05-26-2024, 05:29 PM
Dan
What Steve suggested makes sense: resoldering pins and the cap mean just that, resoldering the pins and the cap, not their wires.
Solder over time, under certain conditions, may develop "cold spot". If it is not that infamous "beta tin", which cannot be melted or soldered with an iron, then you simply need to re-flow the pins and especially the grid cap. Often times you will, upon melting the solder on top of the grid cap, will find out un-wetted oxidized copper wire. At which pont you need to clean it, tin it and reflow with tin-led solder.
No guarantee this is it, but I've seen that too.
What Steve suggested makes sense: resoldering pins and the cap mean just that, resoldering the pins and the cap, not their wires.
Solder over time, under certain conditions, may develop "cold spot". If it is not that infamous "beta tin", which cannot be melted or soldered with an iron, then you simply need to re-flow the pins and especially the grid cap. Often times you will, upon melting the solder on top of the grid cap, will find out un-wetted oxidized copper wire. At which pont you need to clean it, tin it and reflow with tin-led solder.
No guarantee this is it, but I've seen that too.
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