Quote:
Originally Posted by Boulevardier
Quote:
Originally Posted by Techman
Just looked at the circuit and the volume control which is a 250K pot is right on the output of the head unit and would actually ground the grid of the first stage (EF86) of the power amp, but it looks like there may be a resistor stopping it doing so.
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Yes, that resistor lifting the pot from ground puzzles me too... |
I have a feeling that the resistors Ra & Rb after the pot are to be set according to which power amp you have connected - 5-10 or 5-20. Think it was something to do with getting the correct input sensitivity. Long time (about 55 or more years) since I read the Mullard book.