Npn germanium transistor. New old stock from Texas Instruments.
Npn germanium transistor Nov 15, 2024 · The term complementary describes a relationship between two different transistors. ature in germanium than in silicon, implying consider-ably smaller current cut-o (I CBO) for silicon devices. The NPN transistor features three terminals: emitter, base and collector. Tung-Sol Transistor, TO-22, NPN Germanium RF Converter/Oscillator, FACTORY BOXED. Up for grabs are NOS Black Glass CV7112s germanium transistros which are an NPN transistor and the military version of the OC140. If you reverse the leads, you should not get a reading. 30), and you can find other possibilities on my Stock List, like the 2N2369A or 2N3440. Figure 29 shows an NPN germanium for Q1 and PNP germanium for Q2. $6 a piece Oct 12, 2018 · NPN vs PNP Germanium Transistors for a Fuzz Face October 12, 2018, 06:43:21 AM Hope this too basic a question but let's say we have two Ge transistors measuring the same leakage and hFE, ignoring things like daisy chaining or positive to negative ground wiring, is there a preference for a PNP Ge over an NPN Ge or they as good as each other? The NPN transistor is made of semiconductor materials like silicon or germanium. Motorola HEP Replacement NPN Germanium Transistor, replaces 121-60, 121-70, 121-71, 121-100, 121-165, 121-166, 2N1217, 2N1302, 2N1304, 2N1306 NEWLY ADDED ITEMS Ordering and Shipping Info Q1 can be either germanium or silicon. Use the ones recommened in the multiface. 2x AC130, 2x 2N1304 & 1 bonus to round out the gain ranges. Ignoring the issue of reliablity and gain matching for a moment 1, just figuring out the pin outs are an issue when the datasheet is in Russian! Whilst the layout is reasonably obvious I wasn’t ever 100% sure. NPN wideband silicon germanium RF transistor. 3 Applications AC 127 npn-Transistor legierter npn-Germanium-Transistor Der Transistor AC 127 ist fr die Verwendung als NF-Verstrker geeignet. [31] [32] Although germanium transistors are associated with positive ground PNP Fuzz Faces, you can get NPN germanium transistors too. Observe precautions for handling electrostatic sensitive devices. Google "OC139 datasheet" to find out typical HFE and find an NPN Ge transistor in that range. 6 out of 5 stars 9 ratings BC108 - NPN Transistor - NOS TI. Connect the negative lead to the collector. I have 6 of these, because I am building 2 of the ToneBenders. 7V Apr 1, 2010 · I bought a batch of 100 AC176 off e-bay for $41 USD. In any case, plan on testing and auditioning the Ge transistors because some will sound better than others, again depending on the specific pedal. For higher gain the GT402B are nice for PNP and ranged from 80 to 190 hfe. Feb 26, 2021 · The reason why PNP ones are germanium and NPN ones are silicon lies in the history of the semiconductor technology. If you are willing to buy on ebay, there's a guy in the UK is selling NOS military Ge pnp's, I bought a couple of batches from him and they are all low leakage, type is cv7355, IIRC Nov 15, 2024 · The term complementary describes a relationship between two different transistors. Random selection hFE range: 400-750. 00 More Info. 6V when adjusting the trimpot for Q3? Hello! I have built the (Fuzzdog) Tone Bender Pro MKII and it works and sounds good on first test with guitar, however, when it comes to biasing the transistors, the collector voltage ranges I see when adjusting the trimpots for Q2 and Q3 do not match those in the instructions. N-type means doped with impurities (such as phosphorus or arsenic ) that provide mobile electrons, while p-type means doped with impurities (such as boron ) that Matsushita 2SD352 NPN Germanium Transistor 10 transistors included in this sale. All transistors that I measured were bought in boxes of 50. I haven't come across any higher gain NPN that are worth buying. 8 GHz 110 GHz fT silicon germanium technology 1. 