Pete Millett's DIY Audio pages

Time 2020-11-06 03:02:57

Web Name: Pete Millett's DIY Audio pages

WebSite: http://www.pmillett.com

ID:106399

Keywords:

Millett,Pete,DIY,

Description:

technical books, tube data, vintage data, transformer data, and McIntosh data,go to: www.tubebooks.orgLast update: 4/9/19 - Added aNutube balanced (differential) amp for headpohone or line amp usePLEASE READ - Commercial usageof information on this site:I consider all the information that I post here to be in thepublic domain. So, you can use it however you want, for commercial or non-commercialuse.That said, I would appreciate it if you at least let me know ifyou are going to use any of the circuits or especially PCB Gerber files to make commercialproducts, or to sell bare PCB's.There are some cases where products are being sold not only withmy permission, but active involvement. The Millett Hybrid effort and others at HeadFi are examples(and excellent models of how the DIY community should work, in myopinion). There are other cases where I have asked vendors to sell PCB'sas a service to hobbyists. And there are other cases where companies are manufacturing andselling PCB's, chassis, etc. without contacting me at all.In ALL of these cases, I make no profit from any of thesales. Zero, zip, nada. I have a normal day job thatpays the bills, this is strictly a hobby with me. So please do not expectme to provide the level of technical support that you might expect when buying aproduct. I try and help, but it sometimes takes me days - even weeks ifI'm traveling for work - to respond.Thanks for your indulgence in reading this!All that said... I do sellthings, including projects I no longer need, PC boards for my designs, andoccasionally parts and tubes. I do this through eBay - I maintain an eBay store pmillett . You can clickhere to see what I may be selling at the moment.mostly tube - thatI've put in the public domain, as well as additional info to support magazinearticles that I've written, and an ever-growing amount of technical data archivesrelating to vintage and tube audio. I'm constantly adding and updating things,so come back every once in a while and see what's new. Remember:you may have to hit the refresh button to see the updated versionsof pages!Follow the links below for detailed info.... Most picturesare hyper-linked to full-size pictures, so you can zoom in if you click on them.If you have questions please feel free to e-mail me at:Please,if you send me e-mail, make sure that there is a logical subject , oryour mail will get dumped along with all the junk mail (spam) that I get - it'sup to about 100 junk e-mails per day now. If I don't respond within a fewdays, try again, just in case I missed your message. I try and returneverybody's mail within a week, though I travel quite a lot for work and find Iget very behind at times. Please be patient...Standard disclaimer: This info is provided with noguarantees as to accuracy, usefulness, etc. There's no guarantee that ifyou try and build anything like this stuff that you won't electrocute yourself,the kids, or your cat, or burn your house down... especially if you don't know what you're doing.Be careful!Many files on this site, especially scanned documentation, arein Adobe Acrobat (PDF) format. I recommend that if you don't already haveit you download the latest version of Adobe reader. Some files havecompressed images that may not work correctly with older versions of Acrobatreader.Scanned vintage books, manuals, catalogs, papers... Pleasego to www.tubebooks.org for thismaterial.Audio projects and experiments:Power amps The NuclassD 50W class-D hybrid amp using the nutube A hybrid (SS driver) class A2 DHT amp A 50 watt monoblock version of the Engineer's Amp PL177 single-ended amplifier La Luxuriante stereo R120 SE amp Fatboy , a low-distortion zero-feedback push-pull 300B amp compactron triple-triode driver for push-pull amps Mr. Potatohead 815 amp - 50W from 2 tubes in class AB2 The 807 Push-Pullamp using driver boards below Push-pull driver PCB, a (nearly) universal driver for push-pull amps Jonokuchi , a single-ended tube headphone / speaker amp Class-A2 1636 amp using a power opamp driver The Engineer's Amplifier , an affordable, high-performance push-pull TV pentode amp The Unnecessarily Complex 300B Amplifier (from audioXpress 2009) The 307A tube, and a push-pull 307A amplifier The Glowing Hybrid amp The Mighty Midget (from audioXpress 5/08)Low-voltage Hybrid amplifier with adjustable damping A Single-Ended E-LinearAmp (from audioXpress 4/05) Push-pull6B4G class-A amplifier Push-pullKT88/6L6/EL34/2A3/300B amp with universal driver / power supply PCB 813single-ended triode amp withmicroprocessor-controlled power supply829Btriode-mode SE amp2-8watt push-pull amp using 7044 computer