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Seller Store hickok_meters
(1610) 100.0%,
Location: Kirkland, Arizona
Ships to: US,
Item: 274233587985
All returns accepted:ReturnsNotAccepted
6DC8:6DC8
Country/Region of Manufacture:United Kingdom
Type:Vacuum Tube
MPN:EBF89
Mullard:Mullard
2 NOS Mullard EBF89 / 6DC8From a bulk case with no boxes & same Production Run Matched Pairs The Hickok 750 uses the 6000 scale to test EBF89 tubes for Gmand the A scale for diodes Mutual Conductance (Gm) and Plate Current (mA) Pentode Gm = 2900 and mA 13.3 in pic 3 & 4 Diode 1 pic 5 Diode 2 pic 6 A NOS EBF89 pentode should test for Gm on average at 2900 The minimum usable is 1800 No shorts or leakage, No Noise, No Gas and passed life test with no movement Strong Stable Tubes1 tube tested in pics for example and all tubes tested prior to shipping Free Shipping in 48 Contiguous USA Life Test: Why it is important!Especially with USED Tubes! For tubes with Mutual Conductance (Gm), the life test reduces the cathode temperature to determine the tube?s life reserve. Many tubes can test good, well above the minimum Gm, but fail the life test which means the tube should be rejected. If the tube has a large life reserve, the meter will deflect very little, or not at all, which means the tube will perform satisfactorily. According to Hickok, Sencore, and other brands of tube testers, if the meter deflects downward out of the good sector, the tube should be rejected and will not perform satisfactorily. We have many tubes that test good, but once the life test is made, it reveals the tube has little to no life reserve and is rejected. When we perform the life test and the meter deflects downward more than one or two meter divisions, but may still stay in the good sector, we still reject the tube since this shows the life reserve may be too low to last as expected. We would not sell this tube. Many other testers, including the Amplitrex, only reduce the filament voltage on a life test for a tube with Gm. Reducing the cathode temperature by a specified percentage to determine the tube’s life reserve is more dependable for tubes with mutual conductance to determine a tube’s life reserve. Many of the better quality Hickok and other testers employ this method rather than just dropping the filament voltage down one division, e.g. from 6.3 to 5.0, and has a dedicated “LIFE TEST” switch on the tester. Rectifier Tubes have no mutual conductance (gm). The life test on rectifier tubes is made by reducing the filament voltage, and if the meter deflects downward more than 25% the tube should be rejected (per Hickok, Sencore, Et al). If a rectifier tube dropped 25% during the life test, we would not sell the tube. A strong rectifier tube with a large life reserve will usually deflect up a little and come back to the original test result. We have many 83, 5Y3, and other rectifiers that test as good as NOS, but when the life test is made, it reveals the tube has questionable, or little to no life reserve, thus will not perform satisfactorily. Normal 0 false false false EN-US X-NONE X-NONE
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