IWAKI power resistors - need info - diyAudio
Go Back   Home > Forums > Design & Build > Parts
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 24th June 2004, 08:08 AM   #1
diyAudio Member
reaction's Avatar
Join Date: Jun 2004
Location: Bulgaria
Default IWAKI power resistors - need info

Just bought a lot of NOS Japanese made IWAKI resistors and I am looking for more info about them - are they wirewound or film ones, are they inductive or non inductive ones etc. I have found the IWAKI site but unfortunately it is only in Japanese and there is no email address for inquiries.

This is the link of the product line (in Japan).

The marking of the resistors is:

CS5P (5W)

Appreciate your help - thanks.

Last edited by reaction; 11th March 2017 at 07:15 AM.
  Reply With Quote
Old 24th June 2004, 09:12 AM   #2
diyAudio Member
Join Date: Jun 2004
Location: Yokohama
Hello. I checked the Web site per your questions.

These are the answers:
1. They are wire-wound resistors.
2. Five Watt resistors are
inductive for 0.02 Ohm to 30kOhms
and non-inductive for 18 Ohm to 15k Ohms.
3. Non-inductive resistors have suffixes of K, H or F
per their accuarcy. I could not find at the Web site
if the suffixes are shown on the resistor bodies.

Hope this helps.
  Reply With Quote
Old 24th June 2004, 09:52 AM   #3
diyAudio Member
Join Date: Feb 2002
Location: Ontario
They mention that the bobbin (nearest translation) is made of a material with very good heat transfer characteristics, so they are probably wire-wound. With the markings on your resistor, they are the inductive type. The non-inductive ones are labeled NCS5P.
  Reply With Quote
Old 24th June 2004, 10:56 AM   #4
diyAudio Member
reaction's Avatar
Join Date: Jun 2004
Location: Bulgaria
cpu_bach and greyhorse - thank you very much for your speedy help!

An offtopic question - what is your personal opinion regarding the audio signal quality about using inductive wirewound resistors as power line resistors in tube amp PSUs? Personally, I don't find any audible difference when using inductive and non inductive ones in my tube circuits.
  Reply With Quote
Old 24th June 2004, 01:22 PM   #5
diyAudio Member
Join Date: Jun 2004
Location: Yokohama
I don't care if the resistors are inductive or not in view of the sound. However, I care the inductiveness when I apply the resistors for wide-band amplifiers. You may get an oscillator instead of an amplifier, if you use inductive resistors.
I usually make tube amplifiers and avoid using inductive resistors for plate loads which has high circuit impedance and cause high frequency unstability.
  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Power supply resistors power ratings Nihilist Tubes / Valves 13 31st July 2009 01:47 AM
Info on Resistors / series resistance one1speed Full Range 7 24th February 2006 01:29 PM
resistors, capacitors, etc. NEED MORE INFO! sjay8179 Tubes / Valves 6 6th March 2004 01:04 PM
Source info for 8ohm/1ohm Dale (JAN) resistors psarin Pass Labs 1 19th November 2001 04:33 AM

New To Site? Need Help?

All times are GMT. The time now is 09:00 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2