triodes EL802 push-pull single-stage spud amp experimentEL34 active-loaded (SRPP) parafeedamp experimentPreamps / Line StagesA Nutbe Balanced Amp - a true diferential amp for line stage or headphone amp use buffer PCB using the Korg Nutube 6P1 low-voltage DHT el escorpion , a simple line stage in a cigar box that runs off of 12VDC A solid-state LR phono preamp (no caps in the EQ) from ETF.13 A high-end Tube Microphone Preamp ALow-mu preamp (from AudioXpress 2/04) Pentode phono preamp Headphone Amps NuHybrid headphone amp, a hybrid headphone amp using the Korg Nutube DIY Butte solid-state headphone amp Jonokuchi , a single-ended tube headphone / speaker amp The StarvingStudent hybrid headphone amplifier WheatfieldAudio HA-1 tube headphone ampLow-voltage tube hybrid headphone amp - the original Millett Hybrid amp (from AudioXpress 11/02)WheatfieldAudio HA-4 headphone amp (solid-state, with crossfeed and EQ!)SRPPECC99 tube headphone amplifier (drives AKG K1000's!)Test equipment Abreakout board for banana cables audio dummy load A Sound Card Interface / AC RMS Voltmeter you can build Tube-regulated high-voltage bench power supply Softwarefor the HP 8903 audio analyzer - Make professional plots from thisaffordable audio test system! Other stuff DC Power supply board used with the NuclassD or class AB power amps (look down the page) Opamp power supply (used with the LR Phono, look down the page) Voltage selector PCB for transformers like the Hammond 300-series with multi-voltage primaries A power supply PCB for B+ supplies using the Tentlabs MEC Mini Electronic Choke linear USB adapter , a 5W power supply power (AC) sequencing board for big amplifiers 10W B+ flyback supply (switching power supply) that runs off of low-voltage DC (5-20V) Muting relay PCB to eliminate the thumps two-channel shunt-regulated adjustable bias supply High-voltage regulator ( Maida regulator) that fits Landfall Systems heatsink Tube amp power supply PCB with bias supply An isolated current sensor board to measure plate current using a PanelPilot meter MOSFET follower buffer for class-A2 grid drive Opamp experimenter board Asimple regulated DC power supply / filament supplyTubeactive crossover High-Frequency filament converter for DHT's Speaker projects:MLTQWP speaker using the Jordan JX-92S driverAdireKIT281 experiencesBertDoppenberg's TQWP project Downloadable drawings for An AffordableFull-Range Speaker Project , AudioXpress 6/03 (uses Fostex FE-164) Glass Audio and AudioXpress articles:audioXpress has been gracious enough to allow me to reproduce heresome of the articles that I've written for Glass Audio and AudioXpress magazinesin their entirety: A Low-Mu triodePreamp (1.3MB PDF file) from AudioXpress 02/04 Build A Low-VoltageTube Hybrid Headphone/Line Amp (612kB PDF file) from AudioXpress 11/02- the original Millett Hybrid . Power Transformers For Audio Equipment (1.3MB PDF file) from AudioXpress 6/01 All About Wire (476kB PDF file) from AudioXpress 8/01 ThePower Line Interface (1.3MB PDF file) from Glass Audio 6/00Miscellaneous technical information: LR Phono Preamps presentation from ETF.13 (PDF or PPT) Whereto get stuff - an assorted list of some of my suppliers Tektronix power transformerinformation - Info I've collected on classic tube-type Tektronix powertransformers ResCalc, a cool utility programyou can download that calculates combinations of standard resistors to get aparticular value. Parts shopping in Asia (sorry, getting a bit out of date) The Sound of Distortion presentation from ETF.04 High-Gm driver pentode test dataIxyscurrent regulator as a CCS plate load CADprograms for the DIY'erOther non-audio stuff: A picture collection of interestingold QSL cards that I received in the early 1970's.Who I am:A lifetime electronics geek, I got a ham radio license at the age of 8 and afirst-class commercial radio license at 14. I'm just old enough that Iactually build and used tube some stuff when it was still in production. I've been an electrical engineer fornearly thirty years, doing mostly computerand consumer electronics design work. I owned and operated Wheatfield Audio,which made tube headphone amps (but no money!) for a few years. I alsohave written articles for AudioXpress magazine (formerly Glass Audio) on occasion.I do some commercial audio design work outside of my day job . Some of mywork includes the Apex Hi-Fi product line,which is sold by TTVJ (Todd the Vinyl Junkie).I'm currently living near Fort Collins, Colorado, and work for a Silicon Valley semiconductor company.These are the Wheatfield Audio HA-1 and HA-2 tube headphone amps, which I designed a long time ago:I've put some info from the oldWheatfield Audio web site here that might be useful, especially if you ownan HA-1 or HA-2.

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