[Elecraft] [K3] Why do they still use 1/4 inch phone jacks?

[Barry]

  I presume, historically, it was so there would be enough spacing to 
prevent arcing for the 300VDC on the keying line, etc.  Nowadays, most 
headphones come with 1/8 inch plus, paddles/keyers are low voltage, etc.

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Barry Kutner, W2UP             Lakewood, CO