And back when the SB220 was built, meters were $3 each.
Today, if you want to protect the appearance and functionality
of your GG Amp's meters, I'd suggest adding an op-amp interface
to prevent high currents from damaging the movement.
Don W4DNR
Quoting Jim <jimw7ry@gmail.com>:
WRONG.
.6 or .7 or slightly more during an "event" volts is still enough to
blow up the meter.
Thanks
73
Jim W7RY
On 5/15/2020 4:08 PM, Adrian wrote:
from ; http://www.somis.org/sb-220ci.html
"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
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|