tansis
New Member
It's been a few weeks since my last bout of cranial anarchy so I think another brain teaser is in order, well more of a quest this time.
Delving into the history of the transistor and semi-conductor theory one will find repeated references to the work of Robert Pohl and Rudolph Hilsch. Now back in 1938 they claim to have created a three electrode (Potassium Bromide) crystal amplifier, with a reputed current gain of 100 to 1 and some rather curious operating properties, however its performance made it unsuitable for many uses such as RF and audio amplifiication, so it was banished to history, well almost.
What I would like to know is..
Has anyone managed to build a duplicate device in more recent times?
Delving into the history of the transistor and semi-conductor theory one will find repeated references to the work of Robert Pohl and Rudolph Hilsch. Now back in 1938 they claim to have created a three electrode (Potassium Bromide) crystal amplifier, with a reputed current gain of 100 to 1 and some rather curious operating properties, however its performance made it unsuitable for many uses such as RF and audio amplifiication, so it was banished to history, well almost.
What I would like to know is..
Has anyone managed to build a duplicate device in more recent times?