[Heathkit] SB-200

[Garey Barrell]

Actually, I think it's both.   It's a voltage divider of three 4.7M 
resistors in series, (probably overloaded voltage wise and which have no 
doubt increased in value,) with a 15K resistor at the "bottom" of the 
divider to ground.  Without tracing through the switching, it looks like 
the 15K is a shunt across the 200 uA meter.

73, Garey - K4OAH
Atlanta

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<http://www.k4oah.com>



Peter Markavage wrote:
> Yep! Good point. In the HV position, not shunt resistors. Of course,
> easier to say then "check the resistors in the meter circuit that make
> the HV scale read acccurately".
> I probably should check mine. I haven't looked at them in 36 years. Maybe
> I should change the tubes too. They're still original.
>
> Pete, wa2cwa
>
> On Wed, 26 Jul 2006 08:40:41 -0500 Robert & Linda McGraw K4TAX
> <RMcGraw at Blomand.Net> writes:
>   
>> Let me correct a point.  The meter resistors are not shunts, they are 
>>
>> multipliers and thus connected in series with the meter.
>>
>> Typical of carbon resistors is to increase in value with age.  
>> Measure them 
>> and if out of tolerance by more than 5%, replace them.
>>
>> 73
>> Bob, K4TAX
>>