Dear sir you were talking about valve tubes & others amplifier designs that i cannot understand. I dont have any knowledge about valve tubes. So i did not post any comment here. But you may continue your discussion.
Last edited:
I agree you can explain and share your ideas with us we will like to see your ideas.
According to experts tubes have soft clipping. When no clipping occurs, they sound in the same way as transistors.
Tubes have higher thd than transistors but tubes sounds good as compare to the transistors.
Why do you care so much? maybe it has commercial value?
you “talk” about this, I use it, so I give it as an example in the dialogue, the technique is easy to understand, and this is not the option that you use in your amplifiers. If it is not clear, re-read my posts above again, but this is not necessary.
very good, I try not to interfere if a person is doing something and the scheme has no obvious contradictions
I spoke about lamps only in the context of test comparisons, because there were many of them and there was a corresponding laboratory and even an anechoic chamber, although it turned out to be useless in tests.
Not for everyone and not always, for more than 10 years of blind test comparisons, the tube amplifier of the amateur radio assembly has not received first place. It is much easier to make a high-quality transistor amplifier with basic amateur radio skills.
They "aced" it then. There has been no real advancements in AB topology in 50 years. "Lin' topology was 1972. Japanese refined it through the 80"s.
All we do here is apply what has already been done to modern devices and hope for PPM.
Your point ?? Where is your 21'st century breakthrough ?
Pass , Curl .... just cult followings redoing what was already done by trial and error in the 80's by Japanese EE's.
"21st century" - WHAT ? ... class D ?? Emotiva and many others say "amp is lighter - new tech" Just an excuse to increase profit margin and
be able to outsource to Asia.
Also , if any particular topology can hit 20Khz PPM performance with less NFB , great ! Some "audiophools" prefer NO feedback designs -
say they sound "better" ?? Or class A .... heat the room up - definitly not "green".
Most any classic design with any (reasonable) amount of NFB drops down to 20-30PPM 20Khz THD. Going "deep NFB" just gives the diminishing returns of single digit PPM. You will never hear that difference.
Same old stuff , no real advancement ... "High end" is a delusion , subjective at best.
Ease of sourcing , stability , price . There are more important criteria.
I have no aversion to SMPS supplies for class AB , these tend to improve performance , cost less.
OS
progress is happening, you yourself are using generally very high-quality solutions.
Sorry, "Lin' topology was 1956
@Zohaib Ahmad
Have you done any changes to this amplifier in your first post?
https://www.diyaudio.com/community/attachments/100-watt-png.1272367/
Have you done any changes to this amplifier in your first post?
https://www.diyaudio.com/community/attachments/100-watt-png.1272367/
These were Americans and British. The Japanese were only engaged in manufacturing.
Sir can you kindly explain in details. What is progressive correction compensation?
We have digressed into semantics.
Yes , just review all those wonderful classic Japanese designs from the 80's. They "aced" it way back then.
We DO have better parts now !!
OS
only basic 3 points:
1. maximum linear gain open loop of each stage, especially the input stages.
2. compensation outside the feedback circuits, local frequency feedback is also not suitable
3. the most linear output power cascade - as a rule, this is the Lokanti cascade.
We are not considering the remaining points regarding thermal stability and a stable operating point.
not to go too deep into the topic
Last edited:
Better parts. I pick and choose those 80's "solutions" and apply them to 21'st century devices.
OS
Dear line up sir.
Wg-ski sir said me to post the pdf file of amplifier in the thread. He said that he will modify the schematic.
You can do this well, but an NFB depth that exceeds 100 dB at a frequency of 20 kHz will not work with these circuits.
lokanti cascade, progressive correction, ultra deep nfb
I don't believe a word you say 🤣
I don't believe a word you say 🤣