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Ac128 transistor hfe. So it does not really look good to me.


Ac128 transistor hfe 256310 01. AC176 Transistor Datasheet pdf, AC176 Equivalent. Started by wakeuptone, March 18, 2011, 09:44:40 AM. Transistor Pinouts and General Data. Also with differing hfe's. 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 DSI germanium Transistor AC128. Status: NOS (New Old Stock) Tested Components: YES all Hfe over the minimum 55RoHS compliant: no . 9v and a plastic breadboard. Below, we have included all possible graphs measured using a Peak DCA75, including plots of both NKT275s' hFE measured with varying V ce and I c, which should allow for much closer matching of the commonly-used specifications if desired. AC187 Transistor Datasheet pdf, AC187 Equivalent. second, if all you have are 2N3904 for the lpb1 (q1 in flare schematic) that's fine, just measure them and use the Jun 26, 2005 · i blew up the 90 hfe so put in a nte w/ hfe of 80. Package: TO-1 can . Sep 5, 2024 · Germanium PNP transistor AC128 VI manufactured by Tungsram. Material of Transistor: Ge Polarity: PNP Maximum Collector Power Dissipation (Pc): 0. Interesting. 3mA is suspicious and more than 0. 8j-amb in free air 10 700 0·29 . Sadly, Ge transistors aren't really made anymore, and the remaining ones often lack the electrical specs that a fuzz circuit requires. 2K resistors) to set the voltage on the transistors' collector. Most often these are currently (or recently) manufactured AC128. Keen's web article "The Technology of the Fuzz Face" (to be read, indeed !). mo. ZXRD060 Precision Shunt Regulator is a 10-terminal adjustable dual shunt regulator offering excellent temperature stability and output handling capability. AC128 PNP GERMANIUM TRANSISTOR ORIGINAL RS USED AND TESTED AT HFE=57 LAKAGE= 0. 4 37 AC128/01 PNP 2 52 164 6. 31 32 AC128/03 PNP 4 208 133 2. synthrotek. 246 in stock RCA 3804 Germanium Mar 11, 2020 · One pair NOS 2N1307 Germanium PNP Transistors for vintage circuits. ra, mu. 25mA. It May 7, 2024 · AC128 PNP GERMANIUM TRANSISTOR ORIGINAL NEW AND TESTED AT HFE=223 LAKAGE= 1. 55 21 AC128/04 PNP 5 227 132 3. After this early germanium years , the production switched to the modern, temperature independent, and more stable silicon transistors like the BC108C, BC109C, and BC209C. PNP Germaniumtransistor AC128 Handselektiert bei 20°C mit einem Leckstrom < 300µA. My question here is, is the actual transistor selection important for each position, or is it more important just to get the hfe and leakage right? Aug 26, 2007 · However, its hfe of 200 sounds like a little much. 6V FB pin that allows it to control the regulation of rails. TRANSISTORS. Print. AC128 PNP Transistor. The TRANSISTORS. hFE range from 60-120&quot; These are sort of a RF May 7, 2024 · The ICE0 figure is leakage. 50 and 70 or 110 and 140. In terms of technical specifications, the AC128 has a maximum collector current of 100mA and a maximum power dissipation of 300mW. Jan 31, 2019 · This is why today, I would like to introduce you to my old buddy, the AC128 germanium transistor , exclusively used in my handmade Mercer Box and KATAPULT pedals . Also you say drop three of these into the circuit, DO NOT DO THAT. Which would make a DMM unreliable for testing Ge's. Thanks for all your help! Hey guys So this is really dumb, but I simply cannot get my ff clone to work! Feb 2, 2021 · Interestingly later reissue editions of the Fuzz Face did feature AC128’s, while there seems to be no empirical evidence for them having appeared earlier on. Silicon material alternative for AC128 are 2N2905, 2N4032, 2N3109, 2N3107, BC337. Brand New. You can buy our transistors in I have started testing the various components on my pedal build, and I had acquired a Ge AC128 pairing that was supposed to have hfe 70-85 for Q1 and 120-140 for Q2. So GT402J ~ AC128 Germanium P-N-P transistor, 40V , hfe 30-80 P=600 mW PNP. C $12. AC 127 npn-Transistor legierter npn-Germanium-Transistor Der Transistor AC 127 ist fr die Verwendung als NF-Verstrker geeignet. That's the only part I don't understand on this thing. These are un-used and FULLY ! According to this great page on the MKII, you want 70 hfe for Q1 & Q2, and 100 hfe for Q3. Only 1 left! Apr 2, 2023 · I have a small collection of about 30 AC128’s and some rare NKT275’s too! I built my very own ‘Fuzz Face’ and ‘Tone Bender’ (nearly same circuit with an extra input pnp germxistor). Forward Current Transfer Ratio (hFE), MIN: 100 Noise Figure, dB: - Feb 13, 2018 · Every time |I used different transistors in them, ac125, ac128, mp16b, mp20b, basically whatever I had on hand. hFE: 50 - 110. Polarity: PNP. Sep 7, 2009 · - the transistor model is a 2N5771 which is nothing like a AC128 transistor. Do it just like the schematic? A wire to one side terminal and the middle terminal, then solder them to the spots shown Jul 5, 2023 · Q: What are some alternative transistors to the OC75? A: Since the OC75 transistor is obsolete, there are several alternative transistors available that can be used as replacements. About 50/60 hfe. As Somnif said, changing up hfe's might just result in the pot levels being slightly Oct 28, 2020 · So my assumption is that the signal from the guitar just isn't strong enough to get the circuit going (ie not enough voltage on the base of the first transistor), which makes me wonder if this is a transistor issue? I tested the hFe of the supposed AC128 transistors on my multimeter and it said 678 for one of the transistors, and 680 for the other. 13 15 AC128/02 PNP 3 67 93 1 0. 1 hFE (IE = 300 mA, Vea = 0) 60 to 175 lcao (Ven = -IOV, IE= 0) Ptot max. ¡Compra con confianza en eBay! Transistors are mainly measured using gain (hFE). Tested with RG Keens method. Abstract: bc649 AC129 Datasheet, Equivalent, Cross Reference Search Type Designator: AC129 Material of Transistor: Ge Polarity: PNP Maximum Collector Power Dissipation (Pc): 0. Tested for HFE, unable to test for noise . Germanium transistors: Q2 AC128 (Hfe 60-80) - Q3 AC128 (Hfe 100-120) Silicon transistors: 2N3906 Equivalência de transistores, circuitos integrados, diodos AC128. To choosing an specific hFE transistor, please enter here AC128 Germanium PNP transistor. May 7, 2024 · I bought what are supposed to be PNP Germanium AC128 transistors for a Fuzz Face build, yet when I measure them with my meter, I get 915 hfe for both. May 7, 2024 · Going forward, I'd highly recommend sticking to ex-Soviet germanium if you need low-leakage transistors. Oct 8, 2021 · NPN Complementary of AC128 is AC127 . $9. AC128 is a TO-1 package transistor. It Jan 9, 2007 · My npn version has a (2n388; 2n1114) with (hfe=73, leak=29ua; hfe=123, leak=120uA) Well, in fact any Ge with a transition freq ft far above 20khz, leaking less than 200uA and with gain around 50 - 150 will sound good. Leakage is below 300uA unless otherwise specified. . 36mA, which is a bit high to be used for a germanium transistor (0. So I assume I can just switch out the resistors manually, correct? That's correct. A key difference to the Fuzz Face was in the choice of transistors - which really was just an opportunistic cost-saving choice. 00 shipping. AC128 Transistor Germanium - Case: TO1 Make: Motorola Semiconductor May 7, 2024 · AC128 PNP GERMANIUM TRANSISTOR ORIGINAL NEW AND TESTED AT HFE=125 LAKAGE= 0. AC128 Transistor Datasheet pdf, AC128 Equivalent. You can build this pedal with either germanium or silicon transistors. all Hfe over the minimum 45 Since this first picture, I improved a bit the circuit with transistors sockets that are very nice in order not to overheat germanium transