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For anyone with a set of ESPs, you may want to open the box and check the screws holding transformer and choke as well as others.
Recently I had noticed a hum in my 9bs and it was increasing. Today I opened the box for the first time ever and as I touched around, I found the transformer was a might shakey so I tightened all the screws in the box. Everyone of them was loose. I snugged them but did not muscle them to avoid cracking the pcb. The hum is now gone. Not sure if they were assembled loose and over time loosened up or were and just loosened over the years.
Don Brian Levy, J.D.
Toronto ON Canada
Follow Ups:
WOW that dates you ! (and me too as I have a pair of ESP 6's)
Dates me? Heck when I got my ESP6 system when it first came out, I was already a veteran in the audio industry. Well before them I had bought a newly introduced K-6 set. My current set of 9bs are interesting in that they were made by Koss in '89, years after being discontinued
Don Brian Levy, J.D.
Toronto ON Canada
Back when I had a pair of ESP7. Now using the ignored/underrated ESP/950 and loving it!
Edits: 09/25/14
I can not quite get my head around the 950. Seems almost a forgotten orphans from Koss. Developed and marketed as it only to keep up the appearance but not really dedicated to being in that market by producing the best they can. It is good the 950 survives and if I did not have the 9s I would look at it but the build and box seem so very cost constrained while it does not show in the pricing. I might feel better if they modded the Pro4 to be a little less tight and to hold the 950, I.E. more like the earlier models. Then the perceived value would increase, at least. I have not heard the 950 but from the reading it does seem I likely would prefer its sound to say, the Stax.
Don Brian Levy, J.D.
Toronto ON Canada
I have been researching the web about the 950s. It appears the elements are not based on the JansZen design used in the older models. As a long term owner of multiple sets of KLH Nines and numerous JansZens including a set of Z412HPs that I still have, the older Koss phones are to my ears almost the perfect listening experience though they may no longer need considered the most accurate reproducer. No one around here has the 950 in stock to listen to.
Luckily my 9s are almost new having been made in, ate '89 to early '90 so, am not quite at a point where they have to be replaced. I am thinking about a set of 10s, maybe as they seem plentiful, as a backup system. I have never found the Stax involving and Sennheisers I have had and they were so poor in material and construction that within a couple of years they literally fell apart. In viewing the guts, it looked like a poorly made diy project.
Don Brian Levy, J.D.
Toronto ON Canada
On another site someone published a 1974 Olson catalog. It shows the original 9 ago a price of $150. I remember the 9b costing a might more but considering the going prices of the current Koss e'stat, even with inflation the 9 was a bargain. Another 3-7 x the price of a set of Pro4s. I contrast today, the ESP for a multiple of about 9x the current Pro4 international.
There may be better out there today than the 9be but, I will run with them until they literally fall apart and return to dust.
Don Brian Levy, J.D.
Toronto ON Canada
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