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Showing content with the highest reputation on 04/24/2017 in all areas

  1. Finally the holy triple with the frontplate of the carbon
    6 points
  2. That would be the next step, so yes, but only after the chassis part is set in motion. Regarding the chassis, I met with my shop guy today (I love the small shops, most wont give me the time of day) to go over final costs for the chassis sets. I was able to get nearly the same pricing as two years ago so that is a plus. The first group buy was $1525 for the 2-box chassis set, and this one will be $1550. Time frame should be under 2 months ( will depend mainly on the extruders. Those who already expressed interest, I will be contacting you in the next day or so to arrange a down payment. Anyone else interested, please let me know by the end of the week. To recap, the cost will be $1550 for the complete chassis set anodized black with laser etching (there are some pictures in this thread from the earlier group buy), which includes mounting brackets. This does not include jacks, boards, screws, volume knob or feet. I can have some matching aluminum cone feet made (waiting on pricing) and they can do a matching volume knob for $30 with the shaft that extends about 2 inches into the chassis. For those joining the group buy, I will need a $200 deposit, then balance plus shipping due when I have everything ready to ship.
    4 points
  3. Here's something that has been cooking for a while... what happens when you take some heavily tweaked SR-X Mk3 normal bias drivers, an old SR-303 cable, some earpads from Belarus and a cheap Beyer clone from China? Something that is actually pretty decent... Now the drivers are actually Pro bias if that wasn't clear but this one fun sounding set of headphones. Off the Carbon CC it has that lovely tuneful bass the SR-X Mk3 Pro has but this one has far more body to it. The voices are sublime and have that SR-X quality to them without the over damped nature of the originals. The highs a tad too lively but that will be tweaked in version 2.0. Over all...I'm a happy bunny for spending next to nothing one these... It's fun to play with this stuff and see what comes of it.
    4 points
  4. here are 3 current sources at 10khz currentsource.PDF
    3 points
  5. record store day! Clear vinyl, the sound quality is remarkable (Kevin Gray all analog chain mastering)
    3 points
  6. 2 points
  7. I'm not sure that is the case. On the Gary Pimm website (which seems to have disappeared), he gave measurements of cascoded FET CCS which showed performance flat over and above the audio range - in fact, as good as a very high impedance resistor. Same for Walt Jung's articles, which showed very high, flat impedance to well above 20 kHz. And that makes sense, because although the disadvantage of MOSFETs is high capacitance, in the cascode CCS the "lower" MOSFET sets the current, and the "upper" MOSFET largely shields the lower MOSFET from voltage variations, so that it sees a nearly constant voltage over a large voltage swing, and therefore produces a constant current regardless of voltage swings, which translates to a high and consistent impedance even to very high frequencies, equivalent to a very low capacitance.
    2 points
  8. Playing a drop of the music matters 45 rpm - love this album
    2 points
  9. I got music!!! Thank you Kevin, Soren, Joe (beautiful chassis) and all that helped me!! running at 18mA.
    2 points
  10. I can't decide if I'd rather see Nashville or Edmonton in finals... I can't root for St Louis (on principal as a hawks fan) and I fucking HATE the current Ducks core ever since their 2015 conference finals. Cory Perry is truly a unique piece of shit and I would love Nashville to tune him up nice and good over the next few weeks. Preds vs Caps sounds fun as hell.
    1 point
  11. Uh oh, I see GeorgeP is crazy enough to want to set up another T2 run... are there going to be some CCS modifications to the board?
    1 point
  12. I'm glad that series is over, I hope it was enough to convince them to do what it takes in the next round.
    1 point
  13. Best series of round 1 finished. Toronto is going to be the bane of many folks for years to come... But for now, Washington - you have one job to do. End the curse, beat the goddamn Pens once and for all. I'm fully Caps bandwagon round 2.
    1 point
  14. Steve is moving to Iceland???
    1 point
  15. Thanks! And happily reporting that there is no "hum", not even a fainted bit . Excellent transformers, thanks again Joe and Ang! it had been running for 3 hours now, and temp is steady at 39 C on the chassis.
    1 point
  16. Push'em harder! 20mA at least
    1 point
  17. Marched for science with the wife and daughter, friend, and fellow geeks. Funniest moment was running into my daughter's 5th grade teacher last year with her partner who was carrying a sign with the following elements and words: Flourine Uranium Carbon Potassium Trump/Spence
    1 point
  18. Bolton's Spicy Chicken and Fish. Mild/Medium/Hot A celebrity got the Whiting in Medium Skinny Michael Moore is a Montgomery Biscuits Fan **BRENT**
    1 point
  19. If memory serves, at Nate's you can interact with bats.
    1 point
  20. I organized a DIY T2 chassis group buy a couple years ago, and I've had a couple people inquiring as to whether I could do another. So putting this out there to see whether there is sufficient interest in doing it again. I would need at least 5-6 participants for it to be viable. Last time the cost of the chassis was $1500 ish, with anodizing, holes tapped, brackets are laser etched faceplates. Before I place any order, in the event there are enough participants, I would need a $200 up front commitment as the machine shop needs 50% at commencement and 50% on completion and I can't have people changing their minds later on. So reply here or PM me.
    1 point
  21. I concur. My thoughts after checking out the data sheet: General specs It's a directly heated "tube" and at 0.7V filament voltage requires DC heaters. The given transconductance figure must be microhmos because the plate resistance is listed as 330k (though Mu = Gm x Rp and it doesn't quite work out). Charts There are two I/V plate charts: one at low voltage with positive grid bias and another with a larger voltage scale. With the 1.7mW plate dissipation, this is definitely designed for a positive grid. The curves below the dissipation max at higher voltage (where the grid could be biased negative) are kind of ugly. The curves look most interesting on the large scale chart in the 20-60V range, but the 0V grid line is smack in the middle of it. Apps This all makes sense given that it is direct heated and will likely be paired with other solid state parts and low voltage regulators. The app notes have a clever bias scheme for a 3.3V supply (note this will only work with positive grid bias). The 'Basic Circuit' shows source followers on both the input and output to deal with the impedance issues of the positive grid and large plate resistance. Frequency Response and THD Frequency response looks good at the voltage supply levels provided (5, 12, 30) with a -10dBu input (about 0.25Vrms). THD+N is not so good at the 5V supply level, but it is not bad at the -10dBu input and below with 12V or 30V supplies. Looks like it's meant to be driven with fairly modest input signals (ie portable devices). There's no indication of the harmonic make-up of the THD on the datasheet. Conclusion This is all about knowing the limitations of the device and what the trade-offs gain you. This "tube" is an interesting hybrid in terms of specs and it definitely was designed to be partnered with solid state. I associate Korg more with MI than CE and so I was expecting something destined for guitar preamps and pedals (and this might work fine for that given there are two triodes in an "envelope"). However, it also appears to be an interesting candidate for a gain stage in portable headphone amplifiers, given the low supply voltage requirement and the low output voltage limitations of many phones and DAPs. I don't get the desktop format in this particular amp other than that it makes for a fairly unique and interesting device. If portability isn't a concern, there are better "tubes" to use. On the other hand, the Nu Tube device itself may allow the manufacturer to keep some production costs down in comparison to traditional tube amps (all on a PCB, no high voltage or output transformers, consistency from device to device). Whether it's better than a JFET in the same application would be interesting to hear. In all cases, this guy needs assistance from ancillary solid state devices. Ain't nothing wrong with that, but given this requirement it's almost more of a Nu Transistor than a Nu Tube.
    1 point
  22. I still keep the slide rule, the HP11C and two posterior models but unfortunately I don't keep the HP35, the first HP that I had.
    1 point
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