65 dB at 12 GHz Germanium Transistor; Pnp Transistors; Npn Power Transistor; P-n-p Transistor; Npn Smd Transistors; National Semiconductor; Nte Transistor; National Semiconductor Watch; National Transistor Radio; 1n34a Germanium Diode; Germanium Metal; Amplifier Transistors Mar 17, 2023 · Really cool results - especially for the 3AX31C as I don't have any firsthand experience w/ Chinese germanium transistors or see them discussed as much as Soviet transistors. Small Signal NPN Germanium Transistors Reverse the polarity of the leads; the readings should be approximately the same. 0 out of 5 stars 1 rating NPN silicon germanium microwave transistor for high speed, low noise applications in a plastic, 4-pin dual-emitter SOT343F package. Jul 1, 2024 · TL:DR: Tone Bender Pro MKII - Why can I only achieve a range of 0-3. Aug 14, 2008 · Germanium Power Transistors if you are looking for germanium power transistors ( >= 1 Ampere ) it is not many complementary pairs PNP + NPN There are however some powerful devices. General purpose silicon NPN transistor, TO-18 metal can. I am using these for the ColorSound ToneBender MKII Pro and im not sure where to put the transistors in. How can I choose a NPN transistor with the lowest Vbe for my circuit? The Vbe value for a NPN transistor can be found in its datasheet. 6 4. I’m using a pair of AC176 transistors and compared to ‘classic’ PNP germanium fuzz transistors, they’re For Compatibility with other Negative ground circuit stompboxes on the same power supplies, some builders may want to seek out and use a NPN germanium transistor. 5 piece NPN Germanium Transistor Set. TO-5 case. 3 days ago · Well, IMO (if you use the ruffongroove version: Multiface) then use one Q as 2N5088 and the other as 2N3904. For a germanium transistor, this diode drop is lower, typically around 0. the exact opposite of all this would happen with an NPN transistor. Product Image Gallery. Connect the positive lead to the emitter. A good bet is to get some 5088 and a pack of "NPN type switching transistors" from Radio Shack, or go the FET route. It was made to use in old computers and also for switching purposes. I have successfully used a low-gain silicon "dot" for Q1 (Fig. Also germanium are more sensitive to heat than silicon and can end up in thermal runaway and destroy themselves. e. C. Identifying NPN Germanium Transistors Recognizing these electronic components involves understanding their distinctive characteristics and markings. Die Anschlsse sind vom Gehuse elektrisch isoliert Datasheet: AC123 , AC123GN , AC123Y , AC124 , AC124R , AC125 , AC125R , AC126 , 2SC5200 , AC127-01 , AC127Z , AC128 , AC128-01 , AC128K , AC129 , AC129BK , AC129BL . Buy a bunch of the same transistor because you will find a wide range of gain values in a batch. MARKING: FULL PART NUMBER MAXIMUM RATINGS: (TA=25°C) SYMBOL UNITS Collector-Base Voltage VCBO 25 V Emitter-Base Voltage VEBO 25 V Continuous Collector Current IC 300 mA Pricing (USD) Filter the results in the table by unit price based on your quantity. The Germanium Transistor version and The NPN Silicon Transistor version layouts both have a 10k trimmer (R5T) that is not shown in the schematic. 7V. 8 GHz 1. Reasonable silicon replacements for small-signal NPN and PNP germanium transistors are the 2N3904 and 2N3906, respectively. GERMANIUM NPN TRANSISTOR DESCRIPTION: The CENTRAL SEMICONDUCTOR AC127 is a germanium NPN transitor designed for small signal general purpose applications. Anything can go in Q2 position, over 150hfe gain isn't 'necessary'. GE packaging varies, may be bagged or carded as shown. Price/ea. NPN silicon germanium microwave transistor for high speed, low noise applications in a plastic, 4-pin dual-emitter SOT343F package. It is easier (i. This device is sensitive to ElectroStatic Discharge (ESD). Generally you want low leakage and reasonable HFE. All Transistors. Motorola Replacement Semiconductor, TO-18, NPN Germanium, same as In a previous article, I showed how to use inexpensive, low-gain NPN germanium transistors in Darlington pairs to duplicate the performance of expensive, higher-gain bucket devices for the Rangemaster. BC108 transistor. 45 dB at 12 GHz High maximum power gain 14 dB at 12 GHz 110 GHz fT silicon germanium technology 1. For a simple, great sounding project, we recommend the “NPN Silicon Transistor Version”. For a silicon transistor, this diode drop is around 0. 