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-   -   Kiwame resistors (http://www.diyaudio.com/forums/tubes-valves/116634-kiwame-resistors.html)

pmillett 1st February 2008 10:47 PM

Kiwame resistors
 
It looks to me like "Kiwame" resistors are really just KOA SPR2 and SPR5 carbon film resistors.

I got some 8.2k KOA SPR2 resistors in Japan for 4 cents each. I just compared them to 8.2k 2W Kiwame resitors.

I cannot find any differences between them.

Both have non-magnetic leads and end caps, which look by eye to be the same material. Both appear identical externally, and also inside the green coating (which I scraped away with a knife).

I measured 20 pcs. of the KOA resistors and all were within 0.25% of nominal - most within 0.1%. These are specified as 5% resistors.

I believe that they are the same thing, and "Triode Co." in Japan is just selling the KOA's at a premium price.

The KOA SPR series is not very common, but Mouser in the US carries a limited selection of the 2 watt parts.

Pete

Eli Duttman 1st February 2008 11:25 PM

Pete,

THANK YOU!! Whatever Mouser stocks will save us from being gouged, at least some of the time.

Now, I wonder how good KOA-Speer low wattage Carbon film resistors are

defect9 1st February 2008 11:43 PM

/runs to go buy a fudgeload of resistors of various types

am I the only one that thinks someone could easily buy the KOA and pass them off as Kiwame, with significant profits? And that its possible someone is already doing it? Don't worry, you won't find me selling them on ebay. I'm too lazy for that.

however, if I can get significant savings doing it this way, no harm done, right? $0.16 versus $2 is worth it to me. I'll get some of the Kiwames just for comparison to hear for myself, but if it;s true, or close enough, then I'm one very happy dude.

...can anyone find cheaper Caddock and/or Rikens? Maybe some cheap Blackgates, Jensens, or any of the other good caps?

I'd not be too surprised if this sort of thing happens often...

ja2dhc 2nd February 2008 07:28 AM

Hi, Pete-san

I fully agree with you. I found the data sheet of KOA SPR resistor
from KOA Germany Web site as below.

http://www.koaeurope.de/at/koa/pdf/spr(x).pdf

It clearly says SPR is Carbon and SPRX is metal film.

'73 de JA2DHC

revintage 2nd February 2008 11:24 AM

Thanks Pete,
Checked Mouser and they had the 1/2watts too. Was just about to order Kiwames when I saw this thread.
Thanks again!

kstagger 2nd February 2008 11:57 AM

I ordered some last night - before we deplete the stocks!

defect9 3rd February 2008 06:12 AM

Quote:

Originally posted by kstagger
I ordered some last night - before we deplete the stocks!
People have been afraid of depleting the stocks since september, or earlier (earliest I found a mention was from september on a different DIY site). I don't think we have to worry :D

-J

kstagger 3rd February 2008 01:08 PM

Quote:

Originally posted by defect9


People have been afraid of depleting the stocks since september, or earlier (earliest I found a mention was from september on a different DIY site). I don't think we have to worry :D

-J


Suppose they will restock the values necessary - just the experience of buying NOS tubes makes you paranoid :cannotbe:


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