Aikido headphone amp. I am working with Jhofland and we ...
- Aikido headphone amp. I am working with Jhofland and we developed a headphone amp with a SET tube buffer stage which then drives the solid state OPA451 to make about 5W into 32ohms. The problem I see with using a 5687 for a 'spud' headphone amp is that it has gain of only about 10 to 15X. How much voltage and current does a 32-ohm headphone demand? Aikido Headphone Amplifier I built a headphone amplifier using John Broskie's Aikido All-in-One PCB with Tube Rectifier. Jul 1, 2022 · A picture and the schematic of my Aikido headphones amplifier that I've built a couple of years ago. The combination of Aikido Headphone Amplifers & PP Cathode-Follower Amplifiers Aikido amplifier printed circuit boards I got most of the parts on hand for my aikido octal headphone amp now. My goal is simply parts of decent Two Output-Stage Topologies The output stage can be configured either as the classic Aikido line amplifier or as an Aikido headphone amplifier. Aikido Amplifier Revisited I would like to built aikido headphone amplifier with FETs and with some buffer on the output to drive most variety of headphones. Do these sound good? Anything I should know about it? A photo and the schematic of the headphones amp i have finished, except for the housing. Greetings Friends, After a hiatus to deal with life, I am resuming my tube audio education. I can serilzie the I have a working 24V Aikido set up as a linestage preamp, I want to convert it to headphone duty with the BUF634's. It operates at 24V or 48V instead of the typical 200-400V for tube amplifiers. The document provides an overview and instructions for a low-voltage stereo tube amplifier PCB called the LV Aikido. Jan 1, 2015 · I have not heard or built either, but from the description I would opt for the ACF 2 (to provide more current ability as a headphone amplifier). Both are powered by a same power supply. This article covers the latter, a very nicely made PCB which features an octal (8-pin) tube OTL headphone amp circuit. SRPP Zen Headphone Amplifier Transformer-Coupled Aikido circuits The C-Moy is one of the headphone granddaddy designs and is still offered in a kit by several vendors. In this little OTL headphone amplifier, the output stage is simple enough. I picked you this half built Aikido pre amp with headphone out. I've tried 3 different HV supplies on my Aikido - one cheapo no frills (during testing), one 6x4 toob with ASC oil caps, Mills resistors, CRCRC, and another SS Mosfet pass regulator and it's a stretch to describe any changes in sound and/or noise level from any of them. com web site. Nobody can tell the sound difference between 6H30 or ECC99, both are great tubes. Unfortunately, a heavy idle current is needed to ensure large voltage swings into low-impedance loads. (The third from the bottom on this page) Aikido 9-pin mono PCBs and 5687 PCBs and hybrid tube headphone amplifiers I haven't seen this kit / PCB on the web store and I'm HOME HEADPHONE SYSTEM: Amp:: Bada PH12 tube/Mosfet amp, Headphone: Audeze LCD-3 (manufactured 5/16) with pure silver cables, Source: Eastsound E5 Platinum Reference CDP, IC: CT Silver Reference II, which is identical to the Acoustic zen Silver Reference II, Power: Tice Power Conditioner Unit with heavy cables Jul 9, 2006 at 1:13 PM Post #30 of 70 Aikido low-impedance headphone amplifier The design goal here is to build an Aikido headphone amplifier that can drive Grado 32-ohm headphones (or the 55-ohm version of the AKG K 240M), without resorting to a global feedback loop. photo: JDS Labs Electrostatic Headphone Amplifiers Now imagine an Aikido headphone amplifier with a 6SN7 input tube and a 6H30Pi output tube and a pair of Sennheiser HD650s and a big smile on your face and a green tint to your friend's faces. Aikido headphone amplifier Description: For some time we have been looking for a good headphone amplifier as a supplement to our BUF634 based one but this time preferably triode based, without output transformer and capable of driving low impedance headphones from 16 ohm and up. Several readers built the circuit and reported PS-24 and Quasi-Balanced Unbalanced Drive ES Update and Two-Triode Aikido. It is intended for my AKG 240 headphones (600 Ohm). It uses 6CG7 RCA clear top and 6H30DR, fully regulated supplies (Salas shunt reg for B+) and custom made C-Core output transformers made by AE Europe. The circuit works better than comparable designs by incorporating power supply noise into its normal operation, improving distortion, output impedance, and power supply rejection ratio. The new PCB is bigger and it holds a PS-1, high- and low-voltage regulated power supplies I have a friend building what he calls "an Aikido-influenced design" dedicated headphone amp - Class A triode OTL no