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Stewart · 8th Mar 2006, 6:25 am

I had this exact same problem on one of my VHF64s - and as Setappeal says it was due to chassis members not making good contact with each other. I found this out by connecting a probe to the negative of the main electrolytic and moving around the various points that should be "grounded". An resistance check failed to reveal the problem - but this method did! If I remember correctly it was one of the side chassis panels that was not making good contact - even though it looked clean and secure.

Once attended to the set runs alomost silently! Good luck!

Stewart

8th Mar 2006, 6:25 am	#3
Stewart Retired Dormant Member Join Date: Jul 2003 Location: N.E. Surrey, UK. Posts: 361	Re: Low hum on a Bush VHF64 I had this exact same problem on one of my VHF64s - and as Setappeal says it was due to chassis members not making good contact with each other. I found this out by connecting a probe to the negative of the main electrolytic and moving around the various points that should be "grounded". An resistance check failed to reveal the problem - but this method did! If I remember correctly it was one of the side chassis panels that was not making good contact - even though it looked clean and secure. Once attended to the set runs alomost silently! Good luck! Stewart