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6LF6 Sylvania branded Zenith NOS 1964 (115ma) (Counterpoint OTL, Futterman OTL, Prodigy OTL)
6LF6 Sylvania NOS 1970 era (98ma) (Counterpoint OTL, Futterman OTL, Prodigy OTL)
6LF6 Zenith NOS 1978 (101ma) (Counterpoint OTL, Futterman OTL, Prodigy OTL)
