Finally got a balanced (XLR in) headphone amp. 2.8 MHz is native DSD64 converted by DOP (DSD over PCM). This is a picture from my phone, but I wanted to … Continue Reading Preview of Hardware Reviews in Progress with sAp-10 – Balanced Headphone Amp under $200 (also the Burson Play DAC/Amp)
One of the other projects moving through my workbench is this sweet combination of excellent bare bones pre-amps using discrete op-amps from Burson Audio! For now I just have a … Continue Reading Old Meets New: Kenwood’s C-2 “Basic” Pre-amp gets a Burson Audio V6-OPA Facelift!
Update – May 15, 2018: I have almost finished restoring the bottom of the unit (where most of the components are) and expect to have it working in the next … Continue Reading High Res Photos of My New Sprague Tel-Ohmike TO-6A
I have been slowly working on this project behind the scenes, without posting about it much (aside from on ComputerAudiophile.com). This is a “discrete” delta-sigma digital to-analog converter (DAC) developed … Continue Reading DSC1.Difference : Update on the DSD Dedicated No-DAC (DAC)!
After weeks/months of trying to get my Cornell Dubilier BF-50 cap analyzer to show what is expected for a good cap vs. a known bad cap, I reached out to … Continue Reading Hallman Labs Capacitor Analyzer : Sprague Tel-Ohmike TO-6A
Update 3: The case is basically finished now, just waiting on a few more minor parts to show up! Here is the first photo from my real camera (Samsung NX3000). … Continue Reading The Corsair 740 Air: Hallman Labs New Primary Desktop (Case) (Updated 4/14/18 w/ New Pictures, 99% completed)
Wanted to let everyone know another section has been added to the website, a pretty basic addition, but worth noting so readers don’t overlook it, should it prove useful. So … Continue Reading Quick Access to All Hallman Labs Related Files | Documents/Download Page Launched
I was using my Cornell Dubilier BF-50 (vintage) capacitor analyzer with all of the right things showing on the “Magic Eye” 6E5 (Philips JAN (Mil-Spec)) electron tube’s eye for leakage, … Continue Reading “Help”: My Cornell Dubilier BF-50 Is Testing Open Circuit as Good | Note : Treble Bleeds Halted
Well I currently have about 8 pages written of notes, thoughts on head to head Burson Play vs my custom ES9038Pro DAC. In the end it ended up … Continue Reading Apologies to the Neighbors (Burson Audio’s DAC Testing Reached 100.00dB max!!)
After much delay, I was able to go and pick up the Burson Play DAC today. Included was an entire set of both the V6-OPA-D Vivid + V6-OPA-S Vivid and … Continue Reading Burson Play DAC Arrives
Hallman Labs first official products for sale will be treble bleed circuits for guitars! When you dial down the volume on your guitar (with any pickups) the high frequency is … Continue Reading Hallman Labs 1st Product for Sale (Soon): Fixed Resistance Treble Bleed Kits V1.0 & V2.0 (Thoughts on V3.0 & V4.0)
First off, I wanted to let everyone know that I plan to publish part 1 tomorrow night/Sunday morning instead of tonight. This was mainly because of the amount of time … Continue Reading Amanero: Upgrading Sanyo Oscon to Vishay BC capacitors | 1x SS3602 Sparkos Goes To Sparks, Literally
Hallman Labs is branching out and this is the first of our guitar related articles! After reading the “25 Essential Les Paul Mods” I learned that the shiny metal covers … Continue Reading Uncapping Seymour Duncan Pickups – Schecter Tempest Custom
I have to say that solving the mystery of this hardware arrangement was both hilarious and extremely frustrating. Trying to catch one of 6 pins being rearranged is easy to … Continue Reading We Have Finally Cracked the Nut! Native DSD Decoding over I2S Up and Running! (A Preview In Photos included)
Here is a sneak peak at my reference DAC for all of the upcoming op-amp reviews. The Asian holiday really put a delay in this, but as always the hardware … Continue Reading The ES9038Pro DAC Returns! Expect Part 1 of Discrete Op-Amp Review by 3/10/18 (Saturday night)
Below is the 3rd official video from Hallman Labs. This is a time lapsed build log video for the common GM328 Transistor/ESR Testers. This one uses a more compact … Continue Reading Time Lapsed GM328 Transistor/ESR Tester + More Build Video
I had to wait for the Asian holiday to end (Feb 22nd) for the seller to ship out a replacement ES9038Pro completed DAC, in the enclosure with dual toroidal transformers. … Continue Reading Replacement ES9038Pro DAC Now In Route!
