Synth & Eurorack Parts / DIY

NTE123 NPN silicon transistors. The NTE123 is a popular NPN for fuzz pedals and other effects. This transistor is in a TO-5 package. The NTE123 was used in the Texas Square Face made by Cesar Diaz, the famous amp tech who worked with Stevie Ray Vaughan and others. Early in his career, SRV had a broken Fuzz Face pedal and took it to Cesar Diaz to have him fix it. Diaz fixed and modified the pedal and this became the foundation of his famous version which he named the Texas Square Face. The Diaz pedals often came socketed and included a set of NTE123 along with the standard pair of P-QNTE103 to experiment with the different sounds of the transistors.

NTE103 NPN germanium transistors. The NTE103 is a popular NPN for fuzz pedals and other effects. This transistor is in a TO-5 package with long leads commonly found on germanium transistors. The NTE103 was used in the Texas Square Face made by Cesar Diaz, the famous amp tech who worked with Stevie Ray Vaughan and others. Early in his career, SRV had a broken Fuzz Face pedal and took it to Cesar Diaz to have him fix it. Diaz fixed and modified the pedal and this became the foundation of his famous version which he named the Texas Square Face. The Diaz pedals often came with socketed NTE103 and included a set of P-QNTE123 to experiment with the different sounds of the transistors.

TI377 PNP germanium transistors from Texas Instruments. The TI377 is a great PNP for fuzz pedals and other effects. This transistor is in a metal SO-2 package with long leads commonly found on germanium transistors. This package with the gold leads visually matches the 2G308, 2G309, and 2G381 transistors found in Zonk and Tonebender MKI fuzz pedals.

AC132K PNP germanium transistors. The AC132K is a popular PNP for fuzz pedals and other effects. This transistor is in a thick rectangular heat-sink package with long leads commonly found on germanium transistors.

BC238B NPN transistor in a TO-92 package. The BC238 is used in a variety of vintage pedals such as the Schaller Fuzz, a version of the Brian May treble boost,and later Jen / Tonebender fuzz pedals. The BC238B is a variant of the BC108B and works well in other classic fuzz pedals such as Fuzz Face and Big Muff builds.

OC42 PNP germanium transistors. The OC42 is a popular PNP for fuzz pedals and boost effects. It can be found in vintage electronics and modern fuzz pedals. This transistor is in a black glass SO-2 package with long leads commonly found on germanium transistors.

OC83N PNP germanium transistors. The OC83N is a great PNP for fuzz pedals and boost effects. It is the TO-1 version of the OC83 which can be found in many fuzz pedals such as MK1.5 and MKII Tonebender clones. This transistor features long leads commonly found on germanium transistors.

2N2646 programmable unijunction transistor often referred to as a PUT. The 2N2646 can be found in many tremolo effects pedal projects and vintage classics such as the Vox Repeat Percussion.

BC148C NPN transistor in a rare Mullard Lockfit package. The BC148C is the equivalent of a BC108C but in the Lockfit package rather than a TO-18. The BC148C was used in a variety of audio and radio equipment and works well for fuzz and other effects.

OC41 PNP germanium transistors. The OC41 is a popular PNP for fuzz pedals and boost effects. It can be found in vintage electronics and modern fuzz pedals. This transistor is in a black glass SO-2 package with long leads commonly found on germanium transistors.

OC46 PNP germanium transistors. The OC46 is a popular PNP for fuzz pedals and boost effects. It can be found in vintage electronics and modern fuzz pedals. This transistor is in a black glass SO-2 package with long leads commonly found on germanium transistors.

SFT319 PNP germanium transistors. The SFT319 is a popular PNP for fuzz pedals and other effects. This transistor is in a 18B4 package with long leads commonly found on germanium transistors. This style of package can be found in Italian built Vox Tonebenders.

The BC182 is a general purpose NPN transistor in a TO-92 case. The BC182 is commonly used in fuzz pedals and has a reputation as a warm sounding silicon transistor for fuzz. The BC182 has a more narrow hFE range than the BC183 which can be helpful for certain builds.

The BC209C is a silicon NPN transistor in a TO-106 case. The BC209C is primarily intended for general purpose audio applications. BC209C transistors were used in original silicon Fuzz Face® pedals as well as a variety of D*A*M pedals.

OC141 NPN germanium transistors. The OC141 is a popular NPN for fuzz pedals and boost effects. This transistor is in a glass SO-2 package with long leads commonly found on germanium transistors. The NPN polarity allows for use with standard pedal power supplies. The dot indicates the collector lead.

2N797 NPN germanium transistors. The 2N797 is a popular NPN for fuzz pedals and other effects. The NPN polarity allows for use with standard pedal power supplies. The 2N797 is a fairly unique germanium transistor since it is in a TO-18 package.

J201 N-Channel JFET in a TO-92 package. The J201 is designed primarily for low level audio and general purpose applications with high impedance signal sources.

• Max drain to gate voltage = 40 V
• Max gate to source voltage = -40 V
• Max forward gate current = 50 mA

2SD77 NPN germanium transistors. The 2SD77 is a popular NPN for fuzz pedals and other effects. The NPN polarity allows for use with standard pedal power supplies.

2N2613 PNP germanium transistors. The 2N2613 is a popular PNP for fuzz pedals and other effects. It was used in the Gibson Maestro FZ-1A and the Selmer Buzz Tone. This transistor is in a TO-1 package with long leads commonly found on germanium transistors.

2N2430 NPN germanium transistors. The 2N2430 is a popular NPN for fuzz pedals and other effects. The NPN polarity allows for use with standard pedal power supplies.

NPN Darlington transistor (TO-92 package) - designed for high gain, low noise general purpose amplifier applications.

• Max collector to emitter voltage = 45 V
• Max collector to base voltage = 45 V
• Max emitter to base voltage = 6.5 V
• Max collector current = 0.2 A (continuous)

The 2N3392 is a general purpose NPN transistor in a TO-92 case. The 2N3392 is used in some original silicon Fuzz Face pedals as well as the Brassmaster fuzz.

2N1303 PNP germanium transistors. The 2N1303 is a popular PNP for fuzz pedals and other effects. This transistor is in a TO-5 package with long leads commonly found on germanium transistors.

General purpose low-power PNP bipolar junction transistor, used frequently in hobbyist electronic projects. For the NPN 2N3904 see P-Q2N3904