Path: csiph.com!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail From: Reinhard Zwirner Newsgroups: sci.electronics.components Subject: Re: Question regarding the identification of a component Date: Wed, 10 Sep 2025 17:38:26 +0200 Lines: 41 Message-ID: References: <68c0533e$4$10368$882e4bbb@reader.netnews.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Trace: individual.net aDx46Z+R0O06zyJbcofPCgcnw5vAEQVR746ZcwcDFSUPg= Cancel-Lock: sha1:apXoWptqv4Pxy5ceIapVyjyt5E0= sha256:1xk9xIoXaEpBdQ1sAX+FRWyUGRzYXT5vcigPrjm9IdE= User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:128.0) Gecko/20100101 Firefox/128.0 SeaMonkey/2.53.21 In-Reply-To: Xref: csiph.com sci.electronics.components:6597 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. Reinhard