[Amps] SB-220 metering

[Gary Schafer]

Static on the plastic meter face?

73
Gary  K4FMX

Gudguyham at aol.com wrote:
> In a message dated 1/30/04 11:42:35 PM Eastern Standard Time, 
> n4zr at contesting.com writes:
> 
> 
> 
>>It occurs to me that a couple of years ago the multimeter stopped working 
>>in the relative power and HV positions -- it still works for grid 
>>current.  Could the switch be progressively failing, since that's about the 
>>only component in common between the two metering functions, it 
>>appears?  If so, does anyone know of a replacement switch with the proper 
>>indexing to match the panel?
>>
>>
> 
> 
> Its not unlikely that the series meter multiplying resistors have gone bad 
> (one opened) for the HV problem, and perhaps the sensing diode has gone in the 
> rel output mode.  It could be the switch, unlikely though.  In any case, I have 
> the complete HV metering resistors for sale for replacement and also have 
> replacement meter switches if that's your problem.  As far as the plate meter 
> reading, it seems that you have a "rough spot" in the meter.  This usually can be 
> remedied but backing off slightly on the nut at the center of the meter. Hold 
> screw in palce with jewlers screwdriver and loosen nut a tad.  Blow on meter 
> movement to see if it returns smoothly adjust nut and screw accordingly until 
> meter runs freely.  If you would like to purchase the replacement metering 
> resistors or switch, please contact me off list.  73 Louie W1QJ   W1QJ.COM
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