Here's a hint for dealing with assortments like this. Put values 10 meg. Then take all of the smaller bags and put them in a large bag. Much faster than just digging through values at random.
For a similar set of resistors I labeled 24 parts bins with the IEC E24 values, then I put all the 1, 10, 100, 1K, etc. into the 1 bin, the 1.1, 11, 110, 1.1K, etc. into the 1.1 bin, and so on. Then all I have to look at is the last band--the multiplier. Makes it a lot easier for my old eyes these days.
Even better. 1xxx I one bag. 2xxx in another. 3xxx in a third, etc. Also, start saving your pill bottles. And you'll find the USPS Priority Mail small boxes nice uniform containers for all your parts and they fit nicely into the USPS medium flat rate BOXES as well. In fact, you can spend the rest of your life organizing your stuff! ..I am!
5% woo! We have several Sullivan & Griffiths decade boxes from the 1950s and 1960s, untouched except for cleaning. They were bought for cheap on eBay. Some are 0.05% the others 0.1%. And they still are, even after half a century. The cleaning is necessary for reliable 0.01 Ohm steps.
Resistor power handling in still air should be dependent on convection from the surface area, assuming both resistors have the same emissivity. So it seems that either your old resistors were conservatively rated, or your new resistors won't really handle 1W for a long period of time...
Using size as a guide to power handling capabilities works only if you are comparing resistors of the same construction. The thermal resistance of the packages may be very different. The newer resistors may be more efficient in both transferring heat from the resistive material to the surface, and the surface of the component may radiate more efficiently. Consider, for example, SMT resistors. The 1-watt variety are physically much smaller than those original Allen-Bradleys. Of course, the SMT variety depend upon copper traces to help dissipate the heat, but even so the size difference is obvious.
@@tfrerich My comment was for steady state cooling by free air convection assuming radiation and conduction through the leads. For transient behavior, the construction of the resistor matters, but for steady state, all the convected heat has to pass through the surface, so if the air isn't moving, the larger the surface area, the higher the power dissipation. SMD components are very different with almost all cooling occurring by conduction through the pads.
Maybe the box had 2 Watt resistors in it as they want you to safely handle the rated 1 watt stated on the front. Hence the bigger size resistors in the original.
Now to organize all your components, do this: 1xxx I one bag. 2xxx in another. 3xxx in a third, etc. Also, start saving your pill bottles. And you'll find the USPS Priority Mail small boxes nice uniform containers for all your parts and they fit nicely into the USPS medium flat rate BOXES as well. In fact, you can spend the rest of your life organizing your stuff! ..I am!
Difference is carbon composition for the old ones, which means that every value above 1k has drifted up, sometimes badly, and everything below 1k drifted down. Replacement is carbon film which is both more stable, and likely the 5% tolerance is actually 2%, and they just run hotter than the composition, which starts to exude melted wax above 50C, and smokes at around 100% overload. I have a whole box of composition resistors, and I have learnt that you measure the value before you use them, as the 33k will generally be 40k or more, and so on up the values, and the lower values will tend to be lower than the band says, though I have a few with only a green band on them, and they are somewhere between 3R and 10R in value, though it is more like they are thermistors than resistors, in that heating them makes the value change wildly. 5R 20% tolerance is actually what they are.
Here's a hint for dealing with assortments like this. Put values 10 meg. Then take all of the smaller bags and put them in a large bag. Much faster than just digging through values at random.
For a similar set of resistors I labeled 24 parts bins with the IEC E24 values, then I put all the 1, 10, 100, 1K, etc. into the 1 bin, the 1.1, 11, 110, 1.1K, etc. into the 1.1 bin, and so on. Then all I have to look at is the last band--the multiplier. Makes it a lot easier for my old eyes these days.
Even better. 1xxx I one bag. 2xxx in another. 3xxx in a third, etc.
Also, start saving your pill bottles. And you'll find the USPS Priority Mail small boxes nice uniform containers for all your parts and they fit nicely into the USPS medium flat rate BOXES as well.
In fact, you can spend the rest of your life organizing your stuff!
..I am!
5% woo! We have several Sullivan & Griffiths decade boxes from the 1950s and 1960s, untouched except for cleaning. They were bought for cheap on eBay. Some are 0.05% the others 0.1%. And they still are, even after half a century. The cleaning is necessary for reliable 0.01 Ohm steps.
This one is more Gilbert and Sullivan
@@IMSAIGuy Excellent!
Resistor power handling in still air should be dependent on convection from the surface area, assuming both resistors have the same emissivity. So it seems that either your old resistors were conservatively rated, or your new resistors won't really handle 1W for a long period of time...
Using size as a guide to power handling capabilities works only if you are comparing resistors of the same construction. The thermal resistance of the packages may be very different. The newer resistors may be more efficient in both transferring heat from the resistive material to the surface, and the surface of the component may radiate more efficiently. Consider, for example, SMT resistors. The 1-watt variety are physically much smaller than those original Allen-Bradleys. Of course, the SMT variety depend upon copper traces to help dissipate the heat, but even so the size difference is obvious.
There's only one way to find out in this case: Test them.
@@tfrerich My comment was for steady state cooling by free air convection assuming radiation and conduction through the leads. For transient behavior, the construction of the resistor matters, but for steady state, all the convected heat has to pass through the surface, so if the air isn't moving, the larger the surface area, the higher the power dissipation. SMD components are very different with almost all cooling occurring by conduction through the pads.
@@jspencerg Yes! That would be an interesting video as well.
Maybe the box had 2 Watt resistors in it as they want you to safely handle the rated 1 watt stated on the front. Hence the bigger size resistors in the original.
My buddy bought a bag like that, and bought a bunch of envelopes, sorted and labeled it all..I have them now, and its great
Nice! I like the cable lacing too.
Did you test the ranges to see the tolerances?
The leads guage are thinner, something gotta give ?.
probably steel so stronger 😎
What an armful of carbon composition resistors that probably setteled in at +20% above labeled value.
1:25 What they're doing, is selling you 1/2 watt resistors and calling them 1 watt resistors.
Now to organize all your components, do this: 1xxx I one bag. 2xxx in another. 3xxx in a third, etc.
Also, start saving your pill bottles. And you'll find the USPS Priority Mail small boxes nice uniform containers for all your parts and they fit nicely into the USPS medium flat rate BOXES as well.
In fact, you can spend the rest of your life organizing your stuff!
..I am!
Thanks 👍
Difference is carbon composition for the old ones, which means that every value above 1k has drifted up, sometimes badly, and everything below 1k drifted down. Replacement is carbon film which is both more stable, and likely the 5% tolerance is actually 2%, and they just run hotter than the composition, which starts to exude melted wax above 50C, and smokes at around 100% overload.
I have a whole box of composition resistors, and I have learnt that you measure the value before you use them, as the 33k will generally be 40k or more, and so on up the values, and the lower values will tend to be lower than the band says, though I have a few with only a green band on them, and they are somewhere between 3R and 10R in value, though it is more like they are thermistors than resistors, in that heating them makes the value change wildly. 5R 20% tolerance is actually what they are.
Nice change from Python programming!
They’ll be like the Chinese LED floodlights - says they are 100W but only take 23W…
refinish the box? ;-) also more spongebob references please.
You are a regular soldering machine.
Why carbon resistor? Noise... Metal is better..