• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

selling used tubes without a tube tester

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#4
I generally sell used tubes in large batches for low prices, most tubes are not worth my time to test. Some types I do a filament/heater continuity test, mostly types my tester does not support. New Old Stock tubes I offer money-back if they do not meet original specs. Some types I do test.
 
#7
I only have a small tote of tubes that I have no plans to use in the future. Some old 6550s, EL34s and a few little ones and a couple new ones; nothing especially rare or crazy valuable. Most have getter that is fading. Probably not worth hassling with at this point; although it would be fun to have the money to play with elsewhere. Someday I should pay someone to test them and get the specs before I forget I have them.

Thanks for the input on it.
 
#9
Put them up in a lot as untested with a starting bid of 1$ plus shipping... You'll sell them.
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More than likely but the chance of selling them for $2 or some other piffling sum is there, which is vexing.

The only way to make sure you get a reasonable price is to test them, an emission test will do as artosalo points out. Five minutes with a soldering iron a few transformers and other bits and pieces & Bobs your proverbial Uncle. That or stick em in an amplifier, an easy way is to tack a 10 ohm resistor between the OPT and anode/plate. Read off the voltage divide by 10. List test conditions on your description.

Andy.
 
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