need these resistors please!

[mkruger]

looking for this type of standard power resistor in aluminium housing with the following values:

100K 10W
47r 10W

seem to be having trouble finding them. I'd like to find a steady supply but would settle for a few.

-mike[/img]

 

[mcs]

47R is no problem - 100k is worse.

Best regards,

Mikkel C. Simonsen

 

[mkruger]

[quote author="mcs"]47R is no problem - 100k is worse.

Best regards,

Mikkel C. Simonsen[/quote]


you have 47r 10W I could get?

 

[Marik]

[quote author="mkruger"][quote author="mcs"]47R is no problem - 100k is worse.

Best regards,

Mikkel C. Simonsen[/quote]


you have 47r 10W I could get?[/quote]

Usual suspect--Mauser. They don't have 100K, though.

http://www.mouser.com/catalog/619/397.pdf

 

[neilium]

http://www.surplussales.com/Resistors/WireWound/WW30k-100m.html

Nebraska Surplus has some 100k 15w resistors. I doubt they are the same as the nicely housed one in your photo, but they will work.

-Neil

 

[mcs]

[quote author="mkruger"]you have 47r 10W I could get?[/quote]
No, but they are available from Farnell, RS and Elfa here, so they can't be too difficult to get in the US.

Best regards,

Mikkel C. Simonsen

 

[zebra50]

Are you sure you need 10W 100K? What's it for?

V = IR, I = V/R

W = I^2 R, W = V^2/R

W = 10, R = 100,000

so 10 = V^2 / 100,000

V2 = 1,000,000

So V = 1000V


(someone please check my maths for cock-ups!)

 

[mkruger]

the 100K 10W along with a 10K 10W is for the B+ 320V power supply of a tube mic pre to create a floating ground of 30V for the K+ 12VDC tube heater power supply. yes, no?

 

[NewYorkDave]

Remember that your voltage divider is just providing a reference voltage for your heater supply; the tubes aren't drawing heater current through it.

The upper resistor in the voltage divider needs to drop
320 - 30 = 290V

Ohm's law sez:

P = Vsq / R = 84100 / 100000 = 0.841 watt.

Use a 2-watt resistor.

 

[mkruger]

ahhh! yeah...

 

[neilium]

Also, with the voltage divider network in place, I don't think you need the bleeder resistors (R14, 15, and 17).