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 Post subject: Gulbransen model 60 chassis safety cap
PostPosted: Feb Fri 09, 2018 1:46 am 
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Joined: Jan Wed 17, 2018 8:59 pm
Posts: 11
I have been told to use a y2 safety cap for c-17 on the wiring diagram. I cannot find a good replacement for this. A suggestion would be great. Thanks!


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 Post subject: Re: Gulbransen model 60 chassis safety cap
PostPosted: Feb Fri 09, 2018 4:57 am 
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Joined: Jan Mon 16, 2012 4:15 pm
Posts: 3847
Location: Near Brandon, Iowa
You can purchase the needed cap from this supplier:

http://www.justradios.com

Your info is correct- the replacement cap should be a type Y2 "safety" cap.


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 Post subject: Re: Gulbransen model 60 chassis safety cap
PostPosted: Feb Sat 10, 2018 1:54 am 
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...Sal, Digikey, and Mouser have them too...

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 Post subject: Re: Gulbransen model 60 chassis safety cap
PostPosted: Feb Sat 10, 2018 2:24 am 
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Joined: Jun Fri 19, 2009 6:34 pm
Posts: 7415
Location: Long Island
The schematic calls for a 0.02-uF, 750-VDC capacitor, and yes a Y2 or an XY2 cap is appropriate here. You should keep the same capacity (0.02-uF) as it probably protects the on/off switch from arcing when the contacts open, in addition to putting the chassis at RF ground. The new Y2 capacitor will be rated for 250-VAC which is a modern rating system that tells you the maximum line voltage the cap should be used on. If you dig up a spec sheet on it, you'll see that Y2 caps are tested to much higher voltages.

Any good quality X or Y type capacitor will have manufacturers' ID or certifications marked on it that identify which standards it meets. It's important to check for this, otherwise the cap might not really be what you think it is. See https://www.allaboutcircuits.com/technical-articles/safety-capacitor-class-x-and-class-y-capacitors/ for further info.

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