Is SIA meaning STA, as in 'stations'? The 1R5 should be OK on the broadcast band, but will operate poorly on the higher SW bands.
Deoxit is good stuff, but it can't perform miracles. The switch contacts might have a hard, black oxidation on them. You may have to dismantle the switch and rub the deposit off gently. The contact terminals may be worn and sprung, you may need to bend them together slightly for contact. When actuating the switch, you should see them move ever so slightly, this means that they are touching the contact stem.
Take your time and be careful, the coil rack area and winding leads are very delicate. |
jim 
Doug Criner 