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6H6 Variations 12 variations of the 6H6 tube Photo provided by Robert Deuel

This page was last updated on: December 28, 2004

This photo shows 5 versions of the 6H6 being from left to right as follows: Zenith 6H6G with "ST" envelope Sylvania 6H6G with tall T9 envelope   (note that both G's have smaller diameter bakelike bases) RCA 6H6GT with intermediate T9 envelope Tung-Sol 6H6GT/G with squatty T9 envelope General Electric 6H6 metal envelope

This photo shows four 6H6 metal type ones as follows: RCA Radiotron early "flat top version with getter bump RCA Victor with the common dome top Westinghouse Radiotron with unusual bright metal base collar Heintz and Kaufman "Gammatron" brand with red painted envelope

The photo above shows "ST" versions of the 6H6G with different internal constructions as follows: Hytron with aqua-dag inside the envelope.   (this is the only one I have ever seen with aqua-dag) Zenith with the diodes within the "T" portion of the envelope Zenith with diodes located right at the shoulder of the envelope CeCo with diodes below the shoulder and with supports to the "T"   portion of the envelope Zenith with "GT" style diodes and mica wafers located unsupported   below the shoulder