Inventory is very large. How many LU 1014 do Greedy Boyz want?Yes, that is do-able. I will check my inventory, I had considered a DIY F3 type of essentials kit for the store, but I probably have much more than needed for that.
Thank you Nelson, very generous. I will let the more active members coordinate numbers. I'm planning an F3 build and maybe another amp or 4..TBD. 😆
Cheers
Cheers
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Add a good pair of tweezers, solder paste, a $30-40 toaster oven, and a $50 thermocouple thermometer and you can do your own SMD reflow. 63/37 Sn/Pb solder paste is available from Digikey/Mouser/et al. Solder paste stencils are available from OSH Stencils for cheap.
Right.... Because the manufacturers should cater to the hobbyist who buys ten parts per year and not to Apple who buys ten million parts per year.
Tom
I'm in! whatever it is. I been wanting them for at least 2 project amps. Maybe this is kick in the pants to begin yet
another amp.....just what I need! Seriously, for F3 and that SE amp X outlined in the other forum.
Russellc
another amp.....just what I need! Seriously, for F3 and that SE amp X outlined in the other forum.
Russellc
^ You stated that, "any technology which has proven itself to work, should be continued for customers who want to continue using it."
So, exactly what did you mean, if you didn't intend for your statement to apply to relatively small quantities of obsolete technology that some customers still want to use? Perhaps explain how you meant for your statement to be applied to this overall situation. IMO, you'd have a bad business model if you followed that logic and your goal was profit.
If I'm understanding you correctly, I disagree with your premise and also that it's "simple" economics. However, with further explanation, I could be swayed if I either misunderstood you completely and/or you added clarification to your intention.
So, exactly what did you mean, if you didn't intend for your statement to apply to relatively small quantities of obsolete technology that some customers still want to use? Perhaps explain how you meant for your statement to be applied to this overall situation. IMO, you'd have a bad business model if you followed that logic and your goal was profit.
If I'm understanding you correctly, I disagree with your premise and also that it's "simple" economics. However, with further explanation, I could be swayed if I either misunderstood you completely and/or you added clarification to your intention.
To ItsAllInMyHead:
Please, DO NOT mudsling and let us keep the conversation civilly correct.
There is nothing more to explain, my post is straight forward and easy to understand. Furthermore, I am in NO POSITION to FORCE manufacturers to continue producing anything they decide not to, WHATEVER their motives might be.
I only expressed my frustration: democracy gives me that right, and I used it.
Please, DO NOT mudsling and let us keep the conversation civilly correct.
There is nothing more to explain, my post is straight forward and easy to understand. Furthermore, I am in NO POSITION to FORCE manufacturers to continue producing anything they decide not to, WHATEVER their motives might be.
I only expressed my frustration: democracy gives me that right, and I used it.
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I am not sure why you've stated to not mudsling and to embrace civility, but I agree and hope others will do so also. I hope I've demonstrated exactly that. If not, please show an example.
So are you clarifying that you did not mean what you wrote, that it has nothing to do with "simple economics", and that you were simply expressing a personal frustration through irony / satire? I admit to not picking up those clues. If so, enough said. It's likely many people agree with your frustrations.
No, you are in no position to force anyone to do much, I agree. I simply copied what you wrote. You stated that companies should do something, and that to do so is simple economics. I disagreed with what you wrote. I also asked you to clarify your position in the hope of either learning what you actually meant if I misunderstood and/ior finding common ground.
I think something more akin to "I don't like SMD, and I wish more companies would still sell through-hole parts I like." may have been closer to what seems to be your real point. If so, then I now both understand, and agree.
Enjoy your day.
So are you clarifying that you did not mean what you wrote, that it has nothing to do with "simple economics", and that you were simply expressing a personal frustration through irony / satire? I admit to not picking up those clues. If so, enough said. It's likely many people agree with your frustrations.
No, you are in no position to force anyone to do much, I agree. I simply copied what you wrote. You stated that companies should do something, and that to do so is simple economics. I disagreed with what you wrote. I also asked you to clarify your position in the hope of either learning what you actually meant if I misunderstood and/ior finding common ground.
I think something more akin to "I don't like SMD, and I wish more companies would still sell through-hole parts I like." may have been closer to what seems to be your real point. If so, then I now both understand, and agree.
Enjoy your day.
How did you figure the "specific Source resistor for lowest distortion"? Is this calculated, or measured?
The selection of the source resistor is discussed on page 9 of ZV9 article:
https://firstwatt.com/pdf/art_zv9.pdf
https://firstwatt.com/pdf/art_zv9.pdf
A plot of best distortion vs Source resistor was developed for a population of Jfets by pulling together measured Vgs under static DC conditions and the Source resistance which gave the best results. Given that known resistor, all you need to do is adjust the Gate bias voltage in the channel while measuring the distortion. This resulted in some very nice .00X% numbers for a very simple topology.
If anybody is seriously consider organizing a large quantity of LU1014 (based on NP’s abundant generosity 🙂), I would consider looking at this GB that WG45 and Woofertester organized last time around. It was well organized and well executed.
Along with large batch testing/matching, it also produced several good ideas (and boards) for dealing with mounting and dissipation.
Along with large batch testing/matching, it also produced several good ideas (and boards) for dealing with mounting and dissipation.
Sorry for the delay responding, the first two paragraphs of ZV9 highly recommend reading ZV8 first. Then, installment 4 recommends ZV4 reading to cover ALEPH CCS. I've read all three only once, so far so good, a couple more times will help. R3 does not seem impossible to me, however, is there a finer detail graph available or is the 5 ohm power pot the best way?
I have REW, 8 ohm load during the test I presume.
I'll take 2, I can do this. I'm slower than most, since this is a winter hobby for me. Power supply sounds costly with 50v rails, I even have 9.09K resistors from another project.
I just searched epray for 2sk182 and 2sk183, the 1000W white cylindrical ceramic SIT variety. Seems a couple of seller in the good US of A have a (very) few to sell.
I just (re) stumbled on these catalog sheets from Tokin, I thought it might give some of us scroungers a place to start looking for equipment using SITs.
cheers
PS, I just pulled apart my last hope for SITs, a 6KW wind inverter from Power One, about 2009, it has very large(r) than TO-247 in it, but the part numbers have been sanded off. 🙁 As the inverter may still work, I don't want to dismantle on a chance they are SITs.
cheers
PS, I just pulled apart my last hope for SITs, a 6KW wind inverter from Power One, about 2009, it has very large(r) than TO-247 in it, but the part numbers have been sanded off. 🙁 As the inverter may still work, I don't want to dismantle on a chance they are SITs.
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I have bought parts that test as NPN (comupterized tester) but sold as SIT (THF51). (Or they are thyroids
)