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Re: [Amps] SB-220

To: Amps@contesting.com
Subject: Re: [Amps] SB-220
From: "Dan" <dpipes@earthlink.net>
Date: Mon, 27 Dec 2004 07:53:02 -0700
List-post: <mailto:amps@contesting.com>
Richard & others...

How does the Ameritron 811H fit into this same questions thanks
Dan
==


*********** REPLY SEPARATOR ***********
On 12/27/2004 at 6:48 AM R.Measures wrote:
>On Dec 27, 2004, at 2:33 AM, Larry Stowell wrote:
>
>> I have a SB-220 and am wondering if it is better to turn it off when 
>> its not going to be used for a couple of hours? I turn my radio's on 
>> early morning and leave them on most of the day.
>
>The good thing about leaving a SB-220 on is that it has a reasonable of 
>filament-V, so not much emissive life will be wasted by wasting the 
>electricity. The bad thing about starting a SB-220 is that the inrush 
>current caused by the C-filter exceeds the peak-I rating of the ON-OFF 
>switch, which will eventually cause the switch to fail. For longest 
>life, install a step-start such as the one at Figure 1 on my Web site 
>and oil the fan bearings every two years.
>- cheers, Larry
>>
>> Larry K1ZW
>> Durham, NC
>
>Richard L. Measures, AG6K, 805.386.3734. www.somis.org
>

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