[keith49vj3]

Radiohound, I'm not very good at troubleshooting but these are the resistance readings I get for all of the tubes on my 610.  These were all measured to chassis ground.  If I  made a mistake someone will probably let me know.  The radio does play well so that's a good sign.  I don't think Philco published tube pin resistance readings for this radio.
Keith
80 tube
Pin1  85K
Pin2  393 ohms
Pin3  402 ohms
Pin4 85K

6A7 tube
Pin1  0 ohms
Pin2 86K
Pin3 51K
Pin4  108K
Pin5 51K
Pin6 320 ohms
Pin7 0

78 Tube
Pin1  0 ohms
Pin2  88K
Pin3 51K
Pin4  4 ohms
Pin5  392 ohms
Pin6  0 ohms

75 tube
Pin1 0 ohms
Pin2  287K
Pin3 467 ohms
Pin4 467 Ohms
Pin5 0 ohms
Pin6 0 ohms

42 tube
Pin1  0 ohms
Pin2 87K
Pin3  87K
Pin4 517K
Pin5 0 ohms
Pin6 0 ohms