Yes, I realize that I don't want to heat the resistors. I was asking if anyone knew the ratings for these resistors, as they are incompletely marked. I'm not looking to start a long discussion.
Joe Gray W5JG On Sun, Aug 18, 2013 at 12:57 AM, Laurence Motteram < [email protected]> wrote: > "Wattage" and precision resistors could make for a very long thread. For > best stability, you do not want to heat up the resistor very much. A power > rating would normally be related to a permitted temperature rise, but you > might not want your resistor to rise to that temperature. This way leads > to several interrelated compromises. > > Laurence Motteram > > ________________________________________ > From: [email protected] [[email protected]] on behalf > of Joseph Gray [[email protected]] > Sent: Sunday, 18 August 2013 2:47 PM > To: Discussion of precise voltage measurement > Subject: Re: [volt-nuts] Precision resistors > > Raj and John, > > Thanks for the advice. I'll go with some mild dish detergent and water. The > black, rectangular resistors are definitely marked "Daven", just like all > the others. > > The bobbins are marked .02%, 1/2 W. The black rectangles are .1% (no > wattage) and the micas are simply marked 85, which I assume is the > resistance. Any idea what the wattage of the black ones are? Also, what > percentage and wattage would the micas be? The micas are thumb-sized > squares (just so I don't confuse the metric or imperial users :-) ). > > Joe Gray > W5JG > > > > On Sat, Aug 17, 2013 at 7:18 AM, J. Forster <[email protected]> wrote: > > > The red 'sealant' is Glyptal laquer. Probably safe to water wash. > > > > I would not use any solvent on the bobbins. > > > > The black encapsulates are likely Vishay, if they look like CK-05/6 > > ceramic caps. Alcohol should be safe for a quick rinse. > > > > -John > > > > ============= > > > > > > > > > Nothing abrasive should be used. Soap and water and old toothbrush is > > what > > > I would try. Very high values avoid water! > > > I use a cheap ultrasonic clear for some things in the shack! > > > > > > Raj > > > VU2ZAP > > > (former resistor manufacturer) > > > > > > At 17-08-2013, you wrote: > > >>What is the recommended method for cleaning dirt, oil, etc from > precision > > >>resistors? I'm talking about a combination of wirewound on plastic > > >> bobbins, > > >>wirewound on mica (and sealed with something) and an unknown type that > is > > >>encapsulated in black plastic rectangles. These are all 1950-1960 > vintage > > >>and are marked "Daven". > > >> > > >>Joe Gray > > >>W5JG > > >>_______________________________________________ > > >>volt-nuts mailing list -- [email protected] > > >>To unsubscribe, go to > > >> https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > > >>and follow the instructions there. > > > > > > _______________________________________________ > > > volt-nuts mailing list -- [email protected] > > > To unsubscribe, go to > > > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > > > and follow the instructions there. > > > > > > > > > > > > _______________________________________________ > > volt-nuts mailing list -- [email protected] > > To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > > and follow the instructions there. > > > > > _______________________________________________ > volt-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there. > -- > Message protected by MailGuard: e-mail anti-virus, anti-spam and content > filtering. > http://www.mailguard.com.au > _______________________________________________ > volt-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there. > > _______________________________________________ volt-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
