[R-390] Need AC power cords with round chassis

[Bill Hawkins]

This is the rectangular (flat) connector with 3 round pins
for line power that has rounded ends, predating the
connector that is standard for computers.

The safety ground is always the middle pin.

Hot and neutral may be swapped.

This usually didn't make any difference to the equipment.
It depends on how power was routed to the power switch and
the sensitivity of the instrument to power line hum.
At least, that's been my experience.

Bill Hawkins
 

-----Original Message-----
From: k2cby
Sent: Sunday, April 04, 2010 9:31 AM
To: R-390 Mailman
Subject: [R-390] Need AC power cords with round chassis

I've bought these in the recent past from Mouser.

Hewlett Packard used these a lot.

Mouser Part #:  686-17952  
Manufacturer Part #:  17952 8 B1  
Manufacturer:  Volex  
Description:  AC Power Cords 8' 18AWG 7A NON-STD  

They are presently not stocked with a 2-week backorder time.

NOTE! Be careful to check the pinout. Two versions were made
with the ground on different pins. It may be necessary to 
rewire the receptacle.


Miles B. Anderson, K2CBY
16 Round Pond Lane
Sag Harbor, NY 11963
Tel.: (631) 725-4400
Fax.: (631) 725-2223
e-mail: k2cby at optonline.net