feedback. diyaudio. Decided to go with solid state Just out of inintrest which Sowter Transformers are you using with the Aikido I have always wanted to build a headphone Amp to drive my 300 ohm Sennheiser HD650 with proper gaped single ended Transformer But have limited experience on what to look for in spec have you any suggestion for something with the 6AS7 or 2A3s or something like that Cheers Hi, I'm thinking about my first Aikido project and was looking at the 24v SE Hybrid with the DN2504N5 MOSFET output stage. How much voltage and current does a 32-ohm headphone demand? Aikido headphone amp based on the boards by Broskie (Tube CAD). I found a schematic for an Aikido front end 24V Aikido Line Stage and Headphone Amplifier 08 May 2009 New: The All-in-One Line-Stage/Headphone Amplifier The original Aikido All-in-One design combined a 9-pin Aikido line stage amplifier and high-voltage B+ power supply and a regulated low-voltage heater power supply on one PCB, thereby greatly reducing the stress level of many Aikido fanciers. Can anyone explain what this means - its implications in terms of operation, sound potential, and so on? I I am currently finishing a build of the 24V 6GM8 / ECC86 Broskie Aikido line stage amplifier and the space I have in the chassis is very minimal. Is there a simple way to modify the standard circuit to allow for headphone use? For example, can we increase the value of the output caps (C3) to HOME: : AMPLIFIERS: : PREAMPLIFIERS: : ACTIVE CROSSOVERS: : POWER SUPPLIES: : GALLERY: : CONTACTS HEADPHONE AMPLIFIERS: AHHA M1 -Broskie Aikido Headphone Hybrid Amplifier HIRAGA & JLH AMPLIFIERS : HIRAGA ''Le Monstre'' -Class A Bipolar Amplifier of Jean Hiraga What kind of transmformer is a Tango S-2014? I can't find any spec sheets for it. Nevertheless, JDS Labs provides an excellent instruction manual. A TO-247 power MOSFET works into a resistor load at its drain, making this output stage a class-A, single-ended design by necessity. I am currently finishing a build of the 24V 6GM8 / ECC86 Broskie Aikido line stage amplifier and the space I have in the chassis is very minimal. All those needs forced a custom PCB. The preamp was designed to be as general and setup-friendly as possible. The Russian 6N27P is considered an equivalent to the 6GM8 though I Audio cables are a pain and locating your high-end headphone amplifier in one place, usually next to your audio system, is also a pain. More information (in Dutch) and photos can be found in this and older postings on my site: OTL800: Headphones Amp klaar I built it for my AKG K240 headphones (impedance = 600 Ohm). Good luck. Everything is included to complete the build except for a chassis. I also wanted an external choke. The power supply is a simple full-wave rectifier with choke input filter. I just purchased an aikido amp bd and was wondering if anyone has built one of these before and if they used low voltage for their power source(28volts)?I was thinking of using a tread to power this baby. A headphone amp with an OPA541 output stage should handle it well. I've been using my "Brute Force" mu follower amp for headphones for many years but I needed something that could drive lower impedance headphones. Aikido Cathode Follower & More Triadtron Aikido Push-Pull I could use some help selecting the superior transformer for an Aikido PP headphone amplifier. Aikido Line-Stage Amplifiers This document describes a line stage amplifier circuit called the Aikido Amplifier. One comment is that R9, R10, and R13 (see the attached schematic) affect the distortion introduced by the circuit. Side note: this is the design your author started DIY audio with a decade ago. I’ve wanted to revisit an HPA made with 6GM8 tubes as I’d acquired about twenty of these some years ago when they were fairly cheap. Man was born free, and everywhere he is entangled in cables. It was designed to help a reader use three 12AU7 tubes in his line amplifier. But I do not have any clue about schematics, what type of FETs to use, what B+ voltage, what are the currents requierements. The schematic shows the power supply and one of the two channels of the amplifier. Projects by fanatics, for fanatics! Octal OTL DIY Tube Headphone Amp Another day, another headphone amp :) One of my life's pleasures is digging around on eBay for exciting finds, whether it be obscure vintage tube equipment or interesting/useful PCBs. Instructions explain assembly, components, and how The Aikidos require two tubes per channel, four dual triodes for a stereo preamp. It was originally a mu-follower with paralleled 6SN7s into paralleled 6BX7s and sounded very good with high impedance headphones, but I wanted something that could drive low impedances without transformers. The Aikido amplifier is a new tube circuit design offering improved performance and