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UL84 (UL84)

Jacob Roschy Martin Renz Ernst Erb Bernhard Nagel Eilert Menke 
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Forum » Valves / tubes - Semiconductors » VALVES/TUBES / SEMICONDUCTORS in RADIOMUSEUM » UL84 (UL84)
Paul E. Pinyot † 2013
Paul E. Pinyot  † 2013
USA  Articles: 187
Schem.: 19
Pict.: 154
09.Aug.11 21:47

Count of Thanks: 12
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I tested the tube in a Heathkit IT-17 emissions tester with the 6CW5 but with 50 volts filament switch setting. 

This tube does not test properly as a 45B5 (from a 1972 Howard W. Sam's & Co., inc.,  Tube Substitution Handbook). The setting for the 45B5 are different than the 6CW5 and result in a false short indication.

Jan Terranea
Jan Terranea
NL  Articles: 62
Schem.: 71
Pict.: 112
10.Aug.11 12:13

Count of Thanks: 7
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According to the AVO valve data manual all these tubes should be tested with pin 1-6-8 not connected.  The use of these pins is  different by some manufacturers. Shortage may happen if one of these pins is connected to minus HT.