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Hi
Just had an EH KT88 ruined by poor pin soldering. I was out of my listening room for about ten minutes and when I came back one of a pair was cherried up and glowing bright blue...Ouch! Subsequent examination showed that the control grid pin soldering was faulty. A few moments with hot iron, solder pump, and proper LEADED solder put that right but sadly the tube is ruined. I checked a few more of my stock and a quite few suspect pins showed up. Moral of the story, never trust the soldering on tube pins in these lead free days get your jewellers loupe out and make sure!
Ho hum
Todd
Follow Ups:
I have "fixed" a couple of EH 300B's by soldering the pins. I have also instructed one or two people on how to do this. Oddly enough, it has always been the grid pin that was the issue, which seems rather unexpected.
The grid pin has no current passing thru it to cohere the joint so can easily go O/C and if the grid of a power tube goes O/C disaster ensues..
I got them from UK company Hotrox about 3 years ago, so now long out of any warranty. Other tubes from Hotrox have been fine.
I would be really surprised if the EH tubes were listed as RoHS compliant. More likely just sloppy manufacture. The pin dipper was probably hung over.
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