[ARC5] BC-221-J vs BC-221-T or what?

[Richard Knoppow]

     Mine is in a wooden case with a compartment at the bottom for 
either the battery or an AC power supply.  The trimmer for the 
calibrator is mid chassis and faces the rear.  The case has no access 
holes in it.  Its possible versions in a metal cabinet have an access 
hole for the trimmer.  Mine also came with a pair of headphones in a 
small compartment in the front below the meter.  There seem to be a 
great many variations of the BC 221 and its sister the LM.

On 2/13/2016 9:55 AM, John Hutchins wrote:
> I believe that in some models, the ID plate center bottom, can be 
> removed to adjust the freq of the calibration circuit ?
> Hutch
>
>
>
> On 2/12/2016 9:13 PM, Richard Knoppow wrote:
>>    Somewhere I found a military TM that covers all of the BC-221 
>> meters. Noton BAMA and I can't find it. It may help because at least 
>> it would tell you what differences are between them.  I have a 
>> BC-221, a late one with factory power supply. I have to look to see 
>> which version it is.  Its in a wooden case which makes setting the 
>> crystal calibrator difficult since it drifts a little with 
>> temperature and I don't want to drill a hole in the case. It is quite 
>> accurate once warmed up.
>>
>> On 2/12/2016 4:38 PM, Don Merz via ARC5 wrote:
>>> I guess the time has come for me to keep one of these in the shack. 
>>> I have had literally dozens of them go through my hands over the 
>>> years. Now I have two here and one of them is going to stay. But 
>>> which one? The J model is in lesser condition. The T model is almost 
>>> like new. Both have AC supplies in them--the one in the T model 
>>> might be a factory supply. The one in the J model is almost 
>>> certainly homebrew. Both have the spare tubes and hex wrench where 
>>> they ought to be. Both have the correct calibration books. Both were 
>>> made by Zenith.
>>>
>>> Is there any reason to prefer one over the other except overall 
>>> condition? I have not tested them yet. But it does not seem like 
>>> they would be hard to get running. Is there an achilles heel in them 
>>> that I should check?
>>>
>>> Any suggestions welcome.
>>> 73 de N3RHT
>>>
>>>
>>>
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>>
>> -- 
>> Richard Knoppow
>> 1oldlens1 at ix.netcom.com
>> WB6KBL
>>
>>
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>
>
>
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-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL

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