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Any logic behind tube shapes?


Coytee

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I've seen various tubes and pictures of various tubes.  I'm more familiar with the stereo tubes and not so familiar with the broadcast or other types.

 

I notice some are straight sided, some are wider at top, slender down to the bottom, some have a bulge in the middle section, some look to be round like a Christmas tree ornament.

 

I'm just curious is there a functional reason for the various shapes or is that more of an artistic design choice to simply differentiate a KT88 from a 300B?

 

(I'm guessing it has to be aesthetic choices not functional choices)

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I've wondered that myself. You can get 6550 tubes in both a straight tube, like the GE's, or the fatter in the middle tube, like the Tung-Sol's. I'm sure some designs are functionally stronger, but I don't know if it comes into play on stereo tube design. 

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