74 dB at 5. Here are the diagrams to build it with an NPN transistor. Aug 8, 2010 · NTE Electronics NTE103A NPN Germanium Complementary Transistor for Medium Power Amplifier, TO1 Case, 1A Collector Current, 32V Collector-Base Voltage Visit the LED Group Buy Store 4. May 20, 2007 · If you're absolutely determined to use a negative ground Fuzz Face, I would suggest that you go through the extra trouble of getting some NPN Germanium transistors which will work properly with a positive power supply and negative ground. In an npn transistor, for example, the n-type emitter has many extra electrons In this video, we will be going over Germanium Fuzz Pedals along with how to set them up for PNP by using a voltage inverter, as well as for NPN Germanium tr 2SD187 NPN germanium transistors. A random sample of 10 transistors tested for hFE and leakage (DCA55, 70 deg. This transistor has three terminals Base, Collector, and Emitter. The leak current lies under 150 µ A mostly regards Uwe Apr 30, 2004 · Amplified by germanium transistors, the music died out instantly as Teal dunked one into a beaker of hot oil. Bell announced the discovery of this new "sandwich" transistor in a press release on July 4, 1951. We believe this is a worthy addition to the circuits, giving you more options for the ultimate sound you want. If you're using silicon emulating germanium, then why use PNP silicon transistors that will need you to have a positive ground when there is no benefit in doing so when the silicon NPN transistors are just as consistent . New Old Stock GT402 (ГТ402) USSR/Soviet Transistor. 2 Features n Low noise high gain microwave transistor n Noise figure (NF) = 0. If you want to build a germanium transistor version, get your transistor set from Small Bear Electronics LLC and use the resistor values that he sends with the transistors. Feb 11, 2007 · My russian data sheet/list states : Ge NPN 50v max hfe 150 to 450 depending if it's A B or C suffix Looking down on the top surface with "case" lug towards you pinout is 2N Series Transistors for sale Germanium General Purpose NPN PNP 2N2828 3A 60V 40W Vintage Power Transistor NPN Gold Plated. Transistor NPN Others with the same file for datasheet: AC121, AC127, AC151, AC152, AC153: Download AC176K datasheet from Siemens: pdf 703 kb : NPN Germanium Transistor for AF power stages up to 3. 2 Features and benefits Low noise high linearity microwave transistor 110 GHz fT silicon germanium technology High maximum output power at 1 dB compression 20 dBm at 1. I've bought from alexer1 on ebay as well - good seller imo. 80Volt 3Ampere 30Watt . They both ranged from 50 to 90 hfe with either zero or extremely low leakage. However, careful sorting and testing are needed, because wide variations in gain and leakage among devices with the same part number are the norm. 8 GHz High maximum stable gain 27 dB at 1. Dec 23, 2024 · Can someone draw me a diagram labeling the pinouts for a PNP Germanium transistor. I have the values of each if thats needed. pt cont germanium point contact gpnp germanium pnp gnpn germanium npn spnp silicon pnp snpn silicon npn sb surface barrier gspnp germanium, silicon pnp gsnpn germanium, silicon npn gspnn germanium, silicon pnn gsnpp germanium, silicon npp key to abbreviations in applications column af audio frequency amp amplifier GE Replacement Transistor for AF amplifier applications, replaces 2N1302, 2N1304, 2N1306, 2N1308 and other NPN Germanium Transistors. The HEPG0011 is a bipolar junction transistor (BJT) with an NPN-type configuration. PNP Germanium. This transistor is in a TO-5 package with long leads commonly found on germanium transistors. The 2SD187 is a popular NPN for fuzz pedals and other effects. This guide only covers silicon transistors you are trying to replace, not Germanium transistors. 2 Features and benefits Low noise high gain microwave transistor Noise figure (NF) = 0. The 2N169A is a higher voltage version of the 2N169, and is NPN silicon germanium microwave transistor for high speed, low noise applications in a plastic, 4-pin dual-emitter SOT343F package. My Clone ET-8 NPN Germanium Transistor. 3 volts whilst those of silicon are about 0. F. Lm 250+ You should test your transistors and make note of the transistor gain (hfe). 1V for small currents. 3 Applications HEPG0011 NPN Transistor. The problem with this circuit is that there are not so many NPN germanium transistors out there. The article below contains information about 2N1304 transistor pinout, features, applications, equivalents and other details. If you want to build a germanium transistor version, you can get your transistor set from Small Bear Electronics LLC and use the resistor values that he sends with the transistors. ALLOY NPN Transistor Others with the same file for datasheet: 2N1307, 2N1309, 2N388, 2N396, 2N396A NPN silicon germanium microwave transistor for high speed, low noise applications in a SOT883C leadless ultra small plastic SMD package. 