Path: csiph.com!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail From: "chrisnd@privacy.net" Newsgroups: sci.electronics.components Subject: Re: Question regarding the identification of a component Date: Wed, 10 Sep 2025 16:43:49 +0100 Lines: 44 Message-ID: References: <68c0533e$4$10368$882e4bbb@reader.netnews.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Trace: individual.net HjtKnTr6cmvCizow1K4ZLAASPvqvPV+OXPHJCX8RYR2YEovJ6R Cancel-Lock: sha1:tb4U65b/DsNCX0nWhMs3wAfp5xc= sha256:qLJS+i1vpJxzC6WvrZAG9Rwq5cG6Dhzi9Ck5WGrvVQM= User-Agent: Mozilla Thunderbird Content-Language: en-GB In-Reply-To: Xref: csiph.com sci.electronics.components:6598 On 10/09/2025 16:38, Reinhard Zwirner wrote: > chrisnd@privacy.net schrieb: >> On 09/09/2025 21:12, Reinhard Zwirner wrote: >>> bitrex schrieb: >>>> On 9/9/2025 8:38 AM, Reinhard Zwirner wrote: >>>>> Attention: fup2! >>>>> >>>>> Hello, >>>>> >>>>> In an older power supply unit for GM counter tubes, the high voltage >>>>> (max. 1 kV) is generated by a normal push-pull voltage converter >>>>> (switching frequency approx. 8 kHz). In the HV filter chain, this >>>>> >>>>> >>>>> >>>>> capacitor is connected in parallel with the following strangely >>>>> marked component of the same size, >>>>> >>>>> >>>>> >>>>> which my Far Eastern multitester identifies as an 8 nF capacitor. >>>>> That could well be the case, but why the strange marking? A VDR? >>>>> What >>>>> do you think? >>>>> >>>>> Many thanks in advance for your hints. >>>>> >>>>> Best regards >>>>> >>>>> Reinhard >>>> >>>> Maybe "41C" indicates the transition temperature for a PTC? >>> >>> The part behaves in no way as sort of resistor. >> >> Unless it has failed, open-circuit? > > Yes and no. Multitester says: 7,8 nF capacitor. But a capacitor > should just be open circuit, otherwise it's broken. On the other hand > I doubt that a PTC/NTC is connected to ground and a 1 kV line. Sorry, I was still in VDR territory when suggesting open circuit. Chris