Two dual diode pentodes:
1. The pentode section of this valve which had a semi-remote cut-off characteristic was primarily intended for use in radio receivers as an intermediate frequency (I.F.) amplifier, the diode sections were used as signal detector and automatic volume control (A.V.C.) rectifier. The pentode section was also frequently used as the first audio stage. 2.5 volt indirectly heated cathode.
2. The 2B7 and 6B7 were the first double diode pentodes to be made, combining the functions of IF amplifier, signal detector and AVC rectifier in the one valve. The pentode section has a semi-remote cut-off characteristic. 2.5 V indirectly heated cathode. Manufacturer: Hygrade-Sylvania Corporation, PA, USA.

Physical Description

1. Shouldered glass bulb with top cap and American style small 7 pin base mounted on display block. 2. Shouldered bulb with small seven pin American style base with top cap.

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