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.
