Re: PKA 500 HUM

[Tobyp]

I have an Astron 35M which does this.  I placed two heavy books on top of the cabinet,  and this quietens it down.   Keying in cw makes it much worse.

I think I will postpone getting the KPA 500 until this is solved.

The amp uses a linear supply,  which is good,  but if the transformer is not insulated  (isolated ) properly it can be a night mare.  

Toby   W4CAK
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[Leigh L. Klotz Jr WA5ZNU]

I've had mine for a long time, and I've heard it hum twice, and never when I've been using it.
I'm not sure it's worth postponing an order for.

[Johnny Siu]

Hello OM,
 
For those who suffer from 'hum' (I solved my problem already), please contact [hidden email]
 
Gary and his colleague will always be glad to help.

TNX & 73,


Johnny VR2XMC


________________________________
從︰ Leigh L. Klotz Jr WA5ZNU <[hidden email]>
收件人︰ [hidden email]
傳送日期︰ 2011年09月28日 (週三) 12:17 PM
主題︰ Re: [Elecraft] PKA 500 HUM

I've had mine for a long time, and I've heard it hum twice, and never when
I've been using it.
I'm not sure it's worth postponing an order for.


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