Resistor identification...Mallory MOL

[KL7OF]

I acquired a supply of Mallory MOL resistors in 2 watt and 3 watt ratings..My question is ..Are these resistors non inductive?   Can they be used in a non inductive application where carbons are called for such as a Parasitic choke or beverage antenna termination?   I broke one open and they are ceramic..no wire windings.... Pictures attached...Thanks, Steve

[WA1GFZ]

look closely at the ceramic. I see circular deposits on the ceramic which means it will have a bit of inductance. less than a wire wound though

[KL7OF]

There is a spiral groove impressed in the cermic material...The green outer coating must be the conductive/resistive material?..I wonder if the groove is there to aid the resistive qualities or just for traction for the green stuff to bond to the ceramic core...

[WA1GFZ]

I suspect to increase the length of th econductor deposited on the ceramic. Many times this is laser trimmed.

[WA1HZK]

Find someone with an inductance bridge & hang on across it.

[VE7 Kilohertz]

Hi Steve,

A web search revealed this on ebay. Don't know where this guy got his info but you never know, He calls them wire wound. Sometimes, you can cancel the inductance if you put 2 of them in parallel but in opposite directions (need to double the value of each). Depends on how they are wound.

Cheers

Paul

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=4664&item=2543230806

[KL7OF]

I found that these MOL resistors are a ceramic form coated with a carbon (paste?) layer and then sealed with the outside (green) coating....I dont think they are inductive however I am borrowing a "Almost all digital Inductance meter" for testing...

    Also, I was checking to see if some of my Brown Carbon resistors were really carbons.....They are...