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Re: [Amps] SB220 Meter blown

To: "'Jim'" <>, <>
Subject: Re: [Amps] SB220 Meter blown
From: "Adrian" <>
Date: Sat, 16 May 2020 13:43:48 +1000
List-post: <>
Well the shunt diode both ways protection method certainly saved my sb-220
meter in the past,
So I just don't believe you W7FRY.  Good diodes should be checked after
install, after any 'event' to check
they have not opened, and therefore replaced before further use.

-----Original Message-----
From: Amps [] On Behalf Of Jim
Sent: Saturday, 16 May 2020 1:20 PM
Subject: Re: [Amps] SB220 Meter blown


.6 or .7 or slightly more during an "event" volts is still enough to blow up
the meter.

Jim W7RY

On 5/15/2020 4:08 PM, Adrian wrote:
> from ;
> "6. Meter damage can be avoided by connecting two, ordinary = or >1A, 
> any PIV, silicon rectifiers across the terminals on each meter. The 
> two diode arrows should point in opposite directions."
> On 16/5/20 1:10 am, Artek Manuals wrote:
>> I am resurrecting a SB220 that had an apparent classic Grid/plate 
>> short event. One of casualties appears to be the right hand meter 
>> movement. This is the one for Grid Current and HV. I am pretty far 
>> into it and the meter movement measures open , the internal shunt 
>> resistor is blackened ( and open?)
>> Anyone got a surplus movement from a parted out unit? Nothing found 
>> on evil-bay at the moment
>> Dave NR1DX
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