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Paging Speaker With Dull Hum

 
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Old 04-15-2019, 07:43 PM   #21
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Re: Paging Speaker With Dull Hum


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Originally Posted by Leo G View Post
Probably take 25 minutes to fix it.

How so Leo??

It will take me at least 15 minutes to get it off the wall.

Then 5 minutes to tear apart to ID the Cap or Caps

Then 15 minutes to drive to my office.

Then .0267 seconds to Google a source.

Then 30 minutes on the phone to verify that the
the top website really has eyes on stock.

Then depending on location 3 to 5 days to receive the shipment.

Then 5 minutes to unpack and warm up my soldering iron.

Then 2 minutes to de-solder.

The another 2 minutes to mount and solder.

Then drive 15 minutes back to site.

Then 5 minutes to remount, connect and power up. (now that I know the tricks)

Then lastly 5 minutes to test the system and hope it works.

WOW!! I am not going to do the math but I am sure
I could shave a few milliseconds off here or there.

Thanks for the thoughts, but I will stick to my plan of just replacing with new.

Really want to make my life as simple as possible.

Les
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Old 04-15-2019, 07:52 PM   #22
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Re: Paging Speaker With Dull Hum


So an hour and a half. Cheaper than buying a new unit and installing it.
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Old 04-15-2019, 07:52 PM   #23
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Re: Paging Speaker With Dull Hum


If it fixes the problem
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Old 04-15-2019, 08:12 PM   #24
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Re: Paging Speaker With Dull Hum


Mouser and digikey are my go to parts suppliers.

Radioshack used to stock some stuff, but what's a Radioshack?
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Old 04-15-2019, 08:45 PM   #25
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Re: Paging Speaker With Dull Hum


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Mouser and digikey are my go to parts suppliers.

Radioshack used to stock some stuff, but what's a Radioshack?

The original RatShack was so much better than the one that
went belly up. Sadly, that may have been their demise.

Of course there were many other factors to numerous
to mention hear.
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Old 04-21-2019, 03:23 PM   #26
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Re: Paging Speaker With Dull Hum


For those that are interested.

Replaced the Amp yesterday with a New Bogen TPU100B Amp.
Swap took about 30 minutes mainly due to the location.
Would have liked to reposition but was not possible due
to the limited space. The Amp works great and all is good.

I opened up the old University Sound Amp and there was only
one Cap. 50V 10000uf 1.125" Dia. x 2" Long
There were no signs of any leakage.

There is another smaller alum. can that had no markings.
The end wire leads had a silicon sealant filling the end.
Not sure what it is or was.

For me there is really no good reason to repair this Amp.

Therefore it is going to trash.

Thanks again to all the input.

Happy Easter.

Les
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Old 04-21-2019, 06:28 PM   #27
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Re: Paging Speaker With Dull Hum


The main way old caps like that fail is from the electrolyte drying up, resulting in loss of capacitance. There are no visual external symptoms of that; you need to check the value with a tester.

Leakage is usually caused by a short or partial short--much less common if the cap has already survived 4-5 years or so.

RIP.
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Old 04-21-2019, 09:50 PM   #28
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Re: Paging Speaker With Dull Hum


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Originally Posted by Tinstaafl View Post
The main way old caps like that fail is from the electrolyte drying up, resulting in loss of capacitance. There are no visual external symptoms of that; you need to check the value with a tester.

Leakage is usually caused by a short or partial short--much less common if the cap has already survived 4-5 years or so.

RIP.
Agreed!!

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