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Forum Index : Electronics : Sierra 125B Frequency Selective Voltmeter

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Dinosaur

Guru

Joined: 12/08/2011
Location: Australia
Posts: 303
Posted: 02:46am 06 Apr 2020
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Hi all

After having all my equipment in a storage unit for 7 years, I am finally settled enough in our new home to take some time and check it all out.
Everything was wrapped in plastic wrap  with an old sock full of Bentonite Kitty Litter to keep the moisture at bay.

Mouse /Cockroach baits all around the the storage unit.

Everything was perfect except for the above instrument.
It had a huge mouse nest in it, remnants of mouse bait, but no dead mice.
Luckily the internal wiring was not rubber insulated so nothing was damaged,except
for the smell of course.

I do have a broken capacitor that I can't identify.



Don't know if the Minus sign before the number indicates it is polarized, but suspect
that it is. So the question is, can I replace it with an electrolytic ?

Haven't got a manual for this but will search for it. It worked very well before I packed it up.  

Regards
Regards
Hervey Bay Qld.
 
SimpleSafeName

Senior Member

Joined: 28/07/2019
Location: United States
Posts: 284
Posted: 04:46am 06 Apr 2020
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It's hard to tell without a reference to scale, but it looks to be non-polarized (or bipolar, same thing) cap.

This one would probably work just fine:

https://www.ebay.com/itm/CBB60-D12-2uf-450-Volt-Handing-Round-Motor-Run-Capacitor/141712350333?hash=item20feb6dc7d:g:1bMAAOSwFNZWz3yB

If your device can tolerate a bit less voltage, this might be a good one for you:

https://www.ebay.com/itm/2-NOS-Bipolar-Sprague-1uF-300VNP-Aluminum-Axial-Electrolytic-Capacitor-TVAN1560/133362295917?hash=item1f0d03246d:g:eY0AAOSwvGdbmbkb
 
CaptainBoing

Guru

Joined: 07/09/2016
Location: United Kingdom
Posts: 1983
Posted: 07:17am 06 Apr 2020
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I suspect you are right about the minus sign especially as it does say 350VDC so getting the polarity right would have been important or you get a visit from Grogster's genie.

Even so, generally capacitance is capacitance - you can usually go TO bipolar from electrolytic but not the other way around (barring special requirements).

I would chuck a 1uF 400V X type (used in mains filters etc.) in there and see what happens. Can't hurt and they are cheap as...

hth

h
 
Volhout
Guru

Joined: 05/03/2018
Location: Netherlands
Posts: 3423
Posted: 11:24am 06 Apr 2020
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https://www.ebay.com/itm/2pcs-MPT-1uF-400V-DC-Audio-Grade-Axial-Capacitor-HIFI-Guitar-Amp-Tube-Amplifier/192332866219?_trkparms=ispr%3D1&hash=item2cc7eea2ab:g:ZV4AAOSw8b1aG6ns&enc=AQAEAAACQBPxNw%2BVj6nta7CKEs3N0qVK87IDQUrcec%2BKDc0IvHqGahtP3KXky1e2VEeWNsZsygwFNN4sFmvCTi2KvjPINhSFhIASMzQsS26ELKUiqqeqdYgaB%2Bzw89iemI96B9Ss%2BWv0ZBnyEwVyZ%2Fr1TYzhuXum3%2BnOKM%2BP2%2FgSaalTfHEKzURKTAa0yfQzF3bifM%2BnaUCbcbhFmsf1W38c18hbpyyzaEHPF392RYJ0FtASUXv1qudnd3PQ4sc6UljrYnjh5pGe7TRlvM4BHq%2FSqjwgSlxRLFoB6OgbIQX8uVfFykw%2FLNDWaTnZmgzTFulihUZZmN%2BsIPNxymGlNA50jCOFUvLerOTMjHgbkVRc1wqZ83YoZaGoLOeW32fvbYbwHCrG8JE03gQ7zFL6EH6%2BwoK3B%2BXEgjhHk0Fp4O7XIGNOHaZR6Cd5lBEFvBUU7HRJC3jsfIV9g2urRl52mRRwSCqDc%2FbrwvonDjobGzfBbPZ50%2F3PeOnCArRzWCP5oApzonJVJwAqp%2FPLU5Zr%2FH3jkY0MbJteS3vGNltaveSnapa6dtnSCLpsAfMfMDKenhAfQDAsWTN3H3rPqQX0Y2eFm8oRzkvwbu9fUDZsHMasMG4RJXIaFY%2FZy7FaM%2FUva85EgJh1icZT0SAJsW3nF%2BTXfm01a3pqr593Wx1eFCUFzeBo1F5nS02viaH691Sa%2Bm%2BENBnEZ%2Bd9t5x1W3N4pOd02MlwUPFJ%2B5zuGMx1fMVCiIP64LKETr160i2FVpezUXufPaOAhg%3D%3D&checksum=192332866219d7ac6c32d00b466e9228f9b7de790a6f
PicomiteVGA PETSCII ROBOTS
 
Dinosaur

Guru

Joined: 12/08/2011
Location: Australia
Posts: 303
Posted: 09:07pm 06 Apr 2020
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Hi All

Many thanks for the responses and links.
Wow I didn't know capacitors could get that expensive.

Spent the money and ordered a manual for it, so once that arrives the circuits should
shed more light on the purpose.
Regards
Hervey Bay Qld.
 
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