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Old 15th April 2013, 04:19 AM   #1
skipper is offline skipper  United States
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Default Kiwame carbon resistors

Hi All,

I have been having a tough time finding a vendor for Kiwame carbon film resistors. Can someone direct me to a vendor?

Thanks,
Skipper
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Old 15th April 2013, 04:32 AM   #2
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kiwame resistor page

UK based.
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Old 15th April 2013, 04:33 AM   #3
JLH is offline JLH  United States
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I can recommend looking at the KOA Speer SPR series of carbon film resistors. IMO they are as good, if not better. Mouser Electronics carries them.

SPR | KOA Speer Electronics
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Old 15th April 2013, 05:36 AM   #4
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Michael Percy Audio lists them. Usually maintains good stock.
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Old 15th April 2013, 06:07 AM   #5
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Some time ago, there was a flurry of posts over on AA and, perhaps, here too about Kiwame resistors being, in fact, KOA-Speer. KOA-Speer is better, because they cost less. Why pay for a label?
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Old 15th April 2013, 03:14 PM   #6
skipper is offline skipper  United States
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Thanks all, I will look into these sources.
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Old 3rd May 2013, 04:18 AM   #7
skipper is offline skipper  United States
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OK guys another question. I am wanting these carbon film resistors because I am building a cathode resistor selector. I have a Tubelab Simple SE amp but wondering what wattage value should I use? Should I use the 5W ,3W or is 1/2W OK? For the selector switch I am planning on using a 6-position, 2-Pole, single deck rotary switch. What should the voltage rating be, should if be 250V or higher?
Thanks, sorry about all the question but I need to get these things ordered.
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Old 3rd May 2013, 05:44 AM   #8
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That depends on how much current flows through your tube ?

And then the value of the resistor.

Then use ohms law to find out how much you are disspating and multiply with a safety margin to make the resistor run cool.

Bigger isnīt a bad thing in this case as long as you got room.

If you parrallel while lowering the resistance then you distribute the load and can use smaller resistors.
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Old 3rd May 2013, 06:12 AM   #9
chrish is offline chrish  Australia
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Is there any particular reason you have chosen a carbon resistor for the cathode resistor? A wire wound high wattage resistor is probably better suited. Inductance from a wire wound is negligible (see Morgan Jones 'Valve Amplifiers). Moreover, carbon produces significant distortion, particularly when placed in a position where it will pass a relatively large current (such as in your intended utilisation).

Something else to consider is how you are going to wire up the cathode resistance with the switch. The worst way would be to have each switch position switch into the circuit the exact value of the resistance required. By this I mean if you require 1200R, 1000R and 800R, you should not have a 1200R resistor, a 1000R resistor and an 800R resistor and simply switch between them. A much better solution is to have the highest resistance required hardwired into the circuit. The switch would then be used to parallel various other resistors with that fixed resistor. This way, a switch failure or an inadvertent switch selection while the amp is powered up will be less disastrous.

Last edited by chrish; 3rd May 2013 at 06:16 AM.
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Old 3rd May 2013, 06:40 AM   #10
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Since this is for testing different tubes/settings ?

What i have is a box with simple toggle switches and a bunch of painton 6W resistors in it.

That way i can combine all the resistors individually.

Itīs just a piece of perforated metall with switches and some stripboard and 2 leads coming out that attach to the circuit.
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