Thread: Hum on AM HF receiver
View Single Post
  #3   Report Post  
Old February 21st 08, 09:01 PM posted to rec.radio.amateur.boatanchors
Scott Dorsey Scott Dorsey is offline
external usenet poster
  
First recorded activity by RadioBanter: Jul 2006
Posts: 774
Default Hum on AM HF receiver
Antonio Vernucci wrote:
Most of the strong AM signals received on my National HRO are affected by hum.

I put a ceramic capacitor in parallel to each of the 80-type vacuum diodes with
no noticeable improvement. Does anyone remember which other cure was proposed to
solve the problem?

You sure the power supply filter caps are good?
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."
Reply With QuoteReply With Quote