SB200 Linear Amplifier - Soft Key Circuit & Wafer Switch Cleaning

[@dwtees]

I used tarnex silverware tarnish remover with a q tip then rinsed off the tarnex residue by flooding it with deoxit. Worked great. Tarnex and q tip removed all of the 6o years of tarnish from my SB-220's wafer switches and now I have bright silver contacts again. The lubricant in the deoxit will also rehydrate the phenolic switch material. My wafer switches look like new.

[@TubeRadiosRule]

I'm refurbishing an SB-200 I got on EBay years ago, installing a new power supply board, a Harbach "soft start" module, and a soft-key circuit. Can you still use the amp with older transceivers, with the soft-key unit installed?

[@mefedler]

The answer is yes. The soft-key works with both newer and older transceivers. The mod just makes the amplifier safe to use with newer transceivers which cannot tolerate the high voltage or high current of the original design.

[@boxingday11]

Keep the films coming. Regards,Carl.

[@langhilau]

That is way to much De-Oxit for use on a phenolic switch

[@w1jim]

It looks like it's a ceramic switch - which won't absorb the DeOxit.