2N1308 NPN germanium transistors. 25V, 100mW, hfe(typ)=130. PNG Germanium versus Silicon The material the transistor is made of is critical as well. 25. NPN means you can make your pedal negative ground so you do not need to use a special adaptor for you pedal. His resistor TYPE Alpha -numerical transistor index 2. Germanium-based transistors are also characterized by smaller peak inverse voltage (PIV) than silicon devices, averaging 350Vand 1000V, respectively. All pretested and gain sorted. In addition, the typical working temperature for germanium is only about NTE Electronics NTE103A NPN Germanium Complementary Transistor for Medium Power Amplifier, TO1 Case, 1A Collector Current, 32V Collector-Base Voltage 4. 150 I use these transistors for Booster Clones. I'm really curious about the NPN 3BX31B and might snag some up myself. The guy in Germany shipped them fairly quickly, but when tested, they all measure 300 to 400+ on gain. Test 2N388 V BE forward biased voltage drop Probe base (positive lead) to the emitter (negative lead) using the DMM’s diode mode. This setup used NPN germanium for Q1 and PNP germanium for Q2. By examining their physical appearance and markings, you can differentiate these components from others within your electronic devices. . 3 Applications Jun 26, 2005 · Of course the transistors must be PNP for Pos Gnd or NPN for Neg Gnd FF. Item # HEP-641. 6 out of 5 stars 9 5 days ago · It seems that the OC139 is an NPN Germanium transistor. 8 GHz n 110 GHz fT silicon germanium technology 1. 2. Parameters and Characteristics. When a p-type semiconductor material is fused between two n-type semiconductor materials, an NPN transistor is formed. Strange pinout. Jun 2, 2012 · The reason why people opt for PNP germanium fuzz is because the transistors are much more consistent than the NPN equivalents. 3 Applications NPN silicon germanium microwave transistor for high speed, low noise applications in a plastic, 4-pin dual-emitter SOT343F package. MARKING: FULL PART NUMBER MAXIMUM RATINGS: (TA=25°C) SYMBOL UNITS Collector-Base Voltage VCBO 32 V Collector-Emitter Voltage, RBE<70 VCER 32 V Collector-Emitter Voltage VCEO 12 V Low noise high linearity RF transistor 110 GHz f T silicon germanium technology; Optimal linearity for low current and high gain; Low minimum noise figure of 0. M/S Material/Sort C complementary transistor NPN/PNP DG dual germanium transistor DJ dual junction transistor DS dual silicon transistor FET field effect transistor G germanium transistor GD germanium Darlington transistor J junction FET (JFET) M MOSFET ME multiple -emitter transistor MOS metal oxide Feb 15, 2021 · If you have an NPN germanium transistor, you could try that but it would require some adjustments; the viper has a small cap between base and collector to roll off some of the harshness from the silicon transistor to make it sound closer to germanium. Some things I've noticed in testing all my vintage germanium, vintage silicon, and modern silicon transistors:-NPN Ge transistors are more often available at lower gain AC176 Transistor Datasheet pdf, AC176 Equivalent. NPN silicon germanium microwave transistor for high speed, low noise applications in a plastic, 4-pin dual-emitter SOT343F package. However, as it is drawn, it looks like this amplifying stage should not work. I'm interested in the Fuzz Aldrin (which fits, given the source of my transistors!) but wondered about other NPN circuits that use Germanium transistors that you would recommend. cheaper) to make NPN silicon transistors (starting from low-doped N bulk silicon) and it is easier to make PNP germanium transistors. It is equivalent to AC127 and NTE 103A. 2 Features and benefits Low noise high gain microwave transistor Minimum noise figure (NFmin) = 0. For a simple and great sounding ToneBender, build the silicon transistor version. Or mix in some NPN Ge's if you can find some. Like the symmetry of human hands, the complementary semiconductors share similar structures and performance. One transistor is an NPN type, and the other is a PNP type. $5. Almost any NPN Ge transistor could be used. Like the AC127, the NPN polarity of the 2SD187 allows for use with standard pedal power supplies. Having succeeded with the RM, I have applied the same idea to the Fuzz Face. 0 4. Thats my opinion. Germanium devices were also characterized as having smaller output resistance and smaller magnitudes of Early voltage. Rangemaster NPN