Greetings from Havana

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Hello everyone.

I found this forum looking for info about valved amplifier (or should I say tubed amplifier). I have work in electronics for 20 years, but everything I have learned about electron tubes it 's from 3 or 4 month ago. I have always been "transistorized", and now I'm trying to learn something about the "misterious" world of electron tubes.

PS: Being myself a Spanish speaker, I apologise in advance for any spelling or grammar mistake.
 
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