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Ed_Dinning · 21st Jan 2006, 10:37 pm

Hi Neil, look at your layouts to see that the inputs and outputs are not close together. Look at how you make common connections to chassis (star point earthing is a good idea.
Try the effect of a 1uF paper cap of suitable voltage across the main e-caps. Check what actual value the grid leak resistors are.

HTH Ed

21st Jan 2006, 10:37 pm	#2
Ed_Dinning Dekatron Join Date: Jan 2004 Location: Newcastle upon Tyne, Tyne & Wear, UK. Posts: 8,194	Re: Motorboating Hi Neil, look at your layouts to see that the inputs and outputs are not close together. Look at how you make common connections to chassis (star point earthing is a good idea. Try the effect of a 1uF paper cap of suitable voltage across the main e-caps. Check what actual value the grid leak resistors are. HTH Ed