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Whenever I asked people told me you need a mutual conductance tester, and it's kept me from getting one. I have one that tests heaters I bought it for $5 off eBay a long time ago. What do I look for to find an in between type? I noticed you also helped with my post about the Zenith TV, I want to test the 2 vertical tubes to make sure they are bad, plus I have a Zenith clock radio that keeps burning out tubes and I've replaced all 5 twice. So I'd like to make an educated decision instead of just shot gunning all the tubes everytime.
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