[Amps] Tubes 201

[Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>]

Two questions:
1. In xenon rectifiers such as the 3B28, how pure did the xenon have to be, and 
what was the result of contamination?
2. Early tubes were often deliberately 'soft' because they made better 
detectors. Why? (anode voltages of about 60 volts max were used)
73
Peter G3RZP
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