![]() Test at standard conditions for a specific tube.The non-grounded deck plate is DANGEROUS. You have to connect am AM radio receiver antenna to the noise test output, and if there is any noise, this will give loud crack sounds on the radio. This seem a nice method, though I must admit never tried it. So regardless if it is gas if leakage, we always call it "gas" when you have a Hickok. This change has always it's limits no matter what causes it. The small voltage will add to the DC bias voltage, and change the bias of the tube. The idea is, that tube gas gives grid current, and this will generate a small voltage over this resistor. This is done with a standard test circuit, by putting a very high series resistor in the grid. Case is rugged and large, leaving us today plenty of room for upgrades.Some Laboratory models have additional tests. The "English" reading with most of the testers. Because of this "standard" circuit, each tester is a good one. Some of the later solid state testers had the same circuit. Micromho (=ma/V) readings, by means of a patented Hickok two-tube circuit which you will find in all testers with some variations.Some have even a separate filament transformer. Have higher generic precision, due to less compromises with the circuitry. ![]() Require more settings, but can also do more. Simplified versions of the large case testers. Large case, with lots of space inside to add extra sockets, or 115V to 230V transformer Has some special features like life-time test. (very uncomplete) overview of Hickok Tube Testersġ. ![]()
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