I think you took my original statement wrong. I said “likely” not great based on experience with other complex Japanese designs which fell flat, and i leane don the opion of a number of members who have WAY more electronics knowledge than me.
I could design a simple tube amplifier but those 3 legged fuses largely baffle me. i’m a speaker hguy but i have heard and used an awful lot of amplifiers.
I do have Nelson’s SIT3, and his VFET, and they are both VERY good.
I could have googled earlier, it was this one with the matching pre-amp
dave
Better not or the pcb will heat up even more.
Oh... you mean to prevent the heat from interacting with the pcb?
It's a bit cramped there... it will block the air flow, and the V-fets will run hot.
Addition to #59:
...so during use warming up and cooling down after switching off -> thermal stress is apparant.
(typo's and composing/translating/editing issues)
I looked into the structure of 4650 and 5650, seems 4650 lacks of the air duct? You can try to fabricate one and add in there. The duct makes air moving faster.
there is a paintable"air gel" heat isolation material you can brush inside or out side of the air duct, stop it being a heating element for the pcb. 1 mm thick or that material equals 10mm of Pu foam, non flamable.
there is a paintable"air gel" heat isolation material you can brush inside or out side of the air duct, stop it being a heating element for the pcb. 1 mm thick or that material equals 10mm of Pu foam, non flamable.
I have recently finished few projects with monsoon planars. Ok sound. But not even close to big heil amt tweeter. Easily crossed at 800Hz in 2way.
https://essspeakers.store/products/amt-limited-edition-pair
Your car audio planar will have no chance against big heil. But your car planar is 10x cheaper. That should tell you something. Just because it can work as headphone, does not mean it will work great as speaker.
https://www.diyaudio.com/community/threads/monsoon-speaker-parts.391848/page-3
then you would like the B-2 that you have in the photo as well, given that it worked like new or better, which is possible these days.
I have the SIT3 and I love that amp too.
I appreciated your recommendation.
Your project is really badass but I am not ready to try that sophisticated system for now
Working great as headphone means very accurate small vibration reproduction capability to me all I have to do is choose how many to use together to remain in the x-linear range. I thought they might be better if applicate well. What I want to build is strictly to 2 way speaker right now. The speaker's frequent response only tells half of the story, as the response is cumulative. A speaker could be have good amount of vibration by many repeated excitations after excitations and stops like stoooooooooop, B speaker could be like achieve the max vibration by two or three strike, and stoped right there after the input energy stopped. A and B could be Identical in frequency response.
What I love is well controlled vibration, the planar is simply the best for current technology for me through educated guess and my experience in hi-end dynamic, electrostatic and planer headphones. The planar speaker's low-frequency vibration is damped by the air "leak" of the material glued on the back plate. The stretch of the membrane defined k as a spring. Whereas in high-frequency things are different, the damping is mainly provided by radiating the energy out, just like radio wave. What is the best is you have less energy stored in whatever things are radiating energy. So I think the lightest weight stores the least energy for it to be underdamped, and the BL factor is important too, It works just like an electric motor, the membrane should be accerated fast enough and stopped fast enough to be well controlled. So, the planer is lighter than AMT and the dynamic driver for the same amount of air can be radiated. The electrostatic ones are light too, but the motor force is much weaker, and the robustness is inferior. What's more, the whole membrane should be in phase that's where the dynamic driver lose as well, (AMTs are not in phase at all). These are reasons I love planar speakers.
But the most fun thing comes to the possibility of building a top-tier thing with some cheap underdogs, can't wait to try, no matter if it will succeed or not.
No need for a duct because there are only four V-fets and the heat sink is higher (same footprint though).
I notice that there are two branches in this topic deviating somewhat from the OP's question, this one included.
Let's bend a bit back again!
https://nationaltoday.com/random-act-kindness-day/
Last edited by a moderator:
What's that random act of kindness day thing? I tried to act kindness everyday, oh at least to my cat.
Ok so, What I can pursuit to get a better amp???
Ok so, What I can pursuit to get a better amp???
The amplifier you're happy with.
With all respect, some prefer high accuracy (high open loop amplification and high feedback) presenting the recording in the living (listening) room. Others prefer nice sound that mimics the reality (Hiraga, Pass, tubes, low open loop and low feedback), anything in between and everything in the open. Lots of discussions on diyAudio and beyond. Everyone has their own opinion and nobody is absolutely right.
What is the most liking to your taste? That's the one... to live and be happy with.
Or ask your cat, it's like a sphinx. Play recordings or birds through different amps and observe where the cat starts climbing the speakers.
