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Posts by GCooper

The cord frayed at the splitter and I returned them to Koss after registering them on the warranty page. Enclosed a check for $9 US and a brand new pair showed up in the mail in a plain box and a plastic bag about ten days later. These are my "outdoor" headphones--the Martins don't leave the house. The Koss PortaPro are so comfortable that I frequently fall asleep wearing them. Sound quality is good though certainly not up to the level of a Grado or Ultrasone.   They are...
I have spent more than a thousand hours with the same pair of Soviet 6BE6 tubes in my LDIII, , fed by a Turtle Beach DSS2, a Carver TX11a tuner or an IAudio 10. Headphones are my Martin Cocobolo shell Turbulent X cans. The electricity is via a dedicated 15 amp circuit with a Tripplite hospital line conditioner.   Power tubes are Soviet 6N6P mil-spec matched set from the 1970's. These have been in this amp for the past two years.   For Big Band, Swing, Folk, Spoken...
As an amateur radio operator, I have more than a few receivers and most of them can be overloaded by switching power supplies and wireless routers, which generally scream all the way from 10 KHz to 30+ MHz. Computers are a rich source of harmonics, odd and wandering digital noises. In cracking open more than a few computer cases, one can see the places where the various filters would be if the manufacturer had included them.   All of this is perfectly legal under Part 15...
The notes say he used Turbulent X drivers. I have never heard any of the other transducers in the Turbulent line, so I have no way to compare them. Given how many differences there are between the Alessandro MS1 that are my previous cans and the Martin headphones, it is impossible for me to state with any certainty that the drivers are the most relevant change. It could as easily be the cups. What's there from the cable in the audible range (40 Hz to at least 18 KHz) s...
Steve Guttenberg at CNET says the Mad Dogs are excellent with two different tube headphone amplifiers he has tested, so I suspect the LDIII would excel with these cans as well.
Pictures will be posted as soon as they can be shot and gotten back from developing and scanning. I shoot 120 size film (6x6 cm) with my Rolleicords and 4x5 inch sheet film in a Press Camera.
My first purchase was a Koss Portapro for travelling. Grados are not suitable for the Streets of Seattle. Much better build quality and durability than the Skullcandy phones that fell apart after ten months of gentle usage.
The Martin cans arrived late this week! Phenomenal quality construction. The red and black cocobolo chambers are magnificent, as are the bare aluminum mounts and the leather headband. Turbulent X drivers inside. The wiring is basic- black 22 AWG silver plated copper with a Paiiliccs 3.5mm plug.   The bottom line though, is how it all works as a unit. It is beyond anything I could have wished for. Listening fatigue is absent. Sibilance is not relevant-it isn't there....
6BE6 Status Report--   After a few hundred hours of burn-in, my Soviet 6BE6 tubes are running at an average temperature of 135F (after two hours of run time) with an ambient air temperature of 62F. LDIII Case near the front tubes is ~88F. The rear tubes run much hotter-near 280F at top.   Given my tastes in music (vocals, jazz, folk) I am not sure it makes sense to look further. Sound is crisp, good separation, excellent tone, very full but not booming. Probably not a...
archive.org is an excellent starting point for public domain books on electronics, tubes and tube circuitry. Any number of "bundlers" have put together outstanding DVD collections of public domain and long out of print electronics books, and they are on eBay and elsewhere. If you want a detailed list, email me privately.   Personally, I am using the NEETS (Navy Electricity and Electronics Training Series) from 1998 as primary reference and supplementing it out of...
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