Schematic; Rangemaster NPN Parts Layout and Wiring Diagram Sep 11, 2014 · For a germanium transistor you'll read between 2 and (at most) 4 volts, for silicon it would be between 5 and 7 volts. Item # ET-8. Small Bear resistor designations (R2, etc) are the same as the designations on NPN Transistor: Download 2N1304 datasheet from Central Semiconductor: pdf 95 kb : Germanium NPN fast switching Transistor Others with the same file for datasheet: 2N1302, 2N1306, 2N1308: Download 2N1304 datasheet from COMPELEC: pdf 1308 kb : H. ” Interesting text in the brochure states: “ Since 1954, Sylvania NPN Germanium Alloy Transistors have recorded trouble-free performance throughout a broad spectrum of Very Low stock (one pedal) REUSS GERMANIUM BENDER Premium 1960s germanium fuzz tones from this amazing little tonebender mark II based pedal Made with NPN germanium transistors for modern power polarity and trouble-free pedalboard integration Uncompromising, true boutique construction, completely handmade in the European Union with a matched trio of vintage new old stock USSR-era MP11 NPN Nov 24, 2021 · I've got some AC127 transistors (bought from Marc Ahlfs back in the day) and a single NTE101. Selected NPN Ge transistors have excellent gain (Hfe) ratings for Fuzzface, Tonebender, etc fuzz builds, as well as low leakage (Icb) for a stable, more reliable pedal with less temperature sensitivity. The Tonebender Mk2 used a germanium transistor here, so the base voltage does not need to be very high. 8 GHz On April 12, 1950, Bell Labs chemists Gordon Teal and Morgan Sparks successfully produced a working bipolar NPN junction amplifying germanium transistor. Big bullet casing, and cool vintage vibe. Feb 23, 2022 · Test working 2N388 TO-5 NPN germanium transistor with known pinouts. Aug 8, 2012 · NTE Electronics NTE155 NPN Germanium Complementary Transistor for Audio Power Amplifier, TO-66 Case, 3A Collector Current, 32V Collector-Emitter Voltage Visit the LED Group Buy Store 4. 7 dB at 5. ): Note: Th HEP-641 NPN Germanium Transistor. Among germanium transistors, many type numbers (see the list below) are possible candidates for FF circuits and clones. 1. The reading Jan 1, 2022 · The MP38As tend to be leaky, which can be a good thing or a bad thing depending on the pedal. New old stock from Texas Instruments. The reading should be 30-50 ohms. looks almost like TO-3 Nov 27, 2023 · 2N1304 is a TO-39 package NPN germanium alloy junction transistor from 2N130x series. Our Price: $30. Mar 6, 2019 · The part in question today is the Russian MP38A NPN Germanium Transistor. Germanium transistors are a classic choice for guitar fuzz pedals, vintage radio restoration, and many other applications. AC176 Datasheet Material of Transistor: Ge Polarity: NPN Jul 24, 2007 · Good transistors for Fuzz and Booster are Russian MP20 and MP21 (Germanium PNP) the GT311 is Germanium NPN. Connect the negative lead to the base. 2 Features and benefits Low noise high gain microwave transistor Noise figure (NF) = 1. These in-family relationships extend to MOSFETs and NMOS technology, where one device is an N-channel, and the other is a P-channel. If you buy a few and put a socket on the board for the transistor you can try a few to see/hear which B. Low leakage NPN Ge, Icb < 200mA! *In stock, ships from Berlin, Germany* NPN Germanium Transistors for your DIY Fuzz pedal build. $9. 5 Watt: Download AC176 datasheet from Siemens: pdf 992 kb : NPN germanium alloy transistor: Download AC176 datasheet from TUNGSRAM: pdf 225 kb Mar 7, 2024 · In most cases, germanium transistors can be replaced with modern general-purpose silicon bipolar transistors with no modification to the circuit. 40. Measured on TC1 transistor tester. The kit includes everything you need if you use silicon transistors. Power PNP Germanium Transistors 1. That means the HEPG0011 transistor has a positively charged layer between two negatively charged layers. 