UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

ms660 · 3rd May 2021, 10:32 am

VR1 is a gain control for the RF and IF amplifiers, the cathodes of those valves are connected to the bottom of the RF and IF valves g2 potential divider (30k & 25k) via the 400 Ohm resistor, that ensures maximum cathode bias at the minimum gain setting which is what's needed when using a gram pickup.

Lawrence.

3rd May 2021, 10:32 am	#26
ms660 Dekatron Join Date: Apr 2011 Location: Cornwall, UK. Posts: 13,454	Re: Paillard 768 VR1 is a gain control for the RF and IF amplifiers, the cathodes of those valves are connected to the bottom of the RF and IF valves g2 potential divider (30k & 25k) via the 400 Ohm resistor, that ensures maximum cathode bias at the minimum gain setting which is what's needed when using a gram pickup. Lawrence.