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Tek 2213 attenuator switches

Have this old 2213 kicking around which had been sidelined because of dodgy attenuator switches (some positions work fine, some never work and others sometimes work). Finally got around to pulling it apart and found the switches charmingly simple - a barrel with pegs (like an old music box) bearing down on little gold plated leaves contacting gold plated lands on the PCB. Cleaned everything up with IPA then Cramolin, and (full of optimism) put it all back together again. To my surprise it was not a great deal better than before the operation. Anyone know of any tricks that may get me better results ? Cheers M

Reply to
Piglit
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This might help:

1) Turn attenuator to open the contact(s) you are cleaning 2) Slide an IPA wetted piece of white paper in the opening 3) Turn attenuator to close the contact(s) 4) Slide the paper out.

*** *GENTLY* ***

Ed

Reply to
ehsjr

The gold plating usually dissapears after the years. What's left is bare copper which is not suitable as a material for contact. Using contact cleaning agents only makes things worse because these dissolve copper and other metals. The only real solution is to replace the attenuator or fix it properly by having the contacts plated with gold again.

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Reply to
Nico Coesel

Try a small amount of conductive grease.

Reply to
cbarn24050

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