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In Reply to: RE: Gold pins posted by marlin on February 17, 2021 at 06:23:56
Good question. I don't know for sure, but maybe the logic was that you'd change power tubes more frequently than small signal tubes. It was originally done for corrosion prevention, so tubes that don't get changed often would be where gold is used.
Just my 2 cents worth.
Follow Ups:
Gold is only good when both sides of the connection are gold, otherwise you have accelerated corrosion due to dissimilar metals.
Well stated...galvanic corrosion.
Gold pins are best for very low voltages such as preamp tubes in the millivolt range. Power tubes use at least 10 volts at the grid.
Larger pins for the 300B, and such, whether hollow or solid are often 'barrel' plated - where they are tumbled and rotated in the plating solution, like a coffee roaster. So the entire part is plated. Since the amount of gold on each part is so thin, it's cheaper than having machinery/fixtures to just plate one side.
Good point, Vic.
So, a marketing gimmick then?
I mean they do look cool.
I would say yes, but then - I don't work in marketing. :)
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