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Old 13th Nov 2019, 12:13 am   #5
Karsten's Avatar
Join Date: May 2012
Location: Moenchengladbach, Germany.
Posts: 41
Default Re: AVO CT 160 Regulated Grid Voltage Supply

One of the front panel fuses has been rewired in line with the grid potentiometer wiper and fitted with a 32 mA fast blow fuse. This fuse should blow in case of a faulty valve or erroneous roller switch setting. The BC238 transistor is plugged into a short socket strip, not soldered even though the transistor cannot be destroyed by a short in the grid volts network because the 47 K base resistor limits the collector current (beta ~300).
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