• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Identify this mullard

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Davestp1

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Joined 2008
#1
Hi, I have an NOS Canadian Marconi Company 5V4G/GZ32 rectifier, states Made in Great Britain and has etched codes, they appear to be SG1 B9I. Can anyone tell where when this tube came from? The first 3 could be 5G1 but under a magnifying glass looks more like an "S". Anyone?

Dave
 
#2
9. Mullard GZ32 1, OEM by ELECTROHOME Campany, Made in GT BRITIAN, gray screen, rectangular addition to gas ring, original Mullard etching Date Code: SG1 B9I, 1959 Nian 9 Yue manufacturing, test status by the AVO very new!!
現售HK$350一支 Are now on sale at HK $ 350 1

looks like it the date code for 1959...............
 
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