Diyaudio forum 6 4
Whether your personal audio hobby flavor being just liking to listen music or building your own audio electronics or cabinets. This is thread will be oriented more towards the hardware projects, AKA electronics, cabinet designing and cabinet fabrication. I plugged in the black and red wires on my Mackies, does that count? Huge audio guy here, this should be a fun thread. I have many projects planned for once I move out and have my own place.
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AMB Laboratories DIY Audio Forums
By Cantilope , March 27, in Solid State. Cantilope 16 posts. Full Range 20 posts. December 27, With tremendous help from Chuck, a fellow diyAudio. June 16, December 28, I have never posted pictures on this site, but here are a few. A couple of things to note on my build is that I went dual mono,. He also included a pair of the T-brackets, mica insulators and a pair of the PCBs.
After budgeting my money and purchasing all the parts through Mouser, Parts Connexion, the diyAudio store and the local Ace Hardware, I set off on measuring and matching resistors and capacitors and followed 6L6's excellent build guide and Nelson Pass' instructions.
Chuck really helped me with biasing the Sony VFETs and then we set it up in his system to audition the amp. The DC offset was kept well close to mV on each channel with the final settings. Having a great local resource like him in the Twin Cities is a real blessing. It sounded like a freshly built amplifier on his very efficient horn speakers. We then tested it with his distortion analyzer to see how closely matched each channel was since the VFETs were not tested and matched by Nelson Pass.
The photo shows the spectral analysis for the right channel, which looks great. To my pleasant surprise, the left channel was virtually identical to the right channel. THD on the right channel measured 0. It was time to close up the chassis and take it back home to enjoy. Chuck advised me to give this amp a lot of hours for it to really settle in, but I have to say that I am already impressed. The sound is so natural and clear. After about 15 hours of total play time, this amplifier is starting to settle in.
The bass notes are more complete with detail, depth and sustenance. The soundstage is still growing in all three dimensions, separation and space are coming into better focus, and the dynamic range has also increased with greater slam and transient response.
This is a very solid amplifier and I can certainly understand why many would prefer this amp over a tube amp. In fact, it bears some resemblance to my McIntosh MC 6L6 push-pull stereo amp with that holographic presentation, warmth and body. I can understand where many Klipsch Heritage or classic Altec horn-based speaker owners would be very pleased with an amplifier of this calibre generating 15 high quality watts into 8 ohms. I have posted on these forums about my push-pull tube amps and some really good Texas Instruments Class D amps, and this Nelson Pass designed amp is one of the best in my amplifier collection.
It really has the soul of a tube amp, but it also has the desirable hallmarks of a solid state amplifier. It is an incredibly musical amplifier that allows me to get lost in the music. I really cannot rank my amps, because some are in storage or just don't work well with my KEF LS50's for a fresh comparison, but what I can say is that I will be keeping this Pas DIY amp in my system for a while.
This thing is a beast and weighs in at You did a tremendous job with building both of those amps. The reason I ask is because a good friend of mine used to own a Pass Labs Aleph 3 years ago and regretted selling it. Rich, I don't know what the BA-2 will put out. If I recall you can adjust the bias higher and higher and with more heatsink the more wattage you get. I also used the burning amp gain stage, which I recall is similar to the gain stage that is in the VFET.
I remember cranking my bias pretty high, way more than mv, hell its called the burning amp for a reason and I am a fearless amp builder As far as side by side, I have never compared them head to head, but I suspect they are both very similar. Something to note, is the gain stage on the BA has the ability to adjust the second harmonic, which adds the tube sound or takes it away.
Although I have the tools and Wdecho gave me a tutorial, I haven't yet adjusted this. What you really should do, is build the BA! I like to think the Aleph J is like the Ford F of amps, does everything well and if you only had one class A The others are more of a different flavor and are striving for more of a tubeish sound. The Aleph J is a good old well designed voltage source class A amp. I also like the option of balanced inputs with that build, and I used my Aleph Js I built a pair on my Jubilees and they sounded fantastic.
These designs are all in a class all of their own. J2 is a two stage, F3 a single stage design with less gain. I have the F3 which is a fine sounding amp with a very black background, zero noise. Chassis size are nearly identical but the XA heat sinks are much more elaborate which might well provide its ability to run cooler at over twice the power output. But power transistors are totally different also.
The XA plays everything bigger, deeper, sweeter than the F3. I wish I had the skills to roll my own, alas I do not —. I feel like this amp was made for speakers like these. The bass is deeper with more punch and the whole package is more dynamic and lively, but still very refined with detail, tone and timbre.
The soundstage is huge and deep as most people have observed with this amp. I currently have an Aleph J powering my 's and absolutely love it. It makes me wonder what an M2 or SIT-3 would be like. I bought my Aleph J from a guy who basically sold it for what he paid in parts so I feel like I'm playing with house money its so good but always wonder what could be with a different First Watt offering.
I had an AlephJ clone as a "winter amp. Game over I lost power twice in my latest home, but that is the only time they were shut off. I now have an F3 Clone. You just can't go wrong with Papas Creations if you can stand the heat in the kitchen, literally and figuratively. Also have the acclaimed Pass Labs XA25, quite enjoyable here too. As good the FW gear is, they are not designed nor do they surpass the main line gear, Pass.
Wow, those are interesting comments from the dealer as I've heard the opposite on occasion. Even heard one dealer say the SIT-3 is possible the best amp he's ever heard. One thing is for sure Nelson makes some great amps. Thanks for the reply! And as we know we all hear things differently. Both the XA and F3 sound terrific, each in their own way.
Ginormous transformer and extensive heat sinks make this so —. Pass designs all his FW gear to the limitations of using the same chassis for every series. You can post now and register later. If you have an account, sign in now to post with your account. Note: Your post will require moderator approval before it will be visible.
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The first upgrade was a switch from Salas BiB 1. I wrote about the upgrade on the official UltraBiB thread:. This thing is remarkable. When we swapped it in place of the BiB 1. The next upgrade was when I upgraded my firmware to the newer firmware rev.
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User Name Remember Me? Flying Canuck. One of the first things I'd like to do is add a second COM. Now, I like to tinker and sometimes I come up with ideas that should never see the light of day. My current idea might be one of those so I thought I'd put it out there for comment. As we all know, audio panels are painfully expensive.
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Well done! Speakers: Spendor SP1. Cables: Various, mainly Mark Grant.
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We are waiting for the continuation. Of course, rather exaggerated, however, personal experience shows something close to what is described.