With all respect, some prefer high accuracy (high open loop amplification and high feedback) presenting the recording in the living (listening) room. Others prefer nice sound that mimics the reality (Hiraga, Pass, tubes, low open loop and low feedback), anything in between and everything in the open. Lots of discussions on diyAudio and beyond. Everyone has their own opinion and nobody is absolutely right.
What is the most liking to your taste? That's the one... to live and be happy with.
Or ask your cat, it's like a sphinx. Play recordings or birds through different amps and observe where the cat starts climbing the speakers.
"The amplifier you're happy with.
With all respect, some prefer high accuracy (high open loop amplification and high feedback) presenting the recording in the living (listening) room. Others prefer nice sound that mimics the reality (Hiraga, Pass, tubes, low open loop and low feedback), anything in between and everything in the open. Lots of discussions on diyAudio and beyond. Everyone has their own opinion and nobody is absolutely right.
What is the most liking to your taste? That's the one... to live and be happy with.
Or ask your cat, it's like a sphinx. Play recordings or birds through different amps and observe where the cat starts climbing the speakers."
Maybe, it is a misunderstanding. These two categories are "highly complex circuits with many components" and "low-complexity circuits with few components". With knowledge of the "noise modulation" of the signal by each component, there is another conclusive one: the highly inaccurate, high noise and the highly accurate, low noise. Unfortunately at present not simply seek-measurable, but just highly audible-measurable;-)
Not THD, TMD, others are relevantly sound-decisive but all noise modulations by the components.
With all respect, some prefer high accuracy (high open loop amplification and high feedback) presenting the recording in the living (listening) room. Others prefer nice sound that mimics the reality (Hiraga, Pass, tubes, low open loop and low feedback), anything in between and everything in the open. Lots of discussions on diyAudio and beyond. Everyone has their own opinion and nobody is absolutely right.
What is the most liking to your taste? That's the one... to live and be happy with.
Or ask your cat, it's like a sphinx. Play recordings or birds through different amps and observe where the cat starts climbing the speakers."
Maybe, it is a misunderstanding. These two categories are "highly complex circuits with many components" and "low-complexity circuits with few components". With knowledge of the "noise modulation" of the signal by each component, there is another conclusive one: the highly inaccurate, high noise and the highly accurate, low noise. Unfortunately at present not simply seek-measurable, but just highly audible-measurable;-)
Not THD, TMD, others are relevantly sound-decisive but all noise modulations by the components.
I want to try to get an schematic for sansui ba-1000 and try to upgrade the caps and resistor to modern ones, but before that how can I record the baseline of current state of the amp？ Record a video/audio? Measure THD TMD ?
With today's technology, it is not difficult nor expensive to measure some of an amplifier's performance parameters. See this thread:
https://www.diyaudio.com/community/threads/how-to-distortion-measurements-with-rew.338511/
You can make before and after measurements and compare.
https://www.diyaudio.com/community/threads/how-to-distortion-measurements-with-rew.338511/
You can make before and after measurements and compare.
Thanks pinholer, but it is a 600+ contributions topic. You want me to read all or can you give us a short & concise fold up?
Thanks, learning, but I don't think ordinary measurements qualifies sound very well, Human perception in sound is very tolerant in some aspect and very sensitive in other aspect, otherwise I wouldn't tell where a screw drops on the floor. I wonder how 5 centimeters different looks on measurements. I studied a little about pulse response of human ears. Ears, eyes, are truly beautiful high performance sensors.
there might be ways to display such difference in measurements I haven't studied but just as impulse responce, how can one interpret the results as better or worse? Might be that impulse response is important as well for an amp.
there might be ways to display such difference in measurements I haven't studied but just as impulse responce, how can one interpret the results as better or worse? Might be that impulse response is important as well for an amp.
I think most people would agree that some properties such as frequency response, distortion, and noise are indicators of quality. These all can be measured easily with a computer/soundcard and software. An FFT measurement of an amplifier's response reproducing a 1 kHz can show harmonics produced by the amplifier as well as noise from the power supply. Measurements at various output levels can be used to show the resulting distortion.
Instead of just measuring Total Harmonic Distortion, the levels of each harmonic can be determined. With this data, it is possible to adjust the amplifier to the distortion profile that you prefer. Some people like 2nd order harmonics.
For the price of a sound card ($100 - $200), the ability to do these measurements is a bargain. As you said, human perception is complicated. Measurements are repeatable.
Instead of just measuring Total Harmonic Distortion, the levels of each harmonic can be determined. With this data, it is possible to adjust the amplifier to the distortion profile that you prefer. Some people like 2nd order harmonics.
For the price of a sound card ($100 - $200), the ability to do these measurements is a bargain. As you said, human perception is complicated. Measurements are repeatable.