I've been told that the plate current meter on the SB-220 can be replaced
with a meter from a Heath HM-102 wattmeter. I've noticed that the meter
movement on the one in the HM-102 is approx. 1/2" in diameter while the one
from the SB-220 is larger at about 1 to 1-1/4" in diameter.
I think the resistance in the SB-220 meter is approx. 1400 ohms and its FSD
is 2ua. I don't know what the specs are on the one in the HM-102.
Can anyone tell me if they are interchangeable or not? I'd hate to blow a
good meter.
Thanks
Walter-VE3EN
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