[ARC5] Very Interesting Troubleshooting Tool

[J Mcvey]

 That is an interesting tool, BUT, note that he used the detector to find a bad silver mica cap.The device could probably find flaky coils too. However, I doubt it will do much for finding leaky paper caps because there are no rapid changes to cause the noise.Most paper caps in ARC-5 equipment ARE leaky, so I just "restuff" the flower pots  to be done with it.

    On Monday, April 24, 2023 at 10:15:18 PM EDT, <hwhall at compuserve.com> wrote:  
 
 

 I probably will try to use IC amplifiers after a Hi-Z fet front end, rather than discrete comonents

I'm interested in that approach.  I wondered how much gain is needed and if there's FET input IC amplifiers that can do the trick in one active device.
WayneWB4OGM

-----Original Message-----
From: arc5 at ix.netcom.com
To: arc5 at mailman.qth.net; Milsurplus <Milsurplus at mailman.qth.net>; boatanchors <boatanchors at mailman.qth.net>
Sent: Mon, Apr 24, 2023 1:34 pm
Subject: [ARC5] Very Interesting Troubleshooting Tool

This video is very interesting indeed. A fellow built of high sensitivity, High amplification RF and audio probe. Put a little B plus on your B+ bus, go around capacitors and resistors and this thing is sensitive enough to pick up the miniature lightning inside a leaky cap even when it's too small to be heard in your speaker  Pretty cool. I intend to build one, although I probably will try to use IC amplifiers after a Hi-Z fet front end, rather than discrete comonents but we'll see. Has a schematic in the video and more information under the video.  I'd like to try it with B+ on the bus but the filaments turned off. You should still get the lightning.

https://youtu.be/uiK1BD7HILo

73 Dave AB5S


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