Newly Restored Tram C628 Capacitor Problem

[windhund]

My Tram D201 keeps popping C628.

I purchased the radio a few years ago and decided to replace all electrolytic and film capacitors along with high power capability resistors.  In short if I could fit a higher power rated resistor or a higher voltage rated capacitor, it was done.  I really took my time doing this.

All of the tubes are New Old Stock and I still have the old ones.  The previous owner did a power mod with a switch to drop the resistance of R642/R643 and I restored it back to the 2.7k +1.5k = 4.2k as shown on the schematic.

With C628 out of the circuit I measure 90VDC and 0.35VAC at that junction.

Before the cap popped I had removed the neutralizing link and the bias voltages were spot on, -24VDC AM and -32VDC on sideband.

Any thoughts?  It has happened twice and it is the correct 4uF/250VDC part.  

Thank you.

[windhund]

Here is what I figured out.  I noted the polarity of the VOM and guess what?  The cap was installed backwards.  I installed a new one, matching the polarity.  No pops.

The oddball thing is that the schematic shows the Yellow wire going to the + and the White wire going to the -

Mine is reversed.

Now on to the alignment.  It actually "hears" very well on AM already.  0.5uV with no adjustments.