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On/off delay for valve amplifiers

LABSPROJECT
Based on a Labs project | October 2011 | Find it here
On/off delay for valve amplifiers
This circuit has been designed primarily for use with valve amplifiers. When the arnplifier is switched on, filament voltage is supplied first and the anode potential a few minutes later. When there has been no input signal for a while, the anode voltage isswitched off agam automatically.
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