8 GHz n High maximum stable gain 27 dB at 1. Materialet ger dåliga högfrekvensegenskaper, hög Bipolar junction transistors (BJT’s) are components made of three layers and can either be a thin layer of P-type semiconductor sandwiched between two layers of N-type (NPN transistors) or a thin N-layer sandwiched between two P-Layers (PNP Transistors). Nov 26, 2021 · · PNP and NPN transistor diagram. An NPN transistor comprises two semiconductor junctions that share a thin p-doped region, and a PNP transistor comprises two semiconductor junctions that share a thin n-doped region. The 2N1308 is a popular NPN for fuzz pedals and other effects. So many circuits are PNP and it's rare to find a good one it would seem. To get Ge transistors to bias correctly, it is common to cherry-pick them or fiddle the bias resistors. Great for vintage style fuzz circuits. The BFU910F is suitable for small signal applications up to 20 GHz. 3 Applications Any low gain NPN transistor would work here: 2N5088, 2N3904, 2N4401, BC108, BC109, BC109C, BC183, BC183L, BC209C (all of them are Silicon). Aug 11, 2017 · The main difference between germanium and silicon transistors in switching circuits, be they either PNP or NPN transistors is that VBE for small germanium is about 0. NTE Equivalent $6. 5 Watt: Download AC176K datasheet from Siemens: pdf 992 kb : NPN germanium alloy transistor: Download AC176K datasheet from TUNGSRAM: pdf 225 kb NPN Symbol för bipolär NPN transistor: Germanium var grundmaterialet för de första halvledarkomponenterna. May 6, 2012 · The reason for swapping out npn for pnp is that Ge transistors are commonly available in pnp but npn's are rare (and not as good). Most are dated late 1971. PNP Real Negative Ground: We can use a MAX1044 (or the equivalents: ICL7660, TC1044) to create a "real" -9V The 1957 2 nd edition of the GE Transistor Manual documents the 2N169 for use in a hobbyist circuit, and later additions of the GE Transistor Manual identify the 2N169 as a general purpose NPN germanium “workhorse” equivalent to such other well known types as the 2N35 and 2N229. The BFP640ESD is a Silicon Germanium Carbon (SiGe:C) NPN Heterojunction wideband Bipolar RF Transistor (HBT) in a plastic dual emitter standard package with visible leads. Germanium was the material of choice for early transistors and you are likely to find those used in vintage gear made in the Apr 4, 2013 · GT308V for PNP and MP38A for NPN are both great. The true Transistor NPN Others with the same file for datasheet: AC121, AC151, AC152, AC153, AC153K: Download AC176 datasheet from Siemens: pdf 703 kb : NPN Germanium Transistor for AF power stages up to 3. 4 GHz and 0. Great option for Q2 position of a Fuzz Face, or anywhere a higher gain, low leakage Ge transistor is required. The groups: MP20A and G: 50150 MP20B 80200 MP20 W, MP21G: 2080 MP20D: 130200 MP21W: 20100 MP21D: 60200 MP21E: 30. Sylvania brochure titled: “8 Typical Circuits for Time Tested Sylvania NPN Germanium Alloy Transistors – Oval Shaped for High Stacking Density. 7 volts. GE-8 Replacement Transistor for AF amplifier applications, replaces 2N1302, 2N1304, 2N1306, 2N1308 and other NPN Germanium Transistors. High gainer in Q1 may not improve the guitar volume/gain rolloff. The device is fitted with internal protection circuits, which enhance robustness against ESD and high RF input power strongly. The true NPN silicon germanium microwave transistor for high speed, low noise applications in a plastic, 4-pin dual-emitter SOT343F package. 50. GERMANIUM NPN TRANSISTORS DESCRIPTION: The CENTRAL SEMICONDUCTOR 2N1302, 2N1304, 2N1306, and 2N1308 are germanium NPN transistors designed for computer and switching applications. Jan 28, 2018 · In addition, it was verified that the center of mass of each of the NPN-PNP pairs of germanium and silicon devices are crossed by respective $\beta$-isolines for gains of 130 and 250, respectively. Small Bear Electronics has NPN Germanium transistors. I have found one guy selling NEW EXEMPLARS in Original Package of these: > 2N268 . 4 IN STOCK . PNP . They’ll slot right into this circuit with no need to alter the power supply or battery connections. Feb 13, 2009 · Higher temperatures and currents can increase the Vbe, while different doping levels can alter the Vbe and other properties of the transistor. Look for transistors with a low Vbe value, typically around 0. These may be GT402 A, B, G, N, or V. 50 dB at 2. 1 day ago · NPN: 2N388, 2N1306, 2N1308, 2N1309, 2N1373 But of course bias is a moving target with germanium transistors and the attack pot's tolerance alone can cause a wide 6pcs Germanium Transistor NPN MP38A ~ 2SD195, 2SD33, OC75 Tone Bender USSR This is a New Old Stock RCA SK3011 NPN germanium transistor in the original package. NPN silicon germanium RF transistor for high speed, low noise applications in a plastic, 4-pin dual-emitter SOT343F package. fhcqcvjdpshdslxrvmwqxplrrjewjauezkrvjpypddxbusldxfnrokr