[audioguru1]

Thank you, cant find no detailed specs and certifications... sad at that price.

More to life than specs and measurements. I have compared caps with my ears and they improved things. A spec sheet doesn’t change that I like them. I am happy, and it’s my project. You don’t have to put Kaisei caps in yours.

 

[migo]

More to life than specs and measurements. I have compared caps with my ears and they improved things. A spec sheet doesn’t change that I like them. I am happy, and it’s my project. You don’t have to put Kaisei caps in yours.

no problem here really Serious manufacturer provide spec to their products, only that... I wanted only to compare standard parameters provided for caps. anyway thank you.

 

[audioguru1]

I’m curious what temps are folks seeing on the output transistors? I’m at 200mv bias, and seeing 55-60celsius on the actual MJF transistors (laser thermostat). I’m thinking about going 30v power supplies but thinking I may want more heat sink. But maybe I’m being too cautious. So! I am curious what others are seeing temp wise.

 

[migo]

I’m curious what temps are folks seeing on the output transistors? I’m at 200mv bias, and seeing 55-60celsius on the actual MJF transistors (laser thermostat). I’m thinking about going 30v power supplies but thinking I may want more heat sink. But maybe I’m being too cautious. So! I am curious what others are seeing temp wise.

I've dual mono 30V rails setup here with MJF transistors and bias set to 200mV too, but not measured temp. I'll try to attach probe on L profile and measure...

 

[RudeWolf]

60C on the transistors isn't too crazy.

 

[audioguru1]

60C on the transistors isn't too crazy.

Thank you! What would you say is the top limit, for safety margin. I mean the data sheet specs them very high (well over double) but I’m not sure that’s prudent.

 

[vkenz]

Thank you! What would you say is the top limit, for safety margin. I mean the data sheet specs them very high (well over double) but I’m not sure that’s prudent.

The specs are not wrong... they are there for a reason. Just that we got uncomfortable it seems to become a furnace.

 

[migo]

Mine is 42-43 deg.Cel. after 1.5h of listening. Ambient temp was 23. Probe is attached on L bracket behind last transistor on right by clip. But I'm not loading amp a lot, listening at relative low volume (200mV output from amp).

 

[rsbrsvp]

I have seen perhaps two comparisons of the CFA-3 to the Bliss. Anyone out there who has spent at least a few weeks with both have any more comparisons?

 

[audioguru1]

I have seen perhaps two comparisons of the CFA-3 to the Bliss. Anyone out there who has spent at least a few weeks with both have any more comparisons?

Not a bliss, but The CFA3 I built handily beats the ferrum Orr.

I believe the CFA3 is significantly more powerful than the Oor or Bliss.

There are also many ways to build a Cfa3, both parts, power supply voltage and bias… so there’s a fair bit of variation.

 

[rsbrsvp]

Not a bliss, but The CFA3 I built handily beats the ferrum Orr.

I believe the CFA3 is significantly more powerful than the Oor or Bliss.

There are also many ways to build a Cfa3, both parts, power supply voltage and bias… so there’s a fair bit of variation.

Indeed. I am refering to the maxed out version that Dukei has built for so many of us on this thread.

I had an OOR/Hypsos in my apartment together with my CFA-3 for several months and did comparisons all day. The Oor had the nicer tonality IMHO at first do to a natural tint of sweetness, but the CFA-3 just produced a substantially cleaner, more transparent, dynamicly explosive, and gigantic sound that dwarfed the OOR in totality. The power of the CFA-3 grabs those drivers and controlls them with a tightness and precision that the OOR could never hope to do. Of course, I realized immediately that the CFA-3 was not going to provide the coloration treatments which I felt I needed and I therfore got a DAC that would do the job- allowing the CFA-3 to just project that sound in the most powerful and accurate way possible.

Nothing I could do would enable the OOR to compete with the unbridaled muscle power, heft, and transparency of the CFA-3. It was like a professional weight lifter, vs an office worker; just not a fair matchup. But in terms of tonality- there was much that could be done for the CFA-3 in the area of my transport, cables, and dac to impart a proper flavour to the CFA-3;- so I choose that route- and I ended up with tonality, timber, and sonic density which is just absolutely luciouos- without giving up on the raw power, control, and dynamic slam of the CFA-3.

I am curious to hear more about the Bliss but it seems like very few have really spent time with both.... Short listens never tell the story as it really is...

