Quote:
Originally Posted by turretslug
the soldering at the end of the hollow pins may have been both cursory and minimalist.
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That is a good way to put it. Some I have seen, the soldering itself only coated or tinned the cut cross section of the wire, presumably it was cleaner there and connected to very little of the length of the wire's surface. Then with heating and cooling the wire ultimately disconnects itself or goes intermittent. I had a 6J5 once where its heater would go on and off at times because of this.
The same soldering defects can also occur on plate and grid top caps. One radio I owned with a 6k7 in the IF had an intermittent grid connection here, it took weeks to find what the cause of the trouble was the very first time I encountered it.