Got a link to examples, datasheet, manufacturer? Sure these aren't metal oxide? I don't recall ever seeing a composition housed in anything other than phenolic.
Check out the Erie Resistor Co. Carbon composition resistors were once mandatory in R.F. circuits as the inductance was low,however this form of tubular construction has disappeared after the introduction of conformal and other insulating coatings.
Here is KOA Speer's catalog page off of Mouser's website. They're not the only guys making these, though, so apparently this is a thing: I've also attached two more datasheets, one from Ohmite, one from Tyco.
It's a leaded resistor, and it appears to contain a ceramic rod with electrodes on either end, like the name implies.
Apparently they're used in applications where something needs to shore up an energy spike - the ohmite datasheet claims pulse resistance of something like 15kv on resistors rated for at most two watts.
Remains to be seen whether or not they sound good. I assume whatever applications they'd have would be either tube related or in the power supply. I'm still into buying the $0.32 resistors by the thousands so you get the quantity discounts, so the economics of these still don't make sense to me yet. I am intrigued, though.
It's a leaded resistor, and it appears to contain a ceramic rod with electrodes on either end, like the name implies.
Apparently they're used in applications where something needs to shore up an energy spike - the ohmite datasheet claims pulse resistance of something like 15kv on resistors rated for at most two watts.
Remains to be seen whether or not they sound good. I assume whatever applications they'd have would be either tube related or in the power supply. I'm still into buying the $0.32 resistors by the thousands so you get the quantity discounts, so the economics of these still don't make sense to me yet. I am intrigued, though.
Terrible temperature coefficients! They appear intended for high pulse endurance performance that exceed carbon composition, but are not otherwise a highly linear part for audio as metal film (and wirewound) types are.
The real test would be obtaining a few and see what effect they have in an application.
The real test would be obtaining a few and see what effect they have in an application.
I think this may require some experimentation. I assume the noise levels would probably be quite high since all they needed the thing to do was absorb pulses and who cares about a few microvolts here or there added to a couple kilovolts? We really don't know very much about the composition from the manufacturer's literature, though, do we? Until I know more about what's actually inside these things, much of this talk will remain speculation wrapped in a fig leaf. I'm going to email KOA Speer for more information.
Carbon comp were at one time the standard run-of-the-mill resistor type. They were largely replaced by film resistors, which are much better in almost every respect than one: overload behaviour. CC resistors can cope with a temporary overload much better than film resistors. For this reason CC were still made for special purposes where overload is possible. CC still had their downside: high noise, poor long-term stability, voltage non-linearity. For some strange reason some people actually preferred CC 'sound'. The low inductance of CC is only relevant to people making DIY UHF radio equipment; nothing to do with audio.
Now if these new 'ceramic' resistors can replace (or exceed) CC in overload capability then CC can be pensioned off. Like CC, there is no reason to use 'ceramic' resistors in audio.
Now if these new 'ceramic' resistors can replace (or exceed) CC in overload capability then CC can be pensioned off. Like CC, there is no reason to use 'ceramic' resistors in audio.
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