[Amps] SB-220

[R.Measures]

Dan --  I have never measured the fil V in an AL-811.  The only RF-Tx 
amplifiers that do not benefit from a step-start are those that already 
have one.  The Henry 3K-A is one example.

On Dec 27, 2004, at 6:53 AM, Dan wrote:

> 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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Richard L. Measures, AG6K, 805.386.3734.  www.somis.org