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RE: 6BL7GTA / 6BX7GT Section Difference?

Most of the modern versions of these two types have a g1 radiator on one of the sections and none on the other. I assume that the section with the radiator was intended to be the output section and the radiatorless one the oscillator.....but never bothered to visually trace it out to confirm.

Edit: Got curious so checked my stash. Turns out there's a topside g1 radiator on both sections of most versions. There's an additional bottomside g1 radiator on section 1 of Sylvania and GE GTA versions but not necessarily on the plain GT versions. So my assumption that the output section got additional cooling was wrong: it's the oscillator section. Wonder what's so stressful about oscillator service.

Edits: 03/23/17

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