As I mentioned in the previous article, I will use EBay as a vintage or high end/HiFi electronic components supplier when I see a deal. I have bought many … Continue Reading Precision Resistors Lot : Over 12,000 Dale & Vishay RN55C Military Spec Resistors! An EBay Treasure Chest
EBay is by far one of the largest online selections of vintage electronic components in the world. I shop here when I see a deal worth buying, usually in bulk. … Continue Reading Ultra Rare ELNA Vintage Capacitor
Below is the original thread post I made over on ComputerAudiophile.com forums. I am posting it here in the chance someone reading knows what is going on and how to … Continue Reading Houston, We Have Lost Contact: ES9038P DAC Troubleshooting
I am working on uploading a video for this common question I see in chat rooms on IRC and on forums in DIY. The big things to remember when … Continue Reading Making Custom I2S Cables
I didn’t record this soldering job because I was not expecting this to go well. I had one of my oscillator sockets (only socket without an oscillator) get destroyed between … Continue Reading Revived The Amanero! + Close Up of Uncapped Crystek CCHD-575 Oscillator!
Update 1/25: I realized after reading my own article and the quotes from Kimber cables that I had wired up my setup incorrectly. Kimber has one conductor carrying the … Continue Reading Kimber “Kables” Testing At Hallman Labs: The Skin Effect (Signal Freq vs. Conductor Gauge) & Cryo “HiFi Fuses”! (Update 1/25/18)
Update 1/21/18: I wanted to let everyone know how impressed I have been with this unit by just using the stock 5532 op-amps with this Douglas Self based circuit design. … Continue Reading DAC Accessory: XLR In -> RCA Out (Ckt Based on D. Self Design) Updated 1/22
So this is really exciting! In the last year we have seen traffic from 69 countries with increasing views per visitor too! I wondered if I could reach this mark … Continue Reading Hallman Labs 1st Milestone: 1000 Views in 1 Month + Visitors are up nearly 2x!!
In the photo below we have 4x Burson Audio V5-OPA-D, 4x Burson Audio V5-OPA-S, 3x V6-OPA-D “Vivid” along with two Orange Amplification discrete (Dual-DIP). Two of the V6-OPA-D casings lifted … Continue Reading Discrete Op-Amp Review, Prelude: Photos of Review Hardware (Burson V6-OPA-D “Vivid” Unskirted)
I wanted to let everyone know just in case you don’t notice the new sections popping up on the website. Slowly I am branching out to other areas besides … Continue Reading Two New Sections Added to Hallman Labs!
A quick look at Hallman Labs collection of DAC accessories or add-ons. Part 1
Quick shot of the ES9038P DAC up and running using optical output from the Creative ZXr to the ES9038 Optical Input.
Literally just posting some new pictures because I had a few people asking to see what this looks like with the high end discrete op-amps, so here you are! Thanks … Continue Reading Pictures of ES9038Pro DAC w/ Burson Audio V5-OPA and Orange Amplification’s discrete design!
Just a few pictures of the 95% finished ES9038Pro + Amanero DAC build and a few words on why it took so long!
In order to verify the vintage capacitor collection I slowly attained all perform to spec, I started to look for capacitor analyzers. The most well known is the Sprague TEL-OHMIKE … Continue Reading Cornell Dubilier BF-50 Capacitor Analyzer
I have the ES9038Pro DAC playing both DSD/DSF and the more well known, high res capable codec, FLAC. Except on this DAC it goes up to 32 bits and 384 … Continue Reading Procedure For Mounting Transformers (One of Many Ways) for ES9038Pro DAC + Amanero
Finally have the DAC OLED screen coming on and the Amanero is recognized in Windows!
Thanks to Hifiengine.com I was able to get my hands on the official service manuals and the owners manuals + every schematic!! HiFiEngine is free to register and after that … Continue Reading Sansui AU-517 Works!! (Schematics & More Inside)
Below is a traffic insight map from one day of views on my site (Nov 25th, 2017). At first I was confused, but then excited about the fact people across … Continue Reading Hello there Europe & Asia!!
For being 39 years old, this amp is nearly spotless inside. I’d venture to say it may have been opened once before I inspected it myself. Keep in mind that … Continue Reading More Sansui AU-517 Internal Shots
To my surprise someone donated a Sansui AU-517 to me for free, thanks again for that! Here we have a stereo amplifier that weighs in at 40lbs! This behemoth is … Continue Reading First Amp Donation! Sansui AU-517
Once again the values needed for the power to the DAC have changed, waiting yet again on the correct transformer.
I wanted to give anyone still putting up with my unusually long delays between reviews a sneak peak of what is coming soon! I have everything ready to go for … Continue Reading “It’s the final countdown!” (to the) HiFi Discrete Transistor Op-amp showdown. Burson Audio vs. Orange Amplification Amplification! (DSD256+)
I purchased the entire lot of parts on Ebay for $30 shipped to my door. I had done enough research that I knew of 2 parts in particular that could … Continue Reading 1950’s to 1960’s Hammond Organ ($30) Parts Pull Highlights