![]() Black glass tube NPN transistors are OC139, OC140, OC141 from them. and I’m wondering how Transition Frequency differences work with Fuzz. ![]() simply beccause, OC139 is cheaper than OC140 on ebay. Maximum Collector Current |Ic max|: 0.01 Aįorward Current Transfer Ratio (hFE), MIN: 55įorward Current Transfer Ratio (hFE), MIN: 40 / 75 Maximum Collector-Emitter Voltage |Vce|: 20 V Maximum Collector-Base Voltage |Vcb|: 20 V Maximum Collector Power Dissipation (Pc): 0.125 W OC75 is like this according to this web page on There are 26 of germanium NPN transistors from the data sheetsīlack glass tube NPN transistors are OC139, OC140, OC141 from them. ![]() then found this web page with germanium and silicone transistor lists this pedal has 3 of OC75 glass tube transistors.Īnd, unfortunately, My Sola Sound Bum Fuzz came with 3 of NPN transistors while OC75 is PNP type. My interest in fuzz pedal came from JMI Tone Bender III reissue which belongs to a friend.
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