1949 Equipment British Acoustic Page 6
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Meter reading from Left to Right
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To read 3 - 5 MA
for SP4B valve
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To read 8 - 10 MA for TT4 or AC/P
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To read 55 - 60MA
for PEN 428
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To Read 75MA
for PEN 428
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Valves Left to Right
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SPB4
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TT4 or AC/P
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PEN 428
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PEN 428
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FW4/500
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