[R-390] Cleaning the Megacycle bandswitch

[Guido Santacana]

What I have done to clean the switch in the rf/crystal deck is to go over it carefully with a camel hair brush dipped in Deoxit. This is done just before returning the RF deck to the main chassis. When everything is back in its place I move the switch through all bands. It has worked for me.

73s

Guido KP4FAR

Sent from my iPhone

> On Oct 10, 2018, at 9:37 AM, dog <agfa at hughes.net> wrote:
> 
> It appears that the gain in my 390A will change over time. I've tried changing tubes to no avail. Then I noticed that if I rocked the Megacycle Change the gain goes back to 'normal' and stays there for a while. It's also noisy changing bands. What is the recommended procedure to clean that switch?
> 
> Dave
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