[Jmeulemans]

Hoping someone can help with this issue. I have a 38-10 xf that I recapped and tested the existing tubes but failed to notice that the 6f6 was replaced with a 6v6. I have replaced the 6v6 twice before I realized the substitute, however my research has shown that a 6v6 is an acceptable substitute in most instances. Is this substitute not acceptable in the 38-10 chassis, or is there something else that I may have missed? All the voltages were within tolerance after the recap and I can not find any shorts. The 6v6 filaments do heat up but fail to produce sound through the speaker and fail on the tester. All other tube continues to test good.