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Everything posted by henry4841

  1. Does your pre have enough output to drive the ACA to full output? The one I built years ago that had plenty of power for my LaScala's in my room. It is an amazing sounding class A amplifier for what it cost to build. If you continue to like the sound you may want to go to another level and build the complete full version of a SE class A amplifier, the BA-1. More refined and taken to the next level.
  2. For those that do not understand or really care to know the differences in the classes of amplifiers being discussed here a very simple explanation is in class B operation the transistors cut off and on when amplifying the positive and negative portions of the audio signal. There will have to be other components added to manipulate the signal to not have what is called crossover distortion inherent in class B operation. In class A the transistors are operated full on never cutting off and on or slowing down not needing other components to defeat the associated crossover distortion. Many consider less components as better as I do. This is the reason class A is considered the most linear of all the classes of amplification and engineers like Nelson Pass have devoted his life to class A. The exception to every rule comes into play again with this statement about Nelson Pass. He has designed other classes as well but his main function has and is class A operation. All this does not really matter if an engineer can make and sell a product that sounds good enough to make a profit no matter how he achieves it. Personally I would hesitate buying an amplifier I know to be class B no matter who makes it. It just does not taste good to me knowing it is being operated in class B no matter who makes it when there are many others to choose from. But this is just me. I use to snub my nose up on class A/B until I built the diyaudio product called the Honey Badger which has many components and is operated in class A/B designed by everyone in a joint effort by members from all over the world. In class A/B the transistors are biased up where they never cut off and on but are not run full on either. Outstanding sounding amplifier. But I still listen mostly with my many class A amplifiers both tube and SS.
  3. Again, there are always exceptions to every rule when it comes to electronics and members here are quick to point them out. It is what happens on social media forums. Still not common on consumer electronic amplifiers. Class B was dropped decades ago by most designers considering A/B the better and simpler way to design amplifiers. All I can say about McIntosh is good for them.
  4. What kind of idiot is going to listen at 121db at home? If you want that there is something wrong with you or too much listening at too high a level in the past. I knew this was going to be an interesting discussion but when I said 25 watts SS I meant real world in your house when most never listen any louder than 85db and that is loud for normal people. I have done measurements many times at my house and my average is in the neighborhood of a few watts and that was actually too loud. Most of my visitors tell me to turn it down where we can talk.
  5. I just found out the MC 2255 is a 40 year old amplifier that was sold only for a couple of years. There are always exceptions to every rule when it comes to electronics. Marketing and selling a class B amplifier to audiophiles was a hard sale even for McIntosh. I am sure it was is a fine sounding amplifier but why when an A/B is so much easier to design. I would never pay good money for a class B amplifier just because of how it operates.
  6. The notion of needing lot's of power with Klipsch is BS. Continuation of the power wars started in the 70's. I am sure this is going to start a lively conversation with lots of disagreement but the more knowledgeable members know the truth. Lots of watts with our speakers is like the little old lady in a Ferrari that never drives over 55mph. Nothing wrong with it but wasted dollars and power. Anyone smart enough to say different should be smart enough to measure the average power they are truly using a multimeter and ohms law at the loudest level they listen at.
  7. 36 years with my LaScala's bought new. Why change? Have added a sub and done some improvements.
  8. I personally like class A amplifiers whether tube or SS. Firstwatt would be my first chose. Do not let the prices scare you because they often come up for sale here and at Renohifi. Firstwatt amplifiers with 25 watts are perfect with horns.
  9. Just thought I would, any one thinking of purchasing a new amplifier for an efficient speaker like horns will be way better off thinking quality over quantity when it comes to power.
  10. I need a lot of watts for my LaScala's to wake up. At least 5 or 6 watts. 🙂
  11. I was lead astray by specs when I bought an AR3a. Klipshorns did not have very good reviews when rags were the rage. My thinking is they did not advertise enough in their publications.
  12. I do not understand why they would design a class B amplifier or what the advantage of doing so would be. Above my pay grade.
  13. Learn something new every day. Hard to figure out why when all one has to do is bias the output devices up a touch. The engineers at Mc know what they are doing. Must be the same with the Chinese built Melody's.
  14. Nelson said it best. "For years I designed amplifiers for low distortions number but now I design amplifiers that sound good to me and hope others like them as much to buy them." Or something to that effect.
  15. I've found it pleasurable using a tube pre with certain SS amplifiers but not all. It all depends on how much 2nd harmonic is built into the SS amplifier.
  16. First one for me. Possible a language problem in translation but if not they have somehow solved the problem class B has with crossover distortion. If true I would be reluctant to purchase myself. An amplifier I used for decades went into class B at high power levels but it was mainly produced for pro applications. The Crown DC300a.
  17. My kind of friend. You did not mind some piston slap when trying to set a record.
  18. I've played with different types of resistors a little bit. I really could not tell a difference. Maybe on paper but not on my ears. Carbon resistors change value with time for sure where metal film are very stable on value. It's called splitting hairs.
  19. Whoever said it was a class B amplifier is mistaken or just a slip up in his review. I know of no consumer class B amplifier being sold. Possible in pro gear where distortion is sometimes wanted, guitars. I say trust your ears more than what you read.
  20. Tubes still rule when it comes to sound. Nelson uses SS output devices that have curves like tubes. Not absolutely true but in general terms he tries to get the tube sound in a SS component. More reliability for the SS crowd. I once asked him why he did not design a tube amplifier. His response was he has designed and he does have tube amplifiers. It's just that SS is the field he has chosen as a profession. Been really successful at it as well.
  21. I like the look of a spartan built amplifier, built for sound rather then esthetics.
  22. Kt88 is an excellent tube in a properly built amplifier. I have both a SE KT88 and SE El34 amplifier. Not a lot of difference in sound but more power.
  23. No way do you want a class B amplifier. You will have terrible crossover distortion. With a properly biased A/B amplifier crossover distortion is for all practical purposes eliminated. With our speakers, being so efficient an A/B amplifier may not ever leave class A. Bias is the term you may not understand but if means if you bias, turn up, the transistor or tube as far as reasonably possible, where it will not destroy itself, it will stay in class A. Then you will have a PP class A amplifier in it's power rating. Nelson Pass wrote and articled years ago called "Leaving class A". https://www.passlabs.com/technical_article/leaving-class-a/
  24. My opinion, which is probably not worth much, is very little difference especially in a sealed enclosure. But now we have something to argue about for a few pages more. Is not that what social media forums do? I just hope we all remain friends even though there is disagreement.
  25. Years ago it was common to see drag motors tore down between races. They only wanted to have the motor last for a 1/4 mile. Now with improvements in metallurgy they try and make the motor last for 3 or four runs. They are always trying to cut weight without the part failing. One use to see many a Nascar car motor blow up on the race track. Not so much anymore. But they do still cut as much weight out of the engine on every part while still having the engine survive long enough to finish the race and not much longer. Less weight inside and motor balanced correctly enables motors to achieve higher rpms.
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