[georgetownjohn]

Happy Thanksgiving all!

I have made a real bonehead mistake this time. Hope someone can help.  I am trying to determine where this wire in question will connect bak to when I reistall the RF unit.  I had numbered it but forgot to note where I removed it from.  As you'll see from the 2 attched photos(the best I could do), the wire in question is connected to pin 8 of the 6A8G and that pin is also strapped to pins 7 and 8.  That wire is hard to see but it is yellow and at the very top right hand corner.  While I am still a novice, I determine pin 8 as the first pin to the right of the keyway counting clockwise as viewed from the bottom. Unfortunately, I am just not sharp enough yest to determine where that wire should connect to in the chassis.  It almost looks like it should go to a ground point but I am not sure.

[RodB]

You haven't given us the model number of the set so I looked up the 6A8 pin assignment. Pin 8 is the cathode and pin 7 is a filament connection. Check your schematic and you'll probably find the cathode is grounded and so is one side of the filament.

[georgetownjohn]

Sorry, it is a Philco 37-640.  Does that help?--John

[radiorich]

Hello John,
I have been there either label got lost or was not labeled !

Sincerely Richard

[georgetownjohn]

What does the dotted line representing that surrounds the tube in the schematic?

[RodB]

I was correct with the 6A8 pin connection's, 7 and 8 are connected to ground as well as the tube shield (the broken line surrounding the tube in the schematic). If the 6A8 is a metal tube then pin 1 Wil be connected to the metal shield and should also be grounded.

[georgetownjohn]

Maybe this is starting to make some sense in my hard head.  Is this why the wire in question was not in the great Ron Ramirez video of 37-640 of the wires to disconnect the IF unit?  My 6A8 tube is a metal one and maybe his was glass.  Does all this mean that I could connect the wire in question to any ground point?  Perhaps my radio is a later production run since it also has aa Muter variable resistor for a bias instead of the large tubular Bias Resitor--Thanks John

[RodB]

Those are details better left to the ones who know. Maybe you disconnected the wrong end of the wire.