Here is Federal Express's How To Pack document.

Packing a whole Philco 40-150 wood cabinet radio.

This is the radio packed. I put extra packing materials (paper or small bubble wrap) inside the cabinet, placed the power cord inside so the owner will have to remove the back to get the power cord. They should see the extra packing material on top of the tubes.	three inches of bubble wrap in the bottom	Place radio wrapped in 2 to 4 inches of bubble wrap. A piece of cardboard has been cut and positioned over the speaker grill and glass dial scale.
Three inches plus the two inches of bubble wrap.	Check all the sides. This shows a little less than three. But there is two to three inches of bubble wrap taped around the radio.
	Pack tight with peanuts or more bubble wrap. Make sure you put a little more than what you think you need. This will compensate for settling.	There is no concaved/inward droop of the top flaps. The top is puffed out a little. That helps confirm you put enough packing in the box. 30# ready to go to the post office or other shipper. Insured of course.

Protect the glass. Not seen is the packing above the tubes to keep them in the sockets.

Add protection for the open back.

Place in a trash bag to keep dirt and peanuts out of the chassis.

More bubble wrap then into box 1.

Box 1 in a bigger box 2 with peanuts.

Slightly over fill with peanuts to compensate for settling. 18x18x17 at 24 lbs insured for $1000.

It appears that Bubble wrap is best.

	That is Straw.		That is two blocks of wood.
The wood wrapped in Plastic wrap. The wrapped glass is sandwiched between the wood. The only change I would suggest is to use wood that is at least 1/8 inch larger than the glass. The glass is sticking out beyond the wood.	The Straw protected the protruding glass.		Plastic wrap around paper covered glass.
Nice!	Great condition.	This is the fellow from whom I purchased this glass.

This wooden box should protect the dial glass.	The joints are glued.	Bubble wrap used to keep anything that comes loose from bouncing around.
The top is NOT glued.	Four bottom screws secure the chassis to the box.	The box is wrapped in three inches of bubble wrap. This should absorb any shock and allow for deceleration and decreased shock to the chassis and dial glass. But as you know this is no guarantee of a safe delivery. The speakers have also been wrapped and set parallel to the box. A fresh new double wall heavy duty box was used.