[Elecraft] OT power supply question

[Tom Hammond]

That 'thudding' is the transformer going "Ugh" during the first half-cycle 
(or full-cycle) of AC which it's trying to charge the completely DIScharged 
electrolytic in the supply.

My Astrons all do that was well.

73,

Tom   N0SS

At 11:31 AM 12/16/04, you wrote:

>I use a Pyramid power supply.  PS35G to be exact.  Sometimes when I turn 
>it on it makes a thudding sound.  But it works fine and it doesnt do it 
>all the time.  I am not the original owner and Ive had it for a couple 
>years so I know its getting pretty old by now.  Wondering what would make 
>that noise.  Kinda sounds like someone hit a metal box with a mallet best 
>I can describe it.
>
>WT5Y
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