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Valiant padder caps




 
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Author Topic: Valiant padder caps  (Read 341 times)
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K2GTM
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« on: January 03, 2022, 06:54:11 PM »

I'm working on a Valiant that has some blown padder caps (C38A-D).  What cap(s) would be best suited here?  Would a single 150pF 7.5kV doorknob work?

Thanks in advance for your help!
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MikeKE0ZUinkcmo
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« Reply #1 on: January 03, 2022, 10:54:52 PM »

Yes it would but that seems to be a lot of overkill in the voltage department, as the P/L lists them as 500V devices.
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Mike KE0ZU

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K2GTM
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« Reply #2 on: January 04, 2022, 12:34:16 PM »

I did notice that in the parts list, but I was wondering about using a cap that could handle the RF. I have some 3kV and 6kV disc caps I could use, I just don't know about their RF current handling capability. Or, maybe the RF levels are low enough not to worry about it?
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w4bfs
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« Reply #3 on: January 05, 2022, 06:56:15 PM »

circulating current is roughly Q x in/out current of a pi net tuner.  this is aggravated by 100% duty factor of am.  something beefy is needed
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Beefus

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to see ourselves as others see us.
It would from many blunders free us.         Robert Burns
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« Reply #4 on: January 06, 2022, 02:02:35 PM »

Thanks, Beefus.  I found some nice looking doorknobs on eBay that would work, but they're in the Ukraine and will take a while to get here. 
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