In Reply to: update posted by vinnie2 on August 1, 2017 at 14:13:12:
You are getting good advice from a lot of guys who are much more knowledgable than I, but your comment about a difference in gain makes me wonder whether you are attending to not just which pins subserve which "side" of the tube but also which pins are attached to the plate, grid, and cathode of each section, respectively. Any good tube manual should show you a diagram of the pin arrangement in which the function assigned to each pin is labeled. You could possibly get the very different results you hint at if, for example, the plate and cathode pins for one side have been wired up backwards (plate circuit to cathode pin, cathode circuit to plate pin). So, you might want to double check that. Any error in wiring will of course make a huge difference in the result.
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Follow Ups
- plate-grid-cathode - Lew 16:14:23 08/01/17 (0)