08-26-2013, 04:10 PM
7C6 is shown as a "preferred" substitute for 7B6, but the characteristics are slightly different, and the 7C6 uses 0.45 A of filament current vs. 0.3 A in the 7B6.
7A7 is a sub for 7B7. 7B7 uses half the filament current as the 7A7 (0.15 A vs. 0.3 A), but the characteristics are otherwise nearly identical.
7A7 is a sub for 7B7. 7B7 uses half the filament current as the 7A7 (0.15 A vs. 0.3 A), but the characteristics are otherwise nearly identical.
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Ron Ramirez
Ferdinand IN