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Re: [Amps] SB220 Meter blown

To: Adrian <>,
Subject: Re: [Amps] SB220 Meter blown
From: Jim <>
Date: Fri, 15 May 2020 22:49:27 -0500
List-post: <>
Its W7RY whoever you are....

Jim W7RY

On 5/15/2020 10:43 PM, Adrian wrote:
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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