Hallicrafters S-20R

[bob91343]

I have inspected and scrubbed the bandswitch and think it's okay. Further, if the switch were damaged I would expect it not to connect the coils but it's doing that.

I guess I need to check for resonance and find out why it's not happening. The rf coils are such fine wire that I wouldn't expect it to damage the switch; the one for band 1 is 38 AWG, almost fine enough to burn out from current from an Ohmmeter. And I don't think the problem is in the primary of the RF coils; I feel the secondary is where my difficulty lies. I may try to pull the rf tube and send signal into where its plate connects to see if I can get energy transfer. Oh where is Bill Halligan when we need him? Did you know he started Radio Shack?

[hvlee]

I don't know how relevant this is since you're measuring a short, but I've only been able to get my S-20R to work with the 6K8 that came with it. I've tried others, both glass and metal, but only this one works. One of these days I'll be in trouble if this one fails and I can't find another which works.

Also, I had a problem with the bandswitch after cleaning with DeoxIT. Apparently I had created a bridge somewhere on the switch either conductive residue or a piece of something came loose. After seeing a bunch of warnings about DeoxIT, I've started spraying band switches with carburetor cleaner and then compressed air to remove the DeoxIT residue. This has cleared up a number of problems for me.

Harry, KT4AE
Maryville, Tennessee