High Amplification Factor
ECAUSE a valve of high amplitication factor is inserted in the ®.F. sockets of a multivalve receiver, is no indication that the signals will come in stronger. Rather, in the majority of cases, the reverse is the case. A high amplification factor valve usually has a high impedance, and this high impedance does not match the coil in the anode circuit of that valve and the losses are greater then the gains. Also, by changing the valves, neutralisation is affected and the set becomes unstable as a consequence. Use only those valves for which the receiver is designed.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19290405.2.72
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Radio Record, Volume II, Issue 38, 5 April 1929, Page 30
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101High Amplification Factor Radio Record, Volume II, Issue 38, 5 April 1929, Page 30
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