Follow up.
In this investigation, I happened to purchase a Icom IC-740 cable bundle ( OEM ), from a seller parting out a old
unit.
This is how the discussion continued . . .
Quote -
" Did you know that the switches you sold to me have a manufacturer defect within their composition ?
I was slightly suspecting that this may be the case. This being the first Icom IC-740 I have seen.
I expect their are several with this defect. However, I wanted a fully operable switch and was
willing to pay your bundled set price, in order to save me the time in matching up a after market
switch, with reasonable and acceptable physical connection characteristics which is easily attachable
to the unit. The sale of the PREAMP and +0.5 switches within your bundle, confirm this suspect.
Both of these switches when in the ON position, close their contacts to 0.4 to 0.5 ohms, never to an
expected 0.0 ohm ( true short ) closure.
I did measure your switches using a Simpson 260 VOM. " End Quote.