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: Tue, 9 Sep 2025 22:08:42 +0200 Lines: 46 Message-ID: References: <109pj1j$2frf$1@nnrp.usenet.blueworldhosting.com> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit X-Trace: individual.net LmkLDMi7jMGMYhYin0bwzwZxS4nSHuboeAgHV0clJh+xU= Cancel-Lock: sha1:9+eVvz2Zq6p1E4ZMXAYC99T/wwk= sha256:ETiK95iVc3CTypdxopl+IHkKoZ8KXochv1WtGdtIStE= 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: <109pj1j$2frf$1@nnrp.usenet.blueworldhosting.com> Xref: csiph.com sci.electronics.components:6592 Edward Rawde schrieb: > "Reinhard Zwirner" wrote in message news:mialetF24nnU1@mid.individual.net... >> 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? > > The marking suggests that like the other capacitor it's a Sprague component. > You are probably aware that Sprague was known for capacitors, but that > doesn't prove it isn't a thermistor or surge protection component of some kind. > Image search finds nothing with similar markings. > Try applying some volts and see if you get any amps. Tested the part with a 2 megohm series resistor at 3 kV (with a capacitive voltmeter in parallel): no problem. > Does the converter work without it? Yes. > What was the reason for disconnecting it? To take the best possible photo. > How many of these components are there and what are they connected to? Just this one. One side connected to ground, the other side is connected to the HV line (in parallel with the 10 nF capacitor). Regards Reinhard