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[Amps] SB220 cooling was: Re: Coupling a blower to an air system socket

To: amps@contesting.com
Subject: [Amps] SB220 cooling was: Re: Coupling a blower to an air system socket
From: Pete Smith N4ZR <n4zr@contesting.com>
Date: Mon, 18 Mar 2013 06:29:25 -0400
List-post: <amps@contesting.com">mailto:amps@contesting.com>
For what it may be worth, I seem to have cured a recurrent problem with overheated filament pins on my SB-220 (which came unsoldered frequently) by putting a muffin fan directly over the tubes, sucking air out of the tube area. The amplifier is used in contestservice at ~1200 watts output on the lower bands and around 1KW on 15 and 10. I had tried all the usual fixes - swapping the socket springs, polishing the pins, adding the Harbach fan - but this appears to have been an essential last step.

73, Pete N4ZR
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On 3/17/2013 2:03 AM, Roger (K8RI) wrote:
I do not know of any way to achieve the required air flow at a reduced back pressure other than an exhaust fan reducing the exhaust pressure thus making it a little easier to get more cooling air through.
I believe Emtron and OM both use this approach on some models.

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