1951 (glass code) Sylvania 6L6G pair as shown.
Strong testing.
Date codes on glass: I1M I1M
Base codes: 226 226
Each tube has a light rattle when shaken.
Test strong at 4200 51 ma & 4400 48 ma where 2400 gm is good at 250 volts
in a Triplett 3444/Westmore 501 laboratory tube analyzer restored and upgraded by Paul Hart.
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