#16
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Heck, although I do play guitar and have one tube amp, I don't expect to be worried about any EL-34s soon if ever. My Epiphone is circa late 50s. No octals; just miniatures.
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#17
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All that said, when the EL34 was introduced in North America, in the 1950s, it was called the 6CA7, under the American naming convention. It's exactly the same tube, just under an American title. Other examples exist, for example EL84 = 6BQ5 ECC83 = 12AX7 GZ34 = 5AR4 And on and on and on All are european tubes with American designations, probably to make them easier to sell and categorize in existing US inventory systems at the time. |
#18
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I never used to test tubes until I got bit in the butt by a shorted tube burning up something a couple of times. Nothing like watching your work go up in smoke. If I have something that hasn't been run in the recent past I test the tubes, not really for emissions but for shorts.
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#19
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Yep, shorts and gas are handy tests to have. I suspect that back in the day, when tubes were plentiful and there was not a finite and ever shrinking supply like there is today, that it was easy to test em and replace if weak. Like replacing your tires when they still have a little tread left. If there were no more tires being made we wouldn't toss them until they were unrepairably flat. If a service shop was working on a radio or TV, they'd replace weak or bad ones.
This probably explains why there are boxes of old used tubes in attics and basements that still test weak or good.
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