Transistors

The AS394CH is a junction isolated ultra well-matched monolithic NPN transistor pair with an order of magnitude improvement in matching over conventional transistor pairs. Electrical characteristics of these devices such as drift versus initial offset voltage, noise, and the exponential relationship of base-emitter voltage to collector current closely approach those of a theoretical transistor. Extrinsic base and emitter resistances are very low, giving very low noise and operating over a wide current range. To guarantee long term stability of matching parameters, internal clamp diodes have been added across the emitter-base junction of each transistor. These prevent degradation due to reverse biased emitter current, the most common cause of field failures in matched devices.

2N321 PNP germanium transistors. The 2N321 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.

The AS395 dual monolithic PNP transistor offers excellent parametric matching and high frequency performance. Low noise characteristics (1 nV/√Hz typ @ 1 kHz), high bandwidth (190 MHz typical), and low offset voltage (100 µV max), makes the AS395 an excellent choice for demanding preamplifier applications.Tight current gain matching (3% max mismatch) and high current gain (100 min), over a wide range of collector current, makes the AS395 an excellent choice for current mirrors. A low value of bulk resistance makes the AS395 an ideal component for applications requiring accurate logarithmic conformance. To ensure the long-term stability of the matching parameters, internal protection diodes across the base-emitter junction clamp any reverse base-emitter junction potential.

A1837 Transistor - Fender. Power amplifier applications and Driver Stage Amplifier Applications.

The AS194DE is a junction isolated ultra well-matched monolithic NPN transistor pair with an order of magnitude improvement in matching over conventional transistor pairs. Electrical characteristics of these devices such as drift versus initial offset voltage, noise, and the exponential relationship of base-emitter voltage to collector current closely approach those of a theoretical transistor. Extrinsic base and emitter resistances are very low, giving very low noise and operating over a wide current range. To guarantee long term stability of matching parameters, internal clamp diodes have been added across the emitter-base junction of each transistor. These prevent degradation due to reverse biased emitter current, the most common cause of field failures in matched devices.

ASY76 PNP germanium transistors. The ASY76 is a PNP transistor recommended for audio frequency amplifiers and drivers and works well in effects that use germanium transistors such as fuzz and boost pedals. This transistor is in a TO-5 package with long leads commonly found on germanium transistors.

The BC183 is a general purpose NPN transistor in a TO-92 case. The BC183 is commonly used in fuzz pedals and has a reputation as a warm sounding silicon transistor for fuzz.

The BC546 is a silicon general purpose NPN transistor in a TO-92 package. The BC546’s typical applications include signal processing, amplification, and switching. The BC546 is available in two different gain ranges: BC546B and BC546C. Type hFE (IC=2mA, VCE=5V) BC546B 200-450 BC546C 420-800

MPSA63 PNP Darlington transistor (TO-92 package) - designed for high gain, low noise general purpose amplifier applications.

• Max collector to emitter voltage = -30V
• Max collector to base voltage = -30 V
• Max emitter to base voltage = -10 V
• Max collector current = -0.5 A (continuous)

Designed for full-wave triggering in Triac phase control circuits, half-wave SCR triggering application and as voltage level detectors. Used in most Peavey linear power amplifier designs through 2000 including CS/M/DECA series power amps, IPA300, and all models using 402/602/304S/204S power modules.

• Low Switching Voltage — 8 Volts Typical
• Uniform Characteristics in Each Direction
• Low On-State Voltage — 1.7 Volts Maximum
• Low Off-State Current — 0.1 mA Maximum

New old stock 2N404A PNP germanium transistors manufactured by Texas Instruments. These TI 2N404A feature gold plated leads. The 2N404A is used in many fuzz pedals along with other effects. The 2N404A is the same as the 2N404 but with a higher voltage rating. This transistor is in a TO-5 package with long leads commonly found on germanium transistors.

SDS 7204 transistor, 300 V, 10 mA, Case-30.