3W resistors

[altec9440]

hello

look for decent (best?) power resistor for quad405 amplifier. In final stage, I need 0R1 and 560R.
What do you think of Omnite WN serie ?

http://www.farnell.com/datasheets/1928684.pdf

thanks

 

[coolnose]

AFAIK wirewound are NOT suggested in output stages, 3W metal oxyde or metal film are most builders choice.

 

[JonSnell Electronic]

Through Hole Fixed Resistors
Through Hole Fixed Resistors
Plenty of choice here.
R14 is a half Watt!

 

[chris719]

AFAIK wirewound are NOT suggested in output stages, 3W metal oxyde or metal film are most builders choice.

As long as they are the WN, these should be fine. They are wound Ayrton Perry style and specified at < 1 nH @ 1 MHz according to the datasheet. Generic wirewound, I agree you have to be careful.

 

[altec9440]

AFAIK wirewound are NOT suggested in output stages, 3W metal oxyde or metal film are most builders choice.

Is it only for inductive point of view or others factors must be considered ?

 

[jackinnj]

Panasonic ECG are inexpensive, readily available from DK. Nelson uses them.

 

[chris719]

Is it only for inductive point of view or others factors must be considered ?

Wirewound typically have excellent specs other than inductance.

 

[altec9440]

Happy new year

I found this article :
Wirewound vs. Film Resistors for Precision Applications

I also found this interesting analysis
UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Metal oxide film versus wire wound resistors

 

[JonSnell Electronic]

So ... what is wrong with replacing the originals with wire wound, that is what was fitted in the first place.
Never replace components unless they are faulty!

 

[Mark Tillotson]

Low value wire-wound resistors naturally use a short winding of thick wire, so not many turns and not too inductive. Higher value wire-would need longer thinner wire and thus will have more turns and more inductance. There aren't that many metals available as resistance wire (manganin, nichrome, etc) so the geometry is the way resistance is tuned, and geometry is of course the determiner of inductance.



I would expect a 0.1ohm emitter resistor to be very low inductance, even helically wound. I've some 2W 0.22ohm WW in front of me, about 6 turns are visible.