sound quality for audio enthusiasts. It is made of FR-4 fiberglass material with Cu-50 mikron + Pb track overlay (tinplated), drilled, with two sided soldermask, and with white component overlay. Is there a simple way to modify the standard circuit to allow for headphone use? For example, can we increase the value of the output caps (C3) to *originally posted in headphone systems but moved here Hi there, I am working on building a copy of the headphone version of the Aikido amplifier that was posted on The Tube Cad Journal some time ago here - MOSKIDO Amplifiers In particular, this circuit - I understand the operation of It is made of FR-4 fiberglass material with Cu-50 mikron + Pb track overlay (tinplated), drilled, with two sided soldermask, and with white component overlay. com/forums/attacamp=1170011751 Im new to this and I want to see peoples opinions of this and iif Finally got it up and running and it has a great sound, but I have a couple issues with hum. Figured i should setup my project thread. Also my first post here. I am looking to build an Aikido with this PS: http://www. I have a friend building what he calls "an Aikido-influenced design" dedicated headphone amp - Class A triode OTL no feedback. The heart of the Moskido is the Aikido gain/driver stage. Aikido Stereo 5687 revision-A schematic as headphone amplifier (32-300-ohm Load) B+ C5 C6 R6 Aikido 6GM8 (ECC86) Headphone Amplifier or How I built a tube amp with non-scary voltages. Can anyone explain what this means - its implications in terms of operation, sound potential, and so on? I A community dedicated to helping everyone learn the art of audio. Aikido low-impedance headphone amplifier The design goal here is to build an Aikido headphone amplifier that can drive Grado 32-ohm headphones (or the 55-ohm version of the AKG K 240M), without resorting to a global feedback loop. Did anything ever come of this? Also are there any kits that are set up stock like this (headphone amp, class A triode transformer coupled output)? Push pull would also be nice to have. The two output transformers that I am As mach1 has pointed out only the Aikido linestage is using the Aikido principle, the totem pole arrangement of two triode halves sitting on top of each other (don't shoot me when this is a somewhat crude abbreviation of how it works). Tube CAD Journal John Broskie's Guide to Tube Circuit Analysis & Design I know this is a truly ancient thread but I didn't find a newer one. Aikido boards/kits can be purchased from Glass-Ware through the tubecad. I have several 8FQ7, 8GU7, 6n1p, and 6n6p tubes. I found the Glassware schematic for the Aikido/WCF amp online so I decided to build it point-to-point. The PCB uses an Aikido circuit topology that improves power supply rejection ratio (PSRR) without feedback by balancing the tubes' nonlinearities. I've got it working now, it sounds great with Rebuilt my "Brute Force" headphone amp. I figure John Broskie's Aikido Headphone amp is a nice way to get warmed up, and I'd like your help in selecting reasonable resistor and capacitor types. The plate (anode) resistance of a 5687 with plate current of 20mA is going to be in the vicinity of 2k ohms. I'm not a DIYer and have no technical background. Built properly it can sound very nice since I built an Aikido headphone (noval) amplifier a few years back. The 5687 is a robust triode that can deliver a lot of current at relatively low voltages, making it ideal for driving headphones or other low-impedance loads. Jul 4, 2006 · Several people have built the linestage or headphone amp versions and have great results. To my mind a 12AX7 is not the best tube for a line stage. This opamp-based amplifier runs from a 9V battery and is about as simple as they come. The PCB is well made and easy to build, and I am satisfied with how it sounds. Headphones are the Sennheiser HD 6XX (HD650, 300ohm) and possibly a 32 ohm HiFiMan Sundara in the future. This looks easy, but can someone walk me through the connections? The original goal of this project was to have a compact octal tube OTL headphone amplifier that would drive low impedance headphones (down to 32 Ohm). BTW, the chasis holds a current sourced cathode follower tube buffer stage as well as the Aikido in headphone configuration (in that order). Bob Prangnell's schematics are for a 50 watt/channel class A amp using a 6SL7->6SN7 Aikido and a double pair of complementary MOSFET power transistors. The twist here is that two resistors are actually two tube heater elements in series. Personally I like the ones based around 6922s, ECC88s or whatever you want to call them. This preamp/headphone amp is the culmination of the separation of the DAC I had posted before and Aikido amp stage I was using with it. 0uwbrc, ct7w, 6u77, fyxlpp, h8br, fillea, eyil, 2lvpad, z7hml, flj2,