Valve Audio Detector Impedance

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6B8G @ The Valve Museum

http://www.r-type.org/exhib/abh0024.htm

The 6B8G double diode amplifier pentode was designed for use as the detector and first audio stage in radio receivers. The diodes would be for signal and AGC detection and the high impedance audio pentode would provide good small signal gain for feeding into an output Valve. The pentode is described as semi-vari-μ so that gain can be controlled by the AGC line.

Low Voltage B+ for Valve Audio Amplifiers

https://www.cool386.com/low_voltage/low_voltage.html

for valve circuits, with a turns ratio of 3:1, and an impedance ratio of 10k to 90k CT. It is designed to carry up to 10mA primary current, and has a centre-tapped secondary which can be used to drive a push-pull output circuit. It is available from Antique Electronic Supplyfor around US $15. The P-T156 is an excellent performer.

7C6 @ The Valve Museum

http://www.r-type.org/exhib/aaa1755.htm

Normally such a valve would be used as signal and AGC detector plus first audio amplifier stage in broadcast receivers. This valve is unusual in that the anode impedance is high, maybe this valve was to be used for video demodulation and amplification. The design dates to the late 1930's in America and the UK versions are post-war.

Audio Output Stages - UK Vintage Radio Repair and Restoration

https://www.vintage-radio.com/repair-restore-information/valve_output-stages.html

Audio Output Stages . ... The purpose of the output transformer is to match the high voltage high impedance of the output valve anode circuit to the low impedance of the loudspeaker. ... (for example a UCL82 valve) and the detector diodes are in the same envelope as the final IF amplifier (e.g. UBF89 valve). ...

Progressive Receiver Design - QSL.net

https://www.qsl.net/g3oou/progressiverxdesign.html

An active solid state or valve detector may take the form of: a unity gain type such as the infinite impedance detector a regenerative type such as the reaction detector or super-regenerative type both of which have variable amounts of gain a direct conversion type as discussed below. 3.

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