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 Post subject: Re: OS-8 oscilloscope problem
PostPosted: Feb Tue 06, 2018 8:39 pm 
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Joined: Feb Mon 13, 2017 5:42 pm
Posts: 100
Location: Gualala, CA, 95445
Thanks. Antique Radio Supply has some multiple 20 mF can caps, but they are $38 or so each! Not sure if they are the right physical size.

Looks like the CRT is slightly curved.

Richard


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 Post subject: Re: OS-8 oscilloscope problem
PostPosted: Feb Wed 07, 2018 12:29 am 
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Joined: Feb Mon 13, 2017 5:42 pm
Posts: 100
Location: Gualala, CA, 95445
See:

https://www.tubesandmore.com/products/c ... ectrolytic

and

https://www.tubesandmore.com/products/c ... v-202020-f

I wonder if the measurements are acceptable (a good fit)?

Pricey, but if it is basically drop in and re-connect, it might be worth it.

Richard


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 Post subject: Re: OS-8 oscilloscope problem
PostPosted: Feb Wed 07, 2018 1:08 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 18258
Location: Warner Robins, GA
Not sure if they will fit. Best thing to do is look at the dimensions of the new cans then measure the original cans and see if they are nearly identical. If so then check to be sure the new cans have the same tabs as the originals.

If so use them.

If not you will have to do like I did.


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 Post subject: Re: OS-8 oscilloscope problem
PostPosted: Feb Wed 07, 2018 4:30 pm 
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Joined: Feb Mon 13, 2017 5:42 pm
Posts: 100
Location: Gualala, CA, 95445
I kind of like the idea of rebuilding them. It might also save quite a bit of money!

Richard


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 Post subject: Re: OS-8 oscilloscope problem
PostPosted: Feb Wed 07, 2018 4:39 pm 
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Joined: Feb Mon 13, 2017 5:42 pm
Posts: 100
Location: Gualala, CA, 95445
How did you cut the capacitor cans open?

Richard


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 Post subject: Re: OS-8 oscilloscope problem
PostPosted: Feb Wed 07, 2018 8:33 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 18258
Location: Warner Robins, GA
Think I used a Dremel with a small cutoff wheel installed.

I'll get a picture or two tomorrow showing where the cans need to be cut.

Now if the cans were visible from the outside I would have bought new cans, but since they are on the inside I thought why.


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 Post subject: Re: OS-8 oscilloscope problem
PostPosted: Feb Wed 07, 2018 8:50 pm 
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Joined: Feb Mon 13, 2017 5:42 pm
Posts: 100
Location: Gualala, CA, 95445
Thanks.

Richard


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 Post subject: Re: OS-8 oscilloscope repairs
PostPosted: Feb Sun 11, 2018 8:15 pm 
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Joined: Feb Mon 13, 2017 5:42 pm
Posts: 100
Location: Gualala, CA, 95445
I got the side of the OS-8 off and can see the power supply.

It looks like it is secured by four small machine screes. If those screws are removed, is the power supply free to come out of the box? Which side?

It would see to be quite difficult to get the washers and nuts back on the screws when re-assembling!

Are there other capacitors that it is best to replace in addition to the two "can" type capacitors in the power supply?

Richard


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 Post subject: Re: OS-8 oscilloscope problem
PostPosted: Feb Sun 11, 2018 8:52 pm 
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Posts: 18258
Location: Warner Robins, GA
Yes all other paper capacitors and if there's other small electrolytic caps replace them too.

That's for the whole scope.
Forget which side I took the supply out of. Whichever side the wires going to the supply allow it to come out.


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 Post subject: Re: OS-8 oscilloscope problem
PostPosted: Feb Sun 11, 2018 9:11 pm 
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Joined: Feb Mon 13, 2017 5:42 pm
Posts: 100
Location: Gualala, CA, 95445
Thanks. I like your hat.

Tricky to put the screws back in?

Richrd


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 Post subject: Re: OS-8 oscilloscope problem
PostPosted: Feb Mon 12, 2018 4:15 am 
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Posts: 18258
Location: Warner Robins, GA
You're welcome and thanks.

I forget if it was tricky for the screws.

Also replace all non-wirewound resistors with 1% metal film resistors wherever possible. Given the chassis of the scope are so compact you don't want to have to go back in later to replace a failed original resistor.


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