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Author Topic: 811h strange noise  (Read 1800 times)
N4JTE
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Posts: 1158




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« on: July 24, 2011, 06:25:14 PM »

Lately been hearing what I can only describe as a noticable whistling noise when under load. Fan appears to be working fine, does not seem to be area from where it is coming. Using 572b's, in grounded grid. Will open up and clean tommorow but wandering if someone has a clue to this, it does clear up after a little while, but disturbing.
Tnx,
Bob
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W1QJ
Member

Posts: 1459




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« Reply #1 on: July 24, 2011, 07:45:05 PM »

sometimes a leaky filter cap when it gets hot blows off some liquid and might make a whistling sound. Not saying that is your problem but something to consider.
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W8JX
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Posts: 6075




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« Reply #2 on: July 26, 2011, 07:03:11 AM »

Check and see if it varies with band selection. If so you have some parasitic oscillation.
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All posted wireless using Win 8.1 RT, a Android tablet using 4G/LTE/WiFi or Sprint Note 3.
N4JTE
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Posts: 1158




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« Reply #3 on: July 26, 2011, 08:20:03 PM »

Tnx guys, reset all caps and blew out with good ole compressed air, probaly clogged up with cat hair, hi.
Good to go, tnx
Bob
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W1QJ
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« Reply #4 on: July 27, 2011, 01:26:47 AM »

What does reset all caps mean?
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N4JTE
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« Reply #5 on: July 28, 2011, 11:02:53 AM »

Take off and put back on.
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W5DQ
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« Reply #6 on: August 02, 2011, 01:01:24 PM »

Take off and put back on.

Appears he's talking about the plate anode ceramic connection caps not filter CAPACITORS  Huh
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Gene W5DQ
Ridgecrest, CA - DM15dp
www.radioroom.org
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