[Hallicrafters] Weber Copper top rectifiers

[Craig Roberts]

The advantage of the Weber Copper Caps (besides looks) is that the 
proper dropping resistors are built in, as is current inrush protection.

Of course, as Peter says, you can fashion solid state devices yourself.  
Dutch Maurer's website has instructions contained within an article 
about converting the Collins 516F-2 power supply to solid state. See: 
http://users2.ev1.net/~wb7dyw/516F.htm

Octal tube bases can be purchased from Tube Depot 
(http://www.tubedepot.com/sk-8base.html) , and the diodes and resistors 
from our friends at Mouser (www.mouser.com).

73,

Craig
W3CRR