Philco 84

[7estatdef]

(04-09-2012 02:56 PM)Jim Dutridge Wrote:  

(04-08-2012 09:58 PM)7estatdef Wrote:  

(04-08-2012 04:08 PM)Jim Dutridge Wrote:  Well now I'm bummed. The oscillator coil has both windings open. This will take some patience.

Are you sure? You know one of the lugs is a dummy. Use your ohm meter with one lead connected to the bracket, the other touch to the lugs. If the coils are good should show resistance on two lugs. If it show resistance on one probably the feedback winding is the open one. Never seen one with both open. Is a first time for everything.
Terry

Yep, both coils read open to the common lug. I unwound them and both had the dreaded green disease. Primary is a 17 turn winding while the secondary is a 93 turn winding. The open in the secondary was about 60 turns in.

I did have that problem with a model 600 awhile back. It was a pain as the wooden form on that set is about half the diameter of the 84. Ron's sez most of those coils are wound with 38G wire. That darn stuff is pretty small. To wind that coil I ended up using two pair of reading glasses and a luxo lamp..
Have Fun!
Terry