In the preamplifier, the terminal 9 is connected to a gate electrode {TAIL ~ g} which acts as a control electrode of {HEAD ~ a voltage controlled transistor} 12 which is in the form of, for example, a field effect transistor, and to a terminal 13 of a resistor 14 
In the preamplifier , the terminal 9 is connected to a gate electrode { TAIL ~ g } which acts as a control electrode of { HEAD ~ a voltage controlled transistor } 12 which is in the form of , for example , a field effect transistor , and to a terminal 13 of a resistor 14
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH