[ARC5] PS Hum in BC-453-B (solved!)

[Bill Cromwell]

Hi,

It's hard to imagine how this thread has lasted. I posted my results 
going to an all battery DC power supply that still exhibits very slight 
hum to point out that the AC supplies may not be the entire source of 
hum. virtually all of the posts reinforced the same thing. I did get 
relief by using batteries and I will probably continue that. But I am 
also going to "improve" my AC driven power supplies. So far I have not 
disassembled either of the Q5ers to do anything like shorting a tube pin 
to ground. I already have the needed relief so those tiny little screws 
are going to stay put until I *must* remove them. Maybe some day that 
faint hum that I can only hear when I am not trying to receive will have 
to go. But not today.

Moving on to the antenna connector...

73,

Bill  KU8H



On 01/30/2015 03:25 PM, Roy Morgan wrote:
> On Jan 30, 2015, at 10:44 AM, Bill Cromwell <wrcromwell at gmail.com> wrote:
>
>> The OP is still very much in the conversation which is still about hum in the audio output….The hum I have is not a real problem but it is still there and so I have pointed it out. Possibly a small amount (it *IS* small) is being picked up on my (external) wiring. It won't be hard to determine. Caps and twists - enter stage left.
> An interesting test to find where the slight hum is in the system would be to short the audio tube grid to ground while listening carefully.
>
> Roy
>
>
> Roy Morgan
> RoyMorgan at alum.mit.edu
> K1LKY Since 1958
>
>