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Stax stax ESL-F81 - please help

I am trying to figure out what amps would drive F81 best. I have a Class A 20W custom made ECC88/MOSFET Amp that works great with high sensitivity speakers but fails badly with Stax, McCormack DNA-1 Deluxe that drives Stax fine but is not as fluid as Aleph 3, Pass Aleph 3 works fine but clips at higher SPL and Symphonic Line RG11 that works nicely but does not bring anything special to the table. These are very demanding speakers.

Frequency Characteristics: 40Hz ~ 20KHz (-10dB)
Impedance: 4Ω or full band
Sound pressure level: 73dB (equivalent 8Ω 1W/1m)
Maximum input instantaneous: 300W (equivalent 8Ω)

With impedance all over the place from 2 to 32 depending on the frequency. Any suggestion for under 2K tube or sand amp?
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faust3d OP
10 posts
 
Hey thanks for all the info. How do I get to the fuse and RC network resistor? Do I need to take off the top plate of the box? I cleaned the beck from the deteriorated foam and never replaced it. Do they sound best with or without this foam?

I listen only near-field and at low volumes, they are my late night speakers, so I am looking for something to drive them to SPL 90 or so, but with warmth and clarity.
faust3d's avatar
faust3d OP
10 posts
 
If I decide to go with OTL tube amp what should be ideal specs? Any amp suggestions? I just want to see what the market is.
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