You can find it in the header menu, or just click here: https://hallmanlabs.com/discrete-op-amp-review-pt-1-of-3-detailed-info-pics-of-hw-tips-to-avoid-trouble-more/ Be sure to read the note to the reader if you are going to read … Continue Reading Discrete Op-amp Review #2 Page has Launched – Part 1
Amanero: Upgrading Sanyo Oscon to Vishay BC capacitors | 1x SS3602 Sparkos Goes To Sparks, Literally
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
We Have Finally Cracked the Nut! Native DSD Decoding over I2S Up and Running! (A Preview In Photos included)
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!
Precision Resistors Lot : Over 12,000 Dale & Vishay RN55C Military Spec Resistors! An EBay Treasure Chest
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!
Kimber “Kables” Testing At Hallman Labs: The Skin Effect (Signal Freq vs. Conductor Gauge) & Cryo “HiFi Fuses”! (Update 1/25/18)
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!
Sneak Preview of ES9038Pro + Amanero Powered DSD Review: Burson Audio vs. Orange Amplification (Op-amps)
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.
“It’s the final countdown!” (to the) HiFi Discrete Transistor Op-amp showdown. Burson Audio vs. Orange Amplification Amplification! (DSD256+)
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
Link for PayPal.Me, a new direct fundraising system meant for similar purposes as GoFundMe without the middle man since almost everyone has PayPal.
Various high quality pictures of this rare Amperex Holland 7308 Bugle Boy
It’s finally time to rip that CRT 100 MHz Oscillscope a part just to see what is inside this well known affordable scope for entry audio work. I find more than a few surprises, including multiple pots mounted up to 11″ from the knob on the panel.
“In 20 years of tube collecting and tube selling, this is the FIRST real Bugle Boy 7308 I have ever seen! It appears your tube was originally imported into Canada, as it has HOLLAND etched into the glass at the top. This was standard for all Philips/Amperex tubes that were imported or sold in Canada. It is just possible that for some reason the Bugle Boy labels were only sold in Canada? The Holland name sandblasted into the glass is only seen on Dutch Philips or Amperex tubes coming out of Canada.
I think, due to the extreme rarity of a real Holland made and date coded 7308 Bugle boy, that 99% of those you actually encounter are fakes from Richardson Electronics. Your pictures do reinforce some facts that still tell the real thing from the fake: The fake 7308 or 6922 tubes NEVER have date codes or production codes on them. Yours does, so I will concede that you have one of the very few real Bugle Boy 7308 tubes in existence.” – Brent AudioTubes.com/6dj8.htm
LCD module for Q8 v2.2 ESS ES9018-9038 DIY board had the header pins break during a fix. In the end my fix is more stable than that plastic/metal combo.
Updates on both my custom/DIY amplifier AND DSD capable DAC w/ DSD512 Native (Amanero + TCXO). This will be the hardware I am using to do my reviews for Burson Audio and Orange Amplification (mainly the DAC due to 4 positions open for op-amps). Stay tuned for incoming full reviews (after I build the DAC 100%).
Dear Burson Audio and Orange Amplification:
I want to thank both of these companies for being so patient with me over the summer as I pushed through two of the hardest engineering courses so far in 10 weeks! I was hoping to publish the reviews for Burson well before now and be working on Orange Amp's review by now. However that just hasn't panned out due to my school requirements on time.
I most likely will have the time in the next few months to do the detailed and quantitative review style that I have discussed with both Burson Audio out of Australia and Orange Amplification out of the UK. I am very lucky to have the chance to do these reviews and if nothing else, I have had an extra amount of time to listen to the hardware I will eventually review. I say by the end of August I will have two more reviews including video build logs for the 100W x2 MX50 SE + Avel Lindberg's 160VA 22V-0V-22V (DC) Toroidal transformer design which should give an end to the 60Hz buzz so commonly heard on just about any A/V Receiver running on a standard 120V outlet. I will also be using a rectification PSU board linked in my previous post.
Project MXercury-Lindberg 50SE/160VA: At this point I can’t comment on the functionality/performance of the NobSound™ MX50 SE kit, but I wanted to make sure to post a few pictures that … Continue Reading 100W Power Amplifier x2 Design (Mono-block style) + Toroidal Transformer
By: Keith Hallman | July 3rd, 2017 Any law enforcement branch in the United States has to have probable cause or strong suspicion that a person or entity is involved … Continue Reading Kaspersky Labs – A Story of “The Company You Keep”
What a fellowship of harmony it is! These discrete designs from Orange Amp just BARELY fit side by side in the Creative ZXr. Initial Impression: I heard an obvious tone change … Continue Reading Orange Amp + Burson Audio V5-OPA
I was excited to see Orange Amplification’s Dual-DIP discrete op amp arrive!! This looks more like Burson’s previous generations (V2 & V3) with the discrete circuitry exposed. I will be interested … Continue Reading Orange Amplification Review Sample Arrives!