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R.A.F. Henlow Signals Museum Exhibits

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Loud+Speaker_Hadley_Box=0030.jpg Measuring+Set_Telegraph_Distortion_RX=0423.jpg

Meter_Field_Strength_I-95_BM=0365.jpg Meter_Frequency^Type_BC-221-N=0313.jpg
Loud Speaker
Hadley Box
Measuring Set
Telegraph Distortion RX
Electronic Test
Field Strength I-95 BM
Type BC-221-N

Electronic Test Meter

AVO Electronic Test-meter MkII Serial 2172. Type ETM4

A sensitive valve voltmeter and component bridge that uses a double triode 6SN7GT valve in a conventional bridge circuit. For RF measurements there is a probe that contains a double diode 6AL5 valve.

Meter<br>Electronic Test

Meter Electronic Test (Photograph Number 0322)

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