[Texasrocker]

Loctal tubes pins corrode easily. After scraping them shiney clean, ( I use a exacto knife),.. I then spray a small amount of WD-40 into a small container, dip in a Q-Tip, and then apply it generously to all the scraped tube pins. I also apply a small amount to the tube sockets top side on the chassis. Installing and then removing the loctal type tubes a few times helps assure the sockets connections make good contacts if they are dirty. Adding the WD-40 helps prevent oxidation from happening again in the near future also. Works for me. A oldtimer WW2 Radio tech taught me that trick many years ago.