Quote:
Originally Posted by Tubejunke
I will take a leap and say that it really wont matter whether you use glass or metal from the standpoint of the correct look. You said something about them being kind of cheap, so I guess you mean that you want to keep your costs down. If that is the case, I would think that you will want to go with standard glass envelope tubes as they are going to be more plentiful and much easier to locate the entire compliment needed for your set.
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One thing to bear in mind is that the metal envelope of some octal types provided an integral 'tube shield' effect, and that if you swap an original metal tube for a glass one, loosing that shielding effect may prevent normal operation. Always be weary about replacing metal tubes with glass as the set designers may have made the set to only work with metal tubes in some places.