ericj

Necrobump! Was there ever an official published schematic for one of the SB transformer boxes? And if so can i have it? About the zener. There is some confusion to be sure. In the SRD-7 schematics, the part is listed as Z1100 and the symbol is very clearly a bidirectional zener, what would be commonly sold as a transient voltage suppressor today. There appear to have been parts called "Z1100" from a few companies and some of them were unidirectional. The component on the boards in my two SRD-7s has no stripe at all, just an "A" logo and Z1100. One end is slightly pointy but that is probably just sloppy epoxy work. Semitec made a Z1100 TVS diode until 2005. See attached datasheet. Littlefuse makes a P6KE100CA with similar specs. Given the nature of the SB energizers it may be that a unidirectional part works better in that circuit. Which is sort of why i would like to know if there was a published schematic. I don't have any SB energizers myself. SMTCD00017-27.pdf

Slight necrobump! ZL01-ZL04 are not zeners. They're MOVs. Fujitsu ENB461M-03. CASEC_ENBXXXM_03A.PDF

i believe so

a few points of data: When i got my esp/950, it had a squeal in both drivers when driven by either the e/90 or my srd-7. at the time i had no pro-bias sources. Koss insisted on getting their hands on the e/90 as well when i sent it in for repairs. When i got them back, the work order said they'd replaced both 'elements' and the cable, and 'adjusted' the e/90. They no longer squeal. I haven't tried them on a low bias again, but they work fine with the 580v bias on my eXStatA amps, which are variable, but i haven't bothered to vary 'em.

There are posts in the head-fi ortho thread that have been edited dozens of times over the last few years. Just replying to them with a correction helps only the people who constantly follow that thread, because the corrected info is a hundred or more pages back.

Hey, so did you. This is neat.

The way i function in this hobby is mainly exploratory and investigative. Occasionally i realize that i've posted something that later turned out not to be entirely true. Sometimes i find out i was barking up the wrong tree, or i misinterpreted something somebody else told me, or I'm just plain mistaken. At the other fora, I can just go back and edit. Even if i could only append to the same post, that would be ok with me. Not being able to make a change after a short window makes me wary of discussing theory or discovery here. So i won't.

Hey, you know, if head-case doesn't value my contribution, i won't make it. I can't fathom the rationale for the policy, and it inconveniences me. And i have other options.

It will seriously limit my inclination to post here.

fwiw i was here almost a year ago, but left when i discovered the old software wouldn't allow me to edit posts. srsly.

dt250-80?

I know a guy who knows a guy who can sell you a NOS pair for something like $80. I paid about $21 shipped from austria for my pair. Thing is, stockers, they come with a plastic grille over the driver module and pleather donut earpads. My pair lacks the grille and has a thin foam donut covered with a lycra bonnet. The lycra bonnet might be a sennheiser part, dunno where the foam came from - could cut your own. They are not for bassheads, though.

It aint a bad headphone, but some of the weird resonances in it bug me as compared to headphones that are wholly dynamic or wholly planar. Too many compromises in the design. I still say that the K145, which i forgot to put on that list, is better. 'course, I've also come to understand that my K145 was modded by a previous owner.

Really? Bummer.

OK, lemme give this a shot. Top - These are the headphones that right now i can remember really thoroughly enjoying with few to no disappointments: ECR-500 DT880-S (Edition 1980) DT990 (Edition 1990) K240-DF K240-Sextett MP Yamakoax (ortho transplant of my own construction) Almost Top - Still excellent, nothin wrong with them, magic less than complete. Deserve to be in the "top" list except for my own neurotic issues: T40 v1 T20 v1 T50 v2 YH-100 QP85 SR-X III Pro 30 K240-M (early) DT770 Pro/80 Middle - Still real good. Many enjoyable hours: SR-80 Pro (Stax) SR-30 DT250-80 K340 (bass-lite) (That's right, you heard me. MIDDLIN.) HOK 80-2 Fair - no complaints: K260 Pro HD25-SP QP55x Meh - meh: Pro4AAT ATH-A900 This list will probably get edited as i change my mind, remember headphones that aren't mentioned here, etc.