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- Users: mideel
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ABX Reliability
Quote: There I fixed that for you! I also made you a new avatar: Quote: I don't agree on your notion that "measurements don't tell the whole story", if something is not measurable then how does that differ from something that is nonexistent? And please define what you mean by...- mideel
- Post #5
- Forum: Sound Science
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Cavalli EHHA Embedded Hybrid Headphone Amp
Quote: Originally Posted by dBel84 for what it's worth, mine was a great morning coffee warmer. This is what class A is all about imho ..dB Quote: Originally Posted by sachu hehe..most definitely..running the amp boards at 200mA was good enough for me to never turn on the...- mideel
- Post #1,466
- Forum: DIY (Do-It-Yourself) Discussions
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Cavalli EHHA Embedded Hybrid Headphone Amp
I really appreciate the help sachu, the heat sinks are ~65C. I know that these devices are designed to withstand temps even up to 175C, but I just don't feel comfortable letting these run that hot if I can help it. I'm going to try and fit some better off board cooling.- mideel
- Post #1,461
- Forum: DIY (Do-It-Yourself) Discussions
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Cavalli EHHA Embedded Hybrid Headphone Amp
Quote: Originally Posted by sachu YOu probably have the bias point turned up waay too high. A mistkae i made too when i got my first EHHA going..had the mosfets burning nearly 450mA. Fortunately i had offboard heatsinks. So assuming the output is towards you and the tube is on the...- mideel
- Post #1,459
- Forum: DIY (Do-It-Yourself) Discussions
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Cavalli EHHA Embedded Hybrid Headphone Amp
After spending 2 hours troubleshooting (under rated fuse ) I finally got my first EHHA board tested and it measures OK! R3 1.513V, R4 1.475V (1.5V) R10 1.494V, R14 1.444V (1.5V) R15 0.888V, R17 0.795V (0.85V) R16 0.564V, R18 0.674V, R26 0.535V, R29 0.644V (0.65V) DC voltage at the output...- mideel
- Post #1,457
- Forum: DIY (Do-It-Yourself) Discussions
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Cavalli EHHA Embedded Hybrid Headphone Amp
Just a small update on my EHHA progress, I got my o22 power supply assembled and tested with two 2x15V 25VA transformers (my 100VA transformer might be weeks away from arriving because of the ban on air flight over Europe). After trying several 12V zeners I got the o22 measuring at 29.2V, I...- mideel
- Post #1,449
- Forum: DIY (Do-It-Yourself) Discussions
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We Got Ti Kan (AMB) an HD800!
Shameless bump from the dead, but I need to really say thank you Ti Kan (headwize, head-fi and the DIY audio community in general included). I just finished building my first DIY amp, CK2III. The documentation from AMB labs was impeccable, the posts here and on headwize were really helpful in...- mideel
- Post #505
- Forum: DIY (Do-It-Yourself) Discussions
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Cavalli EHHA Embedded Hybrid Headphone Amp
25VA with 2x15V in parallel, each 6GM8 draws 330mA (6.3V). Two tubes in series will draw 330mA (12.6V), so 4 tubes will draw 660mA (12.6V). The transformer is rated at 25VA/15V=1.66A. The 6H30 tube is rated: Voltage: 6.3V Current: 0.825 A, so I wont be able to use 6H30 with this transformer...- mideel
- Post #1,444
- Forum: DIY (Do-It-Yourself) Discussions
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Cavalli EHHA Embedded Hybrid Headphone Amp
I recently bought MrMajestic2 balanced EHHA kit and my build is going along nicely: The build includes o22 PSU with 100VA 2x30V Trafo, 12.6V o11 heater with 25VA 2x15V Trafo. All gain resistors are socketed, for tweaking. I'm still undecided on the volume control. I'm thinking of using two...- mideel
- Post #1,441
- Forum: DIY (Do-It-Yourself) Discussions
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eXStata DIY Electrostatic Amp for Intermediate DIYers
