I will one day have a play with a strain gauge cartridge for giggles and because the preamp is simple. But a real intrigue for me is how much it would cost to re-engineer the coils for old victor MC series cartridges. From what I can tell they were made on some form of IC litho process with each coil being about 1mm square. Sadly most of the victor cartridges made have suffered coil failure and no one has yet made a replacement part (unsuprisingly).
I suspect/fear setup costs for replacements would run some 10s of k...
^ It's amazing what you can do nowadays with micromachining rather than through litho if this is a truly one-off project. Still a ton of development work to do.
*You can get mylar transparencies with 5 um minimum feature size that will show up when using contact mode on a Suss MJB4 (ubiquitous). Gotta find a uni lab that can help you out.
*You can get mylar transparencies with 5 um minimum feature size that will show up when using contact mode on a Suss MJB4 (ubiquitous). Gotta find a uni lab that can help you out.
By the way ...
I have just bought your kx-Amplifier PCB, I look forward to try it.
Although I prefer vacuum tubes over BJTs and mosfets your design looks nice for me since I can use it in class A to drive my 97 dB OB (2 x AE LO15 + Supravox 165 GMF + ESS Great Heil).
Just a little question: have you ever tried inductive PSU filtering instead of capacitive in class A operation?
Finally, since you have designed such an amplifier I wonder why you write on this thread of measurement fanatics who listen to measurements rather than to music, those who uses tons of feedback in phono preamp to get several zeros before the first significant digit of the THD.
It's a mistery to me.
But as well known I'm very limited, sorry.
And in a related story, mold makers are some amazing people! In the optical disc industry we have molds with moveable vent rings around the circumference of the fixed side mirror. The mirror forms the bottom surface of the CD, and the vent ring forms the outside edge. These rings have to be independently spring loaded to seal against the data stamper yet are closely mated around the mirror with less than a micron clearance in a 120 mm diameter. It has to be this tight to ensure that no plastic will be flashed when injected and held with 15 klbs of pressure.
These moving parts seal without seizing even as the temperature of the mold parts cycles with each disc and in the presence of molten polycarbonate exudate...for hundreds of thousands of discs. It apparently takes weeks to make these parts with extremely gradual grinding and relaxing cycles...
I doff my hat to these folks!
Howie
p.s. for anyone interested in technical archaeology: How It's Made: Compact Discs - YouTube
I don't think you grasp the point, or lack thereof, of this thread.
A better question is why you're here this if is a den of measurement fanatics?
Thanks for the feedback. I’ve never tried inductive filtering, although quite a few folks swear by it. You could try it with the kx.
There is a cap multiplier (aka ripple eater) board available for the kx and sx Amps. Details on hifisonix page.
Re measurements and listening- I took the decision a while back to steer clear, in general, from this discussion. There are no winners.
Thanks for the feedback. I’ve never tried inductive filtering, although quite a few folks swear by it. You could try it with the kx.
There is a cap multiplier (aka ripple eater) board available for the kx and sx Amps. Details on hifisonix page.
Re measurements and listening- I took the decision a while back to steer clear, in general, from this discussion. There are no winners.
I also ordered your capacitor multiplier board, thanks for the hint.
I understand your decision, it is definitely the wisest, although I am very intrigued by how one can listen to a piano with an AP tool.
You mean Tesla have finally employed some people that know how to build cars? After the complete mess some of the bodywork was on the model 3 looks like they are finally learning.
They need to remind folks that someone needs to be in the drivers seat. I thought only cars full of gas smoked like this.
‘No one was driving the car’: 2 men dead after fiery Tesla crash in Spring, officials say
‘No one was driving the car’: 2 men dead after fiery Tesla crash in Spring, officials say
I thought your ride at BA was perfect. To be honest I'm no fan of Mr. M in fact I love Thunderf00t (without the feminism stuff). The Hyperloop: BUSTED! - YouTube
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Scott, tragic to see any form of vehicle related injury or death. I've been
in a few close calls, the worst being a triple roll, none of which I was driving.
By any current measure Tesla are the safest cars on the road and have achieved the lowest probability of injury of any car ever tested.
WRT vehicle fires, I think they are about 1/10th the national average /
million miles traveled.
You can't argue with stats but if one Tesla burns, it will be all over the media,
100's of ICE cars burn - who cares... click bait is king.
That's the way it rolls for them, always has been, one small part of
resistance to disruptive change.
TCD
OK Bill... I'll resist the temptation to pull out some Lucas electric or Brit car jokes
What was that high rating Brit car show who tested the original T Roadster where it broke down? Clark Sun didn't look surprised because it was written
into the script. Tesla lost a lot of money through that but it was just the start of a trend - massive resistance on all fronts to their very existence.
Billions of 'shorts' from major investors waiting for their desecration. Musk put every cent he had left into M3 production ramp and apparently slept on the factory floor for months to get things going.
FF to 2020, VW are holding an inside meeting of execs called 'Mission T'. The topic - 'What do we have to do to catch up to Tesla'?
Yep, I think they are starting to work out how to make cars.
TCD
OK Bill... I'll resist the temptation to pull out some Lucas electric or Brit car jokes
Tesla Model 3 Built Like A 1990s Kia, Says Engineering Firm
In the 70s most cars were rubbish in some way or another until the Japanese started to show the way. But in the 21st century no excuse. The recent flash memory issue is a classic. Anyone who has worked supplying automotive OEMs knows that reliability is queen (after cost which is king) and ther OEMs want to have their cake and eating it. designing a critical system where the flash wears out after a couple of years is a silly oversight. If Musk wasn't such an egotistical motormouth I might cut him some slack.
As for fires a gasoline fire generally burns out after a while. Teslas re-ignite days later!!!
Yes. Tesla has screwed up the basics here and there, but that's the easy part that will improve with time. The hard part is what they are good at.
I certainly think it's easier for Tesla to figure out how to improve assembly and DFM rather than VW, Toyota, etc. learning to design good software and integrate systems they normally outsource to suppliers.