Please, no need to be so formal, call me Dick. 

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Just joined Team Stax/STAX. After a week with a SRM-1/MkII - Lambda Pro combo I've already ordered it and two other phones. In all the years I've been in this hobby my electrostatic time has been very limited and I don't want to sound like a zealot now with it being so fresh. I will say hearing the Lambdas took me back to my early steps of this hobby - my first Grado and my first good Ety seal (what years ago used to be called "The poor mans STAX"). They felt like gigantic jumps in SQ. Since then gear choices have been usually based on practical considerations or more minor performance gains - better separation here, tighter bass, less grainy vocals, etc. The Lambdas made me giddy all over again. It's been a long time since I scrambled to hear old music again.
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| I recently got another pair of Stax lambda headphones, that will find their home with FV. I gave them a thorough listen and look over before putting them in a box while they wait for their new owner. I was surpriced, well not really surpriced, how almost identically they sound to my pair. This consistency is a great thing |
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Was the second pair the same type Lambda's?
I use to own two pairs of SR-303 headphones and I made the same observation; They almost sounded the same. (although there was a few years and many hours of listening between the two pairs). Maybe they only loosened up a tiny bit during the years. |

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I recently got another pair of Stax lambda headphones, that will find their home with FV. I gave them a thorough listen and look over before putting them in a box while they wait for their new owner. I was surpriced, well not really surpriced, how almost identically they sound to my pair. This consistency is a great thing.
Unlike K340 that all sound different Lambdas seem to sound exactly the same. The pads on these are a bit stiffer than on my pair and I attribute barely audible difference to the fit. When this tells me that the differences that people hear in Lambda sound should be attributed to their preferences and not to the manufacturing inconsistencies. They guys with lots of Lambda phones should correct me if I am wrong in any way here. |
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I recently got another pair of Stax lambda headphones, that will find their home with FV. I gave them a thorough listen and look over before putting them in a box while they wait for their new owner. I was surpriced, well not really surpriced, how almost identically they sound to my pair. This consistency is a great thing.
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There's a mystery electrostat on SF Craigslist!
I know some of you have experience with Suprex 'phones, but I haven't been able to find any info on the PEP-81. |
I've been trying to remember/date the PEP-81 myself, and though I don't remember it, I did see test reports indexed by the Boston Audio Society that were dated late 1979. So it was a late model, probably very near the demise of Superex itself. What it looked like... ..?? My guess is that it looked like the PEP-74 [EDIT: It did. Popular Mechanics did a quickie test of several advanced 'phones, including the Infinity ES-1, the Burwen/Peerless PMB-8 and the AKG K340 in its Nov 1980 issue.]
See if you can get the seller to send us a photo.