I placed my latest order on the 7th and reading from the FedEx tracking site: Apr 8, 2010 20:38 - Left FedEx origin facility - MANSFIELD, TX Apr 9, 2010 22:42 - At local FedEx facility - PARIS FR So yeah, Mouser orders seem to ship really fast (although the Estimated delivery date is still...- mideel
- Post #2,890
- Forum: DIY (Do-It-Yourself) Discussions
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eXStata DIY Electrostatic Amp for Intermediate DIYers
I placed an order for two triads (hard to beat the price) other parts are already on the way so I will be starting the build in a few days (customs willing ).- mideel
- Post #2,886
- Forum: DIY (Do-It-Yourself) Discussions
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eXStata DIY Electrostatic Amp for Intermediate DIYers
Thank you for the clarification, that made alot more sense. The VPS230-110 regulation is: "25% TYP @ full load to no load", so typically it will generate 125%*230V~288V with no load and since the eXStata is only drawing ~50% of the rated current you get alot more than the rated 230V. I think...- mideel
- Post #2,884
- Forum: DIY (Do-It-Yourself) Discussions
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eXStata DIY Electrostatic Amp for Intermediate DIYers
Quote: Originally Posted by runeight No, 440VCT will not work. Sorry. If you have a SS amp the triads will work very well. Can you not get these? Or their equivalent? It's not a matter of get its the postage, import fees and VAT hassle I'm more concerned about. So 460VCT is...- mideel
- Post #2,882
- Forum: DIY (Do-It-Yourself) Discussions
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eXStata DIY Electrostatic Amp for Intermediate DIYers
Ah, yeah I was confused, sorry about that I was confused about the 250-0-250 since thats just away of saying 500V CT. Using two 110V secondaries would be 110-0-110 or 220V CT. So if I connect two 230V primary windings parallel, and four 110V secondaries in series that gives me 220-0-220 or...- mideel
- Post #2,876
- Forum: DIY (Do-It-Yourself) Discussions
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eXStata DIY Electrostatic Amp for Intermediate DIYers
I have most of the parts in the mail for an eXStata solid state build, but I need some help in selecting the last 2 parts of my build: Transformer and stax jack. The Triad Magnetics VPS230-110 as specified in the BOM for the SS build is 2x115VAC (25VA), but in the triad wiring page is described...- mideel
- Post #2,872
- Forum: DIY (Do-It-Yourself) Discussions
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Cavalli EHHA Embedded Hybrid Headphone Amp
Quote: Originally Posted by Horio V drop => (16.4V-0.6V)-12.6V = 3.2V P to dissipate => 3.2V*2A = 6.4Watts Per the TubeCad.com blog, with the LM1085 with the 2.5" heatsink can shed about 8Watts. You might be a little off on your calculations, using the guide from AMB I get...- mideel
- Post #1,416
- Forum: DIY (Do-It-Yourself) Discussions
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Auzentech X-fi Bravura 7.1 Sneak Peek
Quote: Originally Posted by greenarrow Greetings fellow Bravura owners, need some inputs on this card as I'm a noob. Can I connect the Bravura digital output to my audio-gd compass using the supplied cable? Will the sound from this connection be better than using usb from the pc? I'm...- mideel
- Post #289
- Forum: Computer Audio
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We Got Ti Kan (AMB) an HD800!
If there is still room on the list, count me in!- mideel
- Post #264
- Forum: DIY (Do-It-Yourself) Discussions
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The argument to end all cable wars
Quote: Originally Posted by pdupiano 4. Lastly realize that when people do DBT, they are in fact taking part in the lay-man's science (I don't know of a better way to word it, sorry). What they lack are the following 1. Testable Phenomenon: -For something to truly follow the...- mideel
- Post #54
- Forum: Sound Science
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X-Fi noisy, need a DAC?
Quote: Originally Posted by RampantAndroid Same here - noise when I move the mouse. What are some good USB DACs? I don't see a listing here really...just individual threads... Thanks again! RampantAndroid the noise you get comes from your computers PSU and GPU through the...- mideel
- Post #10
- Forum: Computer Audio