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19 January 2019 

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3A-172B STC logo

STC logo Vintage UK, NOS. 3A/172B is a HIGH gain (mu=30), AUDIO triode signal tube with a B7 British base. Sockets to fit from stock refer 7PT4 or 7pt4c. Data at Photo and data at Heater 12.6v @ 0.2a, anode 250v, mutual conductance 3, amplification factor 30. This AUDIO triode is equivalent to HL1320 CV1679. Tested. Guaranteed.

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