What did you do to your stereo rig today?

pitdogg2 wrote: »

motorstereo wrote: »

This just arrived............ now I have something to do

What is it?

Shake Weight....

Swapped out some different amps and blasted some tunes today for the first time in a long time.

nooshinjohn wrote: »

motorstereo wrote: »

....my lips are staying sealed as tight as my 1.2tl cabs.

Given that even the best sealed SDA cabinet with stock drivers have a leak-down, you will be blabbing away in 4.... 3.... 2.... 1....

True dat.........I'd love to have a 2 day leakdown

Nice job on the Aria @phipiper10. I love mine.

@phipiper10, "for only $50 more I could get a new MK3"... this sounds very similar to how I ended up with my Planar 8. Hard to turn down NIB/full warranty for only a little extra coin up front. It is also my understanding that the mk3 Aria was just a cosmetic casework change. I bought my mk2 used off Agon and it was a big improvement from the fono MC it replaced.

Currently, my TT rig is a new model Planar 8, Apheta 3 MC cart and the mk2 Aria phono stage. I am very happy with how everything sounds and finally feel like I am done with the TT tweaks and upgrades.

I had the original Ania prior to the Apheta 3 and the Apheta is a much better cartridge (as it should be for the cost increase). I really think a lot of it comes down to the stylus profile. The blunt stylus shape on the Ania causes it to pick up more surface noise on records and while it tracks pretty well, my Apheta is much less likely to skip on records with imperfections. The Apheta rides deeper in the groove with its "fine line" stylus profile and is more detailed than the Ania was.

That being said, the new Ania Pro with its improved stylus profile is an interesting option for someone that doesn't want to spend Apheta 3 money. My Dad has a new model Planar 6, Aria mk3 and he just recently traded in his Ania for an Ania Pro and he seems very content. We live several states apart so I haven't been able to hear it yet unfortunately.

Spam alert! Nice gear for a spammer!

Well, I have received the J2! It is absolutely wonderful. (To my ears) To me,it lives up to all the high praise this amp has received online. The F5 now resides in the Pit. At some point I may swap,and run the J2 in the pit.

@halo
What are those white things in front of your stand and what do they do?

Thnx Tony

Congrats Victor on the return of your speakers. My first dedicated Two Channel Tube Amplifier was the TAD-60, should have never sold it.

I just brought the First Watt J2 and put it into the system in the Pit. The first disclaimer is I do not listen loud. I’m at about 74db at about 7 ft from the speakers. The J2 is paired with a TVC passive pre,driving a pair of Graham Chartwell LS3/5’s. These are an easy load,but not a very sensitive speaker. I just pulled the F5 out and swapped in the J2. The first thing I noticed right out of the gate is a taller soundstage,and there is definitely more separation of instruments. I’m sure things will settle in once the J2 hits operating temperature. The F5 runs warm for sure. The J2, hot as a tin roof in August! This amp should definitely NOT be placed in a cabinet. IT GETS HOT! But the sound! Did I mention the sound?? Tonality wise, the F5 and J2 are very similar. The F5 might show a little more detail,but the soundstage winner is the J2.

I’ll update again as I get more saddle time here in the pit.

Hey Doc,
They are 9ohm.They are the LS3/5. No A on the end. These aren’t the vintage version. They were made in 2015. The J2 plays well with an 8ohm load. Some weird specs. 25 watts into 8ohms,13 watts into 4ohms. The amp has no issues with my Hornshoppe Great Horned Heils. So far, no issues with the Graham Chartwells. It’s been fired up for about an hour and a half,and it is toasty! Next test,I will put the Nola Boxer 2’s in there.

TEAforONE wrote: »

Some weird specs. 25 watts into 8ohms,13 watts into 4ohms.

behaves more like a current source. Most amps behave more like a voltage source

J2 Power Amplifier

The J2 is a stereo power amplifier rated at 25 watts per channel. It has a two-stage circuit that operates in pure single-ended Class A mode, with signal JFET devices forming the input stage and power JFET devices for the output stage.

JFET transistors have long been recognized as having the highest audio quality of any transistor; the input devices of the J2 are known through the industry as the standard for low noise and linearity, and are found on the inputs of the finest phono stages, line level preamplifiers, and power amplifiers.

But for over 30 years robust power JFETs have not been widely available since the short-lived efforts of Sony and Yamaha. In the last few months, advances in Silicon Carbide (SiC) technology have resulted in new power JFET transistors with high voltage, current, and power capabilities – as high as 1200 volts, 30 amps, and 273 watts.

Created by SemiSouth Corporation of Mississippi, these robust new JFETs are designed for very fast high power switching in solar power and electric car applications. However, they also have a very low distortion characteristic that makes them superb for use in linear amplifiers. In apples-to-apples comparisons with comparable MOSFET type power transistors, they can achieve 10 to 20 dB improvements in distortion performance.

For over 10 years First Watt has been pushing the design envelope with simple high performance Class A amplifier circuits, and when a better transistor like this comes along, it can mean getting the same distortion performance with a lot less feedback, or lower distortion with the same amount of feedback. The J2 does amplifier does both,and that helps make it a better sounding amplifier than the best of its predecessors.

With a device that behaves a little like a tube, it is natural to consider popular tube amplifier design topologies. Single-Ended Class A tube amplifiers are not very powerful, and their measurement numbers are not exceptional, but there is no arguing that they have strong musical appeal to much of the audiophile population. The J2 amplifier uses a classic JFET differential input stage followed by a single power JFET transistor. This power JFET is biased by another JFET in what is known in tube circles as a “mu follower”.

Here is a slightly simplified schematic of the J2 circuit. It could be a classic tube amp, except that the P channel input JFETs would have to be fabricated from anti-matter. The single-ended Class A output stage is “second harmonic” in character, and it uses about half the feedback of a comparable MOSFET circuit but with half the distortion and twice the bandwidth.





The J2 power amplifier is simple, clean, and measures astonishingly well. It achieves a sound which is warm and relaxed, combining precision and detail without sterility. With a pair of sensibly efficient loudspeakers, it will give you a toe-tapping experience that other solid state amplifiers do not. The design is extremely reliable and will never need adjustment.

Download: J2 Manual

I copied and pasted right from the First Watt site.