Re: let's bring this back to life Re: Tektronix 453 high voltage problem


John
 

I've tackled a couple of 453 EHT problems. In one case (actually a 454) it was the final HV capacitor (before the CRT anode) which had broken down. In the other instance, it was a thermally-related runaway problem with the transformer. It would take increasing current as it heated up until the -12V line was affected. A third 'scope had a gassy tube, which resulted in a purple glow in the neck and excessive EHT current. You can elimiate this from your enquiries by (carefully! discharge first) lifting the anode output lead and re-powering. Is your scope fitted with 5642 tubes or silicon rectifiers?

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