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pham's Achievements


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  1. @spritzer why does Boulder stuff suck may I ask? @johnwmclean good spotting sir This is Carbon is built with max option parts. Those cables that hidden behind them are even more interesting though...
  2. just got benchmarked against a few other little cute friends coming from all around the world...
  3. I built and own a KGSSHV for Stax and do enjoy listening to the Goldmund headphone amp with other dynamic models. The legendary T2's parts sourcing is also in progress during my spare time. Beside these solid state amps, I'm lucky to have a chance to experience other great tube amplifiers including Kondo Audio Note (not the one in the UK). I really wish to somehow send this amp over there to you guys or if I could manage to find time to build a few self-assembly kits... Because in the end of this hobby, it's not the exact specification that counts. Let's just turn on your fav music and chill out.
  4. @spritzer input -> a single VAS -> current buffer stage -> step-up OPT @100VoltTube Every musical instrument or everything that makes sound creates its own signature pattern of harmonics that defines it. The pattern defines the timbre or the “voice” of the sound and tells you that the note you hear. Typically, the patterns people find most appealing and most musical, are even-order harmonics. Tube amplifiers have more distortion than solid-state ones, but most of it is second-order, which is quite musical, natural and pleasant to hear. That's why it's called "harmonic" distortion.
  5. The output stage has indeed enough voltage to drive the 009 as well as other headphone models. Regarding your concern about the NFB loop -- There shouldn't be any problem because headphone impedance is way bigger than Z-out of the custom winding OPT's coil and the other half of feedback loop does have the same signal phase just got inverted. Our design concept is to minimize the number of voltage gain stages usage and try to rely fewer capacitors on the audio signal out path. Usually, other amp tends to have 3 or more stages and twice the amount of output capacitors for each channel comparing to DT-HWT. On the next iteration, we will use only a single voltage gain stage design to achieve the most direct musical sounding out.
  6. since I've mostly listened to the Stax 009 system. It's time to find a new owner that will love this bottlehead crack2 atwoa as much as I do. If you guys are interested in the full upgraded version of crack-atwoa... and also looks sexy like the one above, just PM me Thanks
  7. After rolling in a pair of KT66 vintage Osram and Philips pinched waist ECC82, we had a very pleasant evening with this alternative setup... features: DYN Contour 30 speaker, T+A CDP/DAC/Streamer, DT-HWT acts as pre-amp, Rotel power-amp and a bunch of frey, heimdall, red blue Nordost cables.
  8. Can you guys imagine how sexy the sound would possibly be after rolling those babies in? a pair of vintage Osram KT66... men in black!! It's the beauty of tubes amplifier when you luckily found your gems.
  9. @Rossliew The chassis + electronic parts + OPTs + tubes for this amp run more than 4K and months of craftsmanship to finish it. @mypasswordis I also own the KGSSHV and they do have different flavors in sound signatures. Solid-state I think is not a drop-in replacement for tubes amplifier. @JimL of course, we are not talking about hundreds of times of replacing tubes a day here :_) but tube rolling for experimental results still remains an addicting hobby for many people I guess. I can't help falling to sleep at night! :_(
  10. After a few weeks burn-in period of this little beast, I found it's very relaxing to listen to. I can hear more juices coming out and the STAX 009 just doesn't have that analytical sounding cliché to my ears. It also enhances the soundstage and life-like of Focal Utopia makes it way more enjoyable to hear. This is a push-pull design tube Headphone Amplifier/Preamplifier attempting to achieve the true high-performance of headphones from Dynamic, Planar Magnetic to Electrostatic models. I've gotten a few PM's asking about the schematics and stuff so I decided to open a thread to discuss more here. a few interesting measurements of the amp at R = 6Ω DT-HWT Headphone Amplifier/Preamplifier schematic: DT-HWT Power Supply schematic: ===================== Inputs – it has two sets of RCA inputs. Output – it has different outputs, provided on a number of different connectors. On the amp front is a TRS ¼” unbalanced jack, and balanced headphone outputs on a single 4-pin XLR and a pro bias 5-pin Stax headphone jack. On the amp rear, there are two sets of 3-pin XLR and RCA preamp outputs. Both sets can be used at the same time if desired – for example, you could feed a power amplifier from the XLR connectors, and a subwoofer amp from the RCA connectors. The bias voltage settings on the separate power supply unit are used only with electrostatic ear speakers (> 100K Ω impedance). You can select whichever bias level sounds better to your STAX/HE90 models from 230-500-580 up to 620 V DC bias. Tube complement for the amp unit is: matched pair of EF86/E80F/6D8 & matched pair of 12AU7/5814A/E80CC/E82CC & matched quad of EL95/6AQ5 Tube complement for the power supply unit is: matched pair of KT66/KT77/KT88/6550/6L6/EL34/350B/350A & one 6080/5998/6AS7/6H13C/2399 Look forward to those next iterations/variants from you guys soon... For the meantime, I keep on rolling 11 tubes to find the best combination that suits best for different music genres
  11. We share the same passion here Such a lovely beast for HD650...
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