Looking for 30k 10 Watts and 2.7K 10 watts power resistor (Ceramic wirewound)

[jalexquijano]

Still searching for 30k 10Watts and 2.7k 10 watts ceramic wirewound resistors. The ones that Mouser sells are tubular.

https://www.mouser.com/ProductDetail...Ml2IT%2f5Tc%3d

[glebert]

Are you looking for rectangular?

[Chuck H]

If by ceramic you mean the "cement block" type, Mouser has a 33k 7W and a 30k 15W. Not close enough? Is there no leeway in the design such that it must be a rectangular profile, 30k and 10W only? I didn't look for the 2.7k.

[Enzo]

The round one you linked was not stocked and has a 250 piece minimum. But otherwise, what would be wrong with a round one? They do have three different similarly shaped ones.

The 30k 15w part Chuck mentions is a rectangular one.

They do have a 2.7k 10w, which is also round.

The circuit doesn't care about the shape.

[jalexquijano]

Mine is working at the moment. I just replaced the 2.7k 10 watts due to deterioration. Any issues on using a 33k 10 watts instead of the 30k 10 watts in case i dont fine a rectangular one?

[Chuck H]

The 33k rectangular resistor I found at Mouser was a 7W component. Knowing if this is ok is a matter of circuit analysis. 33k as it relates to a desired value of 30k would correspond to a 10% tolerance spec. That's pretty typical. Most new components are very close to spec. so it's likely that is you order a 33k resistor it will be 33k, or, at the high end near 10% spec. of the desired value. Again, knowing if this is acceptable requires circuit analysis.

Using the 15W 30k resistor make it a no brainer. It's on spec for value and it's rated 5W over spec for power. And it's rectangular

[jalexquijano]

I want a 30k 10 watts rectangular. Wouldnt like to mess with the values.

[pdf64]

Is this for the HT potential divider of a late 70s Fender preamp supply? They usually run rather hot and eventually fail. The same preamp HT can usually be approximated with a regular 10k dropper.

[g1]

pdf it's the red knob "The Twin", with the 30K10W acting as a ballast from node A to ground.

[Chuck H]

pdf it's the red knob "The Twin", with the 30K10W acting as a ballast from node A to ground.

Then I'd REALLY like to hear what the reason is for not choosing the 15W resistor. I wondered about it above and I'll say it plain now. Why must it be 30k, 10W rectangular? There is absolutely NO mojo with that component and none I've ever heard about from that amp. Further, that resistor isn't even in the signal chain where most mojo hunters live. Seriously, just use the 15W resistor. Though it might be even better to use a higher voltage rated resistor (regardless of it's shape) since those block resistors don't usually have high voltage specs.

[J M Fahey]

I want a 30k 10 watts rectangular. Wouldnt like to mess with the values.

Using the 15W 30k resistor make it a no brainer. It's on spec for value and it's rated 5W over spec for power. And it's rectangular

So you are NOT messing with the value and installing a better part to boot.

In any case I am not sure *why* you are trying to replace it.

397V across a 30k resistor means 5.25W dissipation so any and all the suggestions above (even the 7W one ) will work very well there.
Round Vs rectanguklar?: not an issue, changes nothing.

[Jazz P Bass]

And the 15 watter will get hot too.

I believe the OP thinks a higher wattage resistor will run cooler.
Not gonna happen.

[Chuck H]

And the 15 watter will get hot too.

I believe the OP thinks a higher wattage resistor will run cooler.
Not gonna happen.

Actually it may. Depending on it's construction. It will NOT, however, produce less heat. The amount of watts dissipated in the resistor end up as heat. So a physically larger resistor may indeed run cooler because there is more surface area for the same amount of heat. Inside a closed chassis it makes no difference.

[jalexquijano]

Just tell me where i can get a rectangular 30k 10 watt ceramic wirewound resistor. Which supplier?

[Enzo]

To sum up the answers:

We don't see specifially a 30k 10w rectangular resistor from our suppliers.

What we do see is 33k 15w in a rectangular part. A 15w compared to 10w will work exactly the same, but will be a little longer physically.

We do see 30k 10w resistors that are cylindrical. Electrically they are identical to rectangular ones, they just appear a little different.