[LarryFS]

I'm glad to hear that the heater circuit is ok.  The socket voltage diagram I have shows 6.3 vac at both heater pins; so, I thought something was amiss.

The plate-to-plate voltage with the rectifier tube (5Y4G) removed measured 723 vac.  I'm using a digital multimeter.  The + side of cap 120 (and 121) is 275 vdc; supposed to be 315 vdc based on the diagram I have.  

I'm wondering if I have misconnected something with the new electrolytic caps.  For cap 123A I had installed a 10 mfd rated at 160 volts (with + side going to chassis ground).  The voltage rating on the original can was labeled as 50 volts.  But after a couple minutes of operation, I heard a small pop and saw a wisp of smoke.  That cap had apparently overheated and discharged a small amount of oily residue.  I've replaced it with a 12 mfd rated at 450 volts (closest one I had at higher voltage rating).  I've attached a couple photos showing how I installed the new caps.  I tried to mark on one photo how I interconnected the - sides of 120, 121, and 123 with the + side of 123A.

I noticed that the socket voltage diagram shows a 60 vdc measurement for the 10 mfd at 50 volts cap.  Seems like that cap's voltage rating is too low.

Thanks for taking the time to help me with this!
Larry