Interesting. I wonder if these are "real" 6ez5 tubes because they don't exhibit any glow on the plate when I power them with the 5u4. Everything I've read says that the 7c5 really is a 6v6 and I have to use the 5y3 to run them without glow.
I am planning a push pull 6v6 amp to be built for me so thanks for the warning! I will make sure there is enough headroom to use real 6ez5.
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