STAX DA-100M class A monoblocks - Worth buying?

[Groundloops]

I'm having the opportunity of buying a pair of these early 80's class A monoblocks. Can someone give me advise to buy them or not, I've searched a lot all over the web but did not find enough information to get a clear picture. 😕 The price tag is €500,00 btw. ...

An externally hosted image should be here but it was not working when we last tested it.

Stax DA-100 M, Class-A Monaural Power Amplifiers
Specifications:
Manufacturer: Stax LTD, Japan
Input: 1400 mV (1000 ohms)
Rated power: 100 watts into 8 ohms
THD (1 kHz): 0.008 at 8 ohms
Frequency response: 0 Hz to 500 kHz + 0/-3 dB
Outputs: Speakers: 1 x screw/clips/banana
Power supply: AC 100V, 117V, 220V, 240V
Protection circuits: Thermal: triple protection
Dimensions: 200 x 268 x 433 mm
Weight per piece: 15 kg

"Special features: Class-A power amplifiers with "Super-Shunt" power supply. The full power is in the A-operation reachable. By heat pipe fall ventilators away, the damping factor is greater than 500. High-end monos with advanced sound, stable for all speakers, including electrostatic.

Test in "Stereoplay" 10/1981: Absolute top-class (Reference!)
Selling Price in Germany (pair): 9000,- DM"

Schematic: http://www.amplimos.it/images/engine_stax_da-100m_schematic.pdf

 

[rayma]

I'm having the opportunity of buying a pair of these early 80's class A monoblocks.

Make sure the heat pipes are not leaking. If amps operate normally, that's a pretty good price.

 

[Groundloops]

Valuable hint ... Thank you!