Re: 60A225 power/tone switch
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Emil You didn't mention checking to see if the ON / OFF switch rivets are high impedance thus causing the switch to be permanently open.? You could connect an ohmmeter to the line cord? plug and use a pick to probe the switch solder lug / rivet mechanical connection to see if you can read a low resistance on the ohmmeter.? A little solder goes a long way to make a good contact between the rivet and the solder lug.? Been there, done that. Jim Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy
The switch action is erratic. Contact cleaner has had no effect.?
I could jump the contacts and plug the radio in to a power strip,
but if there's an organ donor radio out there with a good switch,
I'd like to find it.
73, Emil? de WD4SCZ
On 5/17/2025 11:44 AM, Jim Whartenby
via groups.io wrote:
Emil
Does the switch still
"click" when turned to the OFF position?? If so, take a
close look at the switch solder lugs on the switch wafer.?
There should be a rivet on each solder lug that connects to
the internal switch contacts.? Ohm the rivet to rivet
connection to see if the problem is actually corrosion of
the rivets causing them to be insulated from the solder
lugs.? Soldering was earlier suggested for tube sockets that
have ground rings that are also riveted to the chassis.?
Clean and solder the rivets to the tabs as necessary.
If this was not the
problem, try spraying some penetrating oil into the switch
body and exercised the switch several times.? This also
works to eliminate a scratchy volume or tone control
resistive elements.
Regards,
Jim
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Jim Whartenby