does any body know these Stax amps?

[moray james]

Wanting to know the differences between the SRM-252 Mk2, the SRM-252A and the SRM-001. Do all three uses the same amplifier circuit? I Know that the SRM-001 uses a switching supply that I assume that the table top models do not but are the circuits the same?

[Salt Peanuts]

SRM-252 Mk2 and SRM-252A are same amps, just a different naming for different market. SRM-001 is their portable amp. I don't know how the circuit design on SRM-001 and SRM-252 Mk2/A differs, but I'm sure resident Stax experts here can comment on that.

[spritzer]

The SRM-252 is the last in line of amps ranging back to the to the early 90's SRM-X so the SRM-001 could have been built on one of the predecessors.

[kevin gilmore]

Not even close to the same. srm-001 is a capacitively coupled output single

high voltage design with an opamp front end.

The others are basically portable versions of the dc coupled srm-313 and

run at lower voltages and lower currents.

All 3 use a switching power supply. The sr-001 makes +600, +12 and -12

The other 2 make + and - 300

[moray james]

Thanks guys I appreciate the information. Have any of you compared the sound of the SRM-001 to either of these small amps? The 001 looks like a good little amp for the money. You cant build an amp like this for the kind of money you can buy one for. Thanks for the circuit info Kevin. Have the 313 & 001 schematic so that pretty much covers these then (thanks to you). Regards Moray James.

[MaloS]

From my experience, 252a is better than 001, but there are DIY modifications that can be done to 001, that supposedly put it on par with 313. (The headphone I use with either amp is 001/003, which is same driver, but different plug basically).