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"Don" <g@crcomp.net>: Dec 11 04:13PM Greetings,   Why do Callins capacitors command such a high premium:   https://richelectronics.co.uk/product/callins-300uf-25v-audio-capacitor-vintage-low-esr-ol0382b   What's so special about them?   What's a good substitute?   Danke,   -- Don, KB7RPU There was a young lady named Bright Whose speed was far faster than light; She set out one day In a relative way And returned on the previous night.

Fox's Mercantile <jdangus@att.net>: Dec 11 10:23AM -0600 On 12/11/20 10:13 AM, Don wrote: > What's so special about them?   Nothing. They aren't even new, they are surplus. As PT Barnum's competitor said, "There's a sucker born every minute."   Just buy new 105F Nichicons from a reliable vendor.   -- "I am a river to my people." Jeff-1.0 WA6FWi http:foxsmercantile.com

three_jeeps <jjhudak@gmail.com>: Dec 10 02:51PM -0800 On Monday, November 30, 2020 at 7:00:11 PM UTC-5, RD wrote: > and let it dry, to see if it can be peeled off > cleanly.   > HTH Look at Dow Chemical for silicon based products that are safe for electronics...I used some of their products in a similar application many many moons ago...damn if I can remember the product numbers... J

dplatt@coop.radagast.org (Dave Platt): Dec 10 04:12PM -0800 In article <a5799dfb-f0d5-4ffb-adb3-097bfa1e3b7cn@googlegroups.com>,   >Look at Dow Chemical for silicon based products that are safe for electronics...I used some of their products in a similar application many many >moons ago...damn if I can remember the product numbers...   Dow 3145 is one such. You won't like the price very much, but it's MIL-spec'ed for this sort of purpose.   Dow's Dowsil 737 is a neutral-cure which seems of a similar nature - not a MIL-spec reference, but it's much more affordable.

bruce bowser <bruce2bowser@gmail.com>: Dec 10 12:40PM -0800 On Sunday, December 6, 2020 at 1:51:14 PM UTC-5, Peter W. wrote: > My brother has a very vintage pair of Acoustat speakers driven from what he describes to me as an Acoustech IV pre-amp, distinguished by having phono-jack outputs directly to the speakers. Which have large, heavy, powered boxes attached. After many years of sitting unused, they went silent on him. I suspect the pre-amp, but at-a-distance, I cannot be sure. No, I do not have the model number of the speakers, but they are self-powered, very nearly 2 meters tall, just over 6 feet, There are three fuses on the back, a removable power-cord, an on-off switch, the 1/4" phono jack input and a 5-position treble boost/cut knob. Which should narrow it down.   > Question: is that specialized pre-amp required, or would any normal audio pre-amp do?   No idea, but that vintage stuff out there in Kutztown, PA is something compared to the microscopic breadboards 3D printed out in Silicon Valley. Those late-model "echo device" speakers of the new generation are really becoming loud, too.

bruce bowser <bruce2bowser@gmail.com>: Dec 10 12:37PM -0800 On Sunday, December 6, 2020 at 2:05:08 PM UTC-5, Jeff Liebermann wrote: > from getting into the threads on the lid. Once the stuff hardened, it > was impossible to remove the lid. I tried various straps, clamps, > pliers, pipe wrenches, and solvents. Nothing would get the lid loose.   I'm a regular with liquid nails when wiring up construction sites and I know the feeling trying to recover goop, sparkle, other tube/can/bottle contents. I guess ultimately two channel locks going in opposite directions might crush or damage the bottle if wet rags don't cushion the jaws. I've seen where you could use a belt to unscrew an oil filter near a car's engine for an oil change.

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