[exray]

Nope. It has to be between the antenna and grid. Did the variable cap antenna section check out ok?

You've got me curious now. I have a 37-61 that WAS working. A friend in the UK needed an antenna coil so I sent him mine. He sent me his old one and I repaired it and stuck it somewhere in the shack for later installation. Apparently I have been burglarised since the coil is now nowhere to be found I figured I'd have to make up a toroid coil or something. Did that once on a similar Philco and it worked out ok.

At any rate, your problem is still waiting to be found and I'm fresh out of ideas. I read all the comments about the IF alignment and I take it you have that under control. If you were 20 or 30 kc off on the IF alignment you could experience similar symptoms since that would spoil the tracking. Antenna shouldn't make a difference but just need to ask, you're not attempting to use a directly connected loop or anything like that?

-Bill