- This has me puzzled (resistor change) - 6 Updates
- WD-40 to clean electric contacts? - 5 Updates
- Dyson cyclone puzzle - 1 Update
| tabbypurr@gmail.com: Jan 20 10:56PM -0800 > (electrically), and their only difference is appearance. Now I learn > that is not true..... > WHY????? So IIUC he changes the R value and it no longer oscillates. Presumably he's thereby changed the loop gain. Where is the surprise? NT |
| tubeguy@myshop.com: Jan 21 02:22AM -0600 On Mon, 21 Jan 2019 00:10:42 +0100, Sjouke Burry >A bulk carbon resistor has less self-inductance. I kind of thought that might be the case.... I prefer using the old carbon resistors in vintage tube gear, but they are getting hard to find and expensive. They are all NOS now. i dont think there is any place making them anymore. |
| tabbypurr@gmail.com: Jan 21 12:37AM -0800 > I prefer using the old carbon resistors in vintage tube gear, but they > are getting hard to find and expensive. They are all NOS now. i dont > think there is any place making them anymore. Rapidonline does carbon comps. I'm sure it's far from the only supplier. There's no upside to them other than pulse power ability & for some cases looks. NT |
| Look165 <look165@numericable.fr>: Jan 21 10:22AM +0100 Carbon resistors are noisy. We used that for making white noise and then by filtering, make sine wave or else. With metal resistors there is not enough noise. |
| Ralph Mowery <rmowery28146@earthlink.net>: Jan 21 10:20AM -0500 In article <2450f296-8d19-4c68-bad1-16493d1ebb2e@googlegroups.com>, tabbypurr@gmail.com says... > > WHY????? > So IIUC he changes the R value and it no longer oscillates. Presumably he's thereby changed the loop gain. Where is the surprise? Could it have been possiable that the new resistor was bad, or maybe the color code was read wrong so the wrong value was put in ? |
| John Robertson <spam@flippers.com>: Jan 21 08:38AM -0800 On 2019/01/20 7:16 p.m., John-Del wrote: >> Carbon comp let out lots of magic smoke... >> John :-#)# > And when they don't, they change value in a big way when overheated. On our jukebox tube amplifiers we test every resistor as many of them have happily drifted off-spec more than their tolerance. Usually plate of cathode resistors of course because they pass the most current. John :-#)# -- (Please post followups or tech inquiries to the USENET newsgroup) John's Jukes Ltd. MOVED to #7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3 (604)872-5757 (Pinballs, Jukes, Video Games) www.flippers.com "Old pinballers never die, they just flip out." |
| Look165 <look165@numericable.fr>: Jan 21 10:29AM +0100 Try to clean dishes with it !!! Tom Biasi a écrit le 21/01/2019 à 05:56 : |
| "pfjw@aol.com" <peterwieck33@gmail.com>: Jan 21 05:35AM -0800 Here we go again! WD-40 is not: A lubricant. A contact cleaner. Sticky or gummy. It is a 100% volatile light solvent, mostly ultra-refined kerosene, designed to displace water so that whatever it is may be cleaned or lubricated with something designed for the purpose. A sticky, gummy mess is what happens when existing skunge dissolves into WD-40 and is then distributed throughout whatever it is - for which the WD-40 is then blamed. The stuff is a cheap rinse, quite useful for removing and loosening skunge, rust and other detritus *IN PREPARATION FOR* the correct permanent treatment. One useful purpose - spray on snow-blower tines prior to use. It helps to keep things moving. Similarly lawn-mower blades and pan. Less build-up. Cleaning audio controls - Not so much unless followed up with the correct permanent solution thereafter. But, if it is between that and landfill - have at! Peter Wieck Melrose Park, PA |
| Martin Gregorie <martin@mydomain.invalid>: Jan 21 03:04PM On Sun, 20 Jan 2019 23:17:49 -0500, Ralph Mowery wrote: > Try Kroil. That is often hard to come by. Maybe PB Blaster will work. > Even some home brew mix of Ed's Red. That looks promising. Thanks. -- Martin | martin at Gregorie | gregorie dot org |
| Martin Gregorie <martin@mydomain.invalid>: Jan 21 03:13PM On Sun, 20 Jan 2019 20:48:21 -0800, Phil Allison wrote: > ** WD-40 is specified as being "multi purpose' Advertising. If you go to their site and read the FAQs it says quite clearly that the original WD-40 is a water-displacing anti-corrosion product. They also make a range of other products which are carb cleaners, penetrating oils, etc., but these are all sold under the "WD-40 Specialist..." label. I think you're referring to "WD-40 Multi-use Product" rather than the original WD-40. -- Martin | martin at Gregorie | gregorie dot org |
| Dumas.Walker@f10.n1.z379.fidonet.org (Dumas Walker): Jan 21 09:31AM +1200 > hater > ... rave on haters, i didn't say it was the BEST). > it is also REALLY good for removing sticky goo. No hate here... I am with you on this. :) --- * SLMR 2.1a * DALETECH - for all your home security needs! |
| bruce2bowser@gmail.com: Jan 21 06:43AM -0800 On Friday, January 18, 2019 at 11:13:03 PM UTC-5, Ralph Mowery wrote: > > appliance about three years ago. I'm glad I don't need one: I just > > happened to notice it while looking for something else. > There seems to be 2 problems now. Maybe more. > Many younger people do not know how to repair things. All they do is > play video games and text each other. And program phones/computers and binge-watch shows. |
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