N_Cook wrote:

I thought standard mains electric wiring pattressed switches were wiping
contacts.


They are not designed to work with low level signals. A switch or
relay made for that application has a pair of gold plated contacts with
a sharp edge, and mounted at 90° angles so you have a high contact
force. This overcomes the contact resistance of the typical contacts in
a power switch. You can cause low level distortion by using the wrong
type of contacts because a very thin insulating layer can form, and this
leaves a tiny dead band at lower levels.


Had to clean out the graphite grease - not high enough ohmage between the
static contacts. Stuffed more plain silicone grease in the ratchet section
and left the contacts area dry well low V, low A switches are usually dry.


Silicon can cause problems, over time. It was banned from all
mechanical telco exchanges because it caused so many problems.


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