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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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20th Apr 2021, 11:52 am | #21 |
Dekatron
Join Date: Jun 2009
Location: Staffordshire Moorlands, UK.
Posts: 5,271
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Re: Capacitor identification "RS"
I'm not a fan of those mixed dielectric caps either, I've seen a few go short. I would replace them 'again'. But do it for reliability's sake, I doubt replacing functional ones will make the sound any better.
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Kevin |
20th Apr 2021, 11:59 am | #22 |
Dekatron
Join Date: Sep 2003
Location: Near Swindon, North Wiltshire, UK.
Posts: 3,612
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Re: Capacitor identification "RS"
I have quite a few Dubilier, TCC and Hunts “NOS” paper and mixed dielectric capacitors in my stock/vintage collection and they all have significantly reduced insulation resistance. Even such types fitted in metal cases and “rubber” sealed and crimped over ends are defective in that regard. So, unless “restuffed” with a modern plastic film type, I would never use them in valve equipment or in a circuit position where dielectric losses were important.
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20th Apr 2021, 12:27 pm | #23 |
Dekatron
Join Date: Dec 2007
Location: Haarlem, Netherlands
Posts: 4,199
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Re: Capacitor identification "RS"
Mixed dielectrics don't short or go leaky as often as paper caps, but instead they go up in capacity if the paper part fails. They should at least be measured when encountered.
Last edited by Maarten; 20th Apr 2021 at 12:56 pm. |
21st Apr 2021, 5:31 pm | #24 |
Triode
Join Date: Mar 2021
Location: Watford, Hertfordshire, UK.
Posts: 17
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Re: Capacitor identification "RS"
Thanks guys. Absolute goldmine of info, backed up with personal experiences.
So I will replace them on the following grounds 1. They aren't original anyway 2. I have already replaced the last original paper ones with new yellow ones. 3. On balance they may fail soon or drift away from their spec values. more work to be done, more to learn
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Roger ___________ It's never done that before |
21st Apr 2021, 5:46 pm | #25 |
Dekatron
Join Date: Aug 2007
Location: W.Butterwick, near Doncaster UK.
Posts: 8,932
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Re: Capacitor identification "RS"
Not electrolytic and they certainly fail and have done for a few years now, certainly in "Boost Cap" positions in TV's.
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