Tech Talk

Mains hum Kriesler 11-97
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Return to top of page · Post #: 16 · Written at 2:37:04 PM on 30 June 2025.
	Johnny Location: Hobart, TAS Member since 31 July 2016 Member #: 1959 Postcount: 599
Shorted output and rectifier valves are not a common problem. And can mostly be checked with a tap or two whilst the unit is running normally. Any arcing should be acted upon with a replacement valve. JJ

Return to top of page · Post #: 17 · Written at 7:35:52 PM on 30 June 2025.
	Monaro Location: Brisbane, QLD Member since 24 October 2013 Member #: 1439 Postcount: 150
There sure are some experts on this site! That’s a novel idea to protect the opt’s by using a low power rating cathode resistor - it’s such an easy modification for some insurance…thanks for that contribution I’ll do just that. I’ve actually had a rectifier valve short in my other 11-97; turned it on and heard crackling….lifted the lid & saw the wax bubbling on the main transformer! I shut it off right away, swapped out the valve & worked fine again!

Return to top of page · Post #: 18 · Written at 8:32:19 PM on 30 June 2025.
	Ian Robertson Location: Belrose, NSW Member since 31 December 2015 Member #: 1844 Postcount: 2695
The 6V4 is running right on its limits in that chassis. A 6CA4 is a more suitable direct replacement.

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