overheated. Can still pick these up for cheap on ebay and other places Rest of the system is a HRT istreamer/ipod.
 
regards,
 
Giles

 

[gilency]

Yeah, bought one from eBay, V was around 8V when it should have been 4.5. 
Just make sure to measure it before you use it

 

[oogabooga]

FWIW when I called Yama's the other day, they told me they sell a wall adapter for the SR-002 for $40.

 

[gilency]

Thanks for the info. I emailed but have not received a response yet.
this one from Amazon looks OK:
http://www.amazon.com/Velleman-Compact-Universal-Adapter-Supply/dp/B00068U44I

 

[DefQon]

$40 seems a bit too much for an adaptor. I got mine from Jaycar for $25 I know it's bit more expensive than ebay but should anything go wrong a 10 minute train ride or 15 minute drive and I could get it replaced instantly. My one is 1.5ma.

 

[Steven Stone1]

Quote:

Did it make any noise when listening? Mine did.

No noise, but too much heat for me to feel comfortable using it. Too bad, it made a cool traveling rig - the AK 100 the SR-001 and that battery pack...

 

[gilency]

Stax is out of stock for their power adapters. Quoted price is 45.00 by StaxUSA. Expensive.
Ordered the Velleman.

 

[pchong]

Havent posted in a while...blissfully enjoying my SRM001-2 till recently when the cable from the little amp to earbuds went wonky...intermittent contact...anyone know how/where to get a replacement? Thanks...email chongp at gmail please.

 

[gilency]

Depending on where you live, the stax dealer. Staxusa.com in the US

 

[DefQon]

^^ What Gillency said, in my case through my Stax distributor in Australia, just to give you a rough price, the cables for the SRM units are tad bit more expensive than the desktop Pro-Bias cable @ $90 not including postage. So expect to pay $65-90 with StaxUSA or Yama/Audiocubes.