McVitie Weston valve collection
- Made:
- c.1937
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LicenseMazda double diode output pentode valve, type PEN.DD
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Mazda double diode output pentode valve, type PEN.DD.4021, B7+tc base, marked 'DUMMY', only two of 7-base pins unmutilated, (RMW/Y95 - McVitie Weston number), made by British Thomson-Houston Company Limited, c. 1937.