 

[K3cT]

Indeed. I am refering to the maxed out version that Dukei has built for so many of us on this thread.

I had an OOR/Hypsos in my apartment together with my CFA-3 for several months and did comparisons all day. The Oor had the nicer tonality IMHO at first do to a natural tint of sweetness, but the CFA-3 just produced a substantially cleaner, more transparent, dynamicly explosive, and gigantic sound that dwarfed the OOR in totality. The power of the CFA-3 grabs those drivers and controlls them with a tightness and precision that the OOR could never hope to do. Of course, I realized immediately that the CFA-3 was not going to provide the coloration treatments which I felt I needed and I therfore got a DAC that would do the job- allowing the CFA-3 to just project that sound in the most powerful and accurate way possible.

Nothing I could do would enable the OOR to compete with the unbridaled muscle power, heft, and transparency of the CFA-3. It was like a professional weight lifter, vs an office worker; just not a fair matchup. But in terms of tonality- there was much that could be done for the CFA-3 in the area of my transport, cables, and dac to impart a proper flavour to the CFA-3;- so I choose that route- and I ended up with tonality, timber, and sonic density which is just absolutely luciouos- without giving up on the raw power, control, and dynamic slam of the CFA-3.

I am curious to hear more about the Bliss but it seems like very few have really spent time with both.... Short listens never tell the story as it really is...

It's from the Bliss thread coming from someone who had both so maybe it will help you.

 

[genefruit]

It's from the Bliss thread coming from someone who had both so maybe it will help you.

I'm reviewing and reflecting on what I had to say about CFA-3 and Bliss differences at the time. My thoughts still stand. In my opinion, they share a very similar end result but the differences are aspects that make the case to chose one over the other. If you want a commercial design that serves as a remote controlled preamp and can be in your hands in a matter of some clicks and wait 6 weeks, then pick the Bliss. If you want a design that can be customized to your use case, are willing to find a builder and wait on a number of factors, then pick the CFA-3. I was happy with the CFA-3. I'm happy with the Bliss. If I went back to the CFA-3, I'd be happy.

 

[rsbrsvp]

I had read the report from genefruit on the Bliss thread already and I appreciate the repeat. I was looking for any more listeners who may have an insight..

 

[audioguru1]

Indeed. I am refering to the maxed out version that Dukei has built for so many of us on this thread.

I had an OOR/Hypsos in my apartment together with my CFA-3 for several months and did comparisons all day. The Oor had the nicer tonality IMHO at first do to a natural tint of sweetness, but the CFA-3 just produced a substantially cleaner, more transparent, dynamicly explosive, and gigantic sound that dwarfed the OOR in totality. The power of the CFA-3 grabs those drivers and controlls them with a tightness and precision that the OOR could never hope to do. Of course, I realized immediately that the CFA-3 was not going to provide the coloration treatments which I felt I needed and I therfore got a DAC that would do the job- allowing the CFA-3 to just project that sound in the most powerful and accurate way possible.

Nothing I could do would enable the OOR to compete with the unbridaled muscle power, heft, and transparency of the CFA-3. It was like a professional weight lifter, vs an office worker; just not a fair matchup. But in terms of tonality- there was much that could be done for the CFA-3 in the area of my transport, cables, and dac to impart a proper flavour to the CFA-3;- so I choose that route- and I ended up with tonality, timber, and sonic density which is just absolutely luciouos- without giving up on the raw power, control, and dynamic slam of the CFA-3.

I am curious to hear more about the Bliss but it seems like very few have really spent time with both.... Short listens never tell the story as it really is...

I would agree. Though I don't hear tonality differences between them after months spent swapping parts around to compare. The Oor improves a lot w/ 24v from a GRLV, actually. Anyhow... the point I made above is there are many options that change the sound which those of us that have built them can do (and i'm pretty sure Dukei has varied too), there are different input stages (THAT340, Jfet, etc), different voltages (20, vs 24, vs 30, vs even more?), different bias (180-210), and even down to parts (I used a stepper Khozmo relay) which you can even choose different resistors in the volume circuit, and of course there are choices of caps (Slimic, vs AN Kaisei, vs Panasonic FC) and internal wiring. There are also different output devices you can select MJF, MJE and the older Motorola measure with lower HFE, also. I say all this to say voicing is what you want it to be, and requires tinkering. Its a DIY project... at its core. The Bliss is what it is, as a commercial product so its more static and comparable. The CFA is more difficult to compare b/c we all build them how we like.