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 Post subject: Bumblebee ID?
PostPosted: Aug Wed 08, 2018 8:24 pm 
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Hi,
can you help with the ID of this cap? Pretty sure it's 0.0047uf but I'm not sure on the voltage.......


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 Post subject: Re: Bumblebee ID?
PostPosted: Aug Wed 08, 2018 8:44 pm 
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Location: RI, 02885
0.047mfd 20% 1600V
Definitely ready for replacement.

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 Post subject: Re: Bumblebee ID?
PostPosted: Aug Wed 08, 2018 8:52 pm 
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Bugman wrote:
0.047mfd 20% 1600V
Definitely ready for replacement.


Thanks! Now over to Sal's caps........

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 Post subject: Re: Bumblebee ID?
PostPosted: Aug Thu 09, 2018 5:02 am 
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Location: Freehold NJ 07728
Steve,
I emailed you a total.

sal

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 Post subject: Re: Bumblebee ID?
PostPosted: Aug Thu 09, 2018 4:38 pm 
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Joined: May Sat 06, 2006 4:03 am
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Location: ZIP 23831 South of Richmond, VA 25 miles down the pike.
Voltage 1600? Blue is 600 volts.

Bill J.


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 Post subject: Re: Bumblebee ID?
PostPosted: Aug Thu 09, 2018 6:20 pm 
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NumberMaj 1 wrote:
Voltage 1600? Blue is 600 volts.

Bill J.



Mis-read the chart. I was using the Sprague chart.

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 Post subject: Re: Bumblebee ID?
PostPosted: Aug Thu 09, 2018 6:26 pm 
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NumberMaj 1 wrote:
Voltage 1600? Blue is 600 volts.
Bill J.
Bill,

Bumblebees were available in 1600v and higher. Those voltages were shown as two bands.
The first band (closest to value) is thousands of volts, the band to its right being hundreds.

I don't see a brown first band, so your reading of 600 volts would be correct.
But a value of 1600 volts is not impossible.

- Leigh

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 Post subject: Re: Bumblebee ID?
PostPosted: Aug Fri 10, 2018 1:02 am 
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Location: ZIP 23831 South of Richmond, VA 25 miles down the pike.
Right, brown for the 5th band and blue for the 6th band is 1600v.

Bill J.


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 Post subject: Re: Bumblebee ID?
PostPosted: Aug Fri 10, 2018 1:09 am 
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NumberMaj 1 wrote:
brown for the 5th band and blue for the 6th band is 1600v.
Right.

I should have worded it that way.

- Leigh

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 Post subject: Re: Bumblebee ID?
PostPosted: Aug Fri 10, 2018 6:02 pm 
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So it's 0.047mfd 600V?

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 Post subject: Re: Bumblebee ID?
PostPosted: Aug Fri 10, 2018 6:07 pm 
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addyboy wrote:
So it's 0.047mfd 600V?
That appears to be the case.
You might examine the part closely looking for a brown band to the left of the blue band.
Based on the physical position of the bands in the photo, I don't think you'll find that.

What does the parts list say?

Bumblebee caps were generally high-voltage, although they were available down to 200 volt rating.
That's the basic rating of the internal paper dielectric with no oil present. It's what you get when
the plastic cracks and the oil leaks out. That's the normal failure mode for these.

I don't think you will ever find a Bumblebee cap in the third millennium that's good.
Dielectric properties degrade over time, resulting in higher leakage current.
That in turn raises internal pressure, causing the plastic to crack, allowing the oil to leak out.

- Leigh

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Last edited by Leigh on Aug Fri 10, 2018 6:13 pm, edited 1 time in total.

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 Post subject: Re: Bumblebee ID?
PostPosted: Aug Fri 10, 2018 6:13 pm 
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Leigh wrote:
addyboy wrote:
So it's 0.047mfd 600V?
That appears to be the case.
You might examine the part closely looking for a brown band to the left of the blue band.
Based on the physical separation of the bands in the photo, I don't think you'll find that.

What does the parts list say?


Thanks Leigh.
I don't have the parts list because I have reached my quota on Radiomuseum.org

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 Post subject: Re: Bumblebee ID?
PostPosted: Aug Fri 10, 2018 8:46 pm 
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A 60yr old cap........


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 Post subject: Re: Bumblebee ID?
PostPosted: Aug Fri 10, 2018 8:49 pm 
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addyboy wrote:
A 60yr old cap........
Meaningless.

You have to test caps at rated voltage to get any useful information.

Even then, the results don't tell you how it will perform tomorrow.

- Leigh

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 Post subject: Re: Bumblebee ID?
PostPosted: Aug Fri 10, 2018 9:07 pm 
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Leigh wrote:
addyboy wrote:
A 60yr old cap........
Meaningless.

You have to test caps at rated voltage to get any useful information.

Even then, the results don't tell you how it will perform tomorrow.

- Leigh

What more can be said?...

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 Post subject: Re: Bumblebee ID?
PostPosted: Aug Fri 10, 2018 9:34 pm 
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Leigh wrote:
addyboy wrote:
A 60yr old cap........
Meaningless.

You have to test caps at rated voltage to get any useful information.

Even then, the results don't tell you how it will perform tomorrow.

- Leigh


Aha, now i know!

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 Post subject: Re: Bumblebee ID?
PostPosted: Aug Fri 10, 2018 11:32 pm 
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Leigh wrote:
I don't think you will ever find a Bumblebee cap in the third millennium that's good.

I have kept all of my pulls against the possibility that I might want to restuff some for a visually correct restoration, but I've never gotten that ambitious because I don't own any radios or instruments valuable enough to justify the labor involved.

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 Post subject: Re: Bumblebee ID?
PostPosted: Aug Fri 10, 2018 11:41 pm 
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WOW!

Re-stuffing a cracked plastic case would certainly be a major challenge.

- Leigh

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 Post subject: Re: Bumblebee ID?
PostPosted: Aug Fri 10, 2018 11:53 pm 
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Leigh wrote:
Re-stuffing a cracked plastic case would certainly be a major challenge.

Leigh -

I don't bother to keep the cracked ones, just the solid ones. Since any that I come across get replaced before power is applied I have accumulated a fair supply of good-looking bumblebees and black beauties.

Hint to those just getting started in the hobby - for consumer electronics learn to identify all paper caps, including bumblebees and black beauties, and replace them before powering up the equipment. They should all be treated as bad because most of them are, and the ones that aren't bad will be soon. I hate fixing anything twice. I have a couple of old EICO items that have not been touched and that I should get working to sell at the Museum of Radio and Technology fall meet. Step one, of course, it to replace all of the electrolytic and paper caps, as EICO was not HP and used consumer-grade components.

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 Post subject: Re: Bumblebee ID?
PostPosted: Aug Sun 12, 2018 12:51 am 
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Here is a post about restuffing bumblebee caps..

http://www.antiqueradios.com/forums/viewtopic.php?f=6&t=337912

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