UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Effect of using lower resistance Volume Control?

'LIVEWIRE?' · 25th Oct 2007, 9:29 am

I really should KNOW the answer to this, but can't remember. What would result, apart from lower max. volume, from using a 220K Volume Pot. instead of a 1M one? I have had occasion to do this in a Vintage Valve Car Radio, which used a special type of dual concentric control(!M Log Vol + 1.3M Lin Tone), and the only item I had which would physically fit was a similar control for a later model, but 220K Log + !M Lin. The set in question uses A.C. Coupling tto the grid of the 1st. AF Stage. Would reducing the value of the Grid leak resistor(5M6) improve the gain?

25th Oct 2007, 9:29 am	#1
'LIVEWIRE?' Rest in Peace Join Date: Mar 2006 Location: N.W. Oxfordshire(Chipping Norton) Posts: 7,306	Effect of using lower resistance Volume Control? I really should KNOW the answer to this, but can't remember. What would result, apart from lower max. volume, from using a 220K Volume Pot. instead of a 1M one? I have had occasion to do this in a Vintage Valve Car Radio, which used a special type of dual concentric control(!M Log Vol + 1.3M Lin Tone), and the only item I had which would physically fit was a similar control for a later model, but 220K Log + !M Lin. The set in question uses A.C. Coupling tto the grid of the 1st. AF Stage. Would reducing the value of the Grid leak resistor(5M6) improve the gain? Last edited by 'LIVEWIRE?'; 25th Oct 2007 at 9:34 am.