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 Post subject: 12uf?
PostPosted: Jul Mon 08, 2019 8:03 am 
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Anyone ever see this value before? It's from a Royal 810.


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 Post subject: Re: 12uf?
PostPosted: Jul Mon 08, 2019 10:09 am 
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NOPE!!

I might believe 0.068 though.

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 Post subject: Re: 12uf?
PostPosted: Jul Mon 08, 2019 11:19 am 
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0.068uf wouldn't be electrolytic though.

Just test it, should be fine.


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 Post subject: Re: 12uf?
PostPosted: Jul Mon 08, 2019 11:36 am 
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The 1068 is a part number. You can use a 15 uf as these were not close tolerance parts. I will move this to the transistor radio section.


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 Post subject: Re: 12uf?
PostPosted: Jul Mon 08, 2019 12:10 pm 
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Where is it on the schematic?

n3uvt wrote:
Just test it, should be fine.

No!!--if it's an electrolytic, it's not fine...

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 Post subject: Re: 12uf?
PostPosted: Jul Mon 08, 2019 1:35 pm 
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It's most certainly a 12 mfd & could be fine, though may have lost some capacitance. Sometimes the end seals crack allowing the electrolyte to dry out, renders them kaput.

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 Post subject: Re: 12uf?
PostPosted: Jul Mon 08, 2019 2:49 pm 
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pixellany wrote:
Where is it on the schematic?

n3uvt wrote:
Just test it, should be fine.

No!!--if it's an electrolytic, it's not fine...

Translation: If you value your time, it's faster and easier to just replace. To do a proper test requires removal anyway.
If you DO test it, you still have no assurance it will not go bad soon.

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"Measure voltage, but THINK current." --anon.


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 Post subject: Re: 12uf?
PostPosted: Jul Mon 08, 2019 3:08 pm 
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Location: Lexington, KY USA
15uF will no doubt be fine, but 12uF is a standard value. In stock at Mouser, starting at $0.20 each.

https://www.mouser.com/Passive-Componen ... =Pricing|0

Note that axial lead caps are just about extinct. A new radial replacement will be smaller, and can be made to fit, or used for restuffing.

Ted


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 Post subject: Re: 12uf?
PostPosted: Jul Mon 08, 2019 5:34 pm 
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1068 is likely a date code. 10th week of 1968.

Replace it.

Rich


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 Post subject: Re: 12uf?
PostPosted: Jul Mon 08, 2019 5:37 pm 
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Location: Panama City, FL 32401
Its been replaced, I had never heard of this value before. I've also read someone had a 4uf cap. You learn something new every day...


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 Post subject: Re: 12uf?
PostPosted: Jul Mon 08, 2019 11:32 pm 
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I replaced a bunch of those black and reds in a 64ish Zenith console stereo, but I tested them anyway and as I recall, they seemed to not be testing bad. My issues were with the small signal Germanium transistors failing, which, by some blessing, were plugged into sockets. Choose one from channel A, swap with channel B, till you knew which were weak and making all the noises.

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 Post subject: Re: 12uf?
PostPosted: Jul Tue 09, 2019 12:50 am 
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Rich, W3HWJ wrote:
1068 is likely a date code. 10th week of 1968.

Replace it.

Rich

1068 is EIA code for Callins.

Code dates were stamped as year, followed by week.

Using the proper EIA system, 1068 has no meaning. I suppose it could be 2010, week 68.

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 Post subject: Re: 12uf?
PostPosted: Jul Tue 09, 2019 1:30 am 
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The Callins capacitors, just like the Nashville ones have no safety vent!

Image

Image

Royal 810 Sams TSM-72
and identical model Royal 51 Sams TSM-84
minor capacitor differences between models.

Greg.


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 Post subject: Re: 12uf?
PostPosted: Jul Tue 09, 2019 2:06 am 
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Location: Santa Rosa, CA
Quote:
1068 is EIA code for Callins.

At Westinghouse Semiconductor, we used a two letter code. The first letter was the half year, the second letter was the week code. Later reverted to 4-number YYWW pattern.

Rich


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 Post subject: Re: 12uf?
PostPosted: Jul Tue 09, 2019 4:07 am 
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wazz wrote:
I replaced a bunch of those black and reds in a 64ish Zenith console stereo, but I tested them anyway and as I recall, they seemed to not be testing bad. My issues were with the small signal Germanium transistors failing, which, by some blessing, were plugged into sockets. Choose one from channel A, swap with channel B, till you knew which were weak and making all the noises.


I've had transistor failures, or weak transistors in the early Royal 500,and 3 Royal 300's I have. The 1960's transistors appear to be much better from my experience. The 121-64 driver and 121-61 finals used in the 500D,500E versions are much better than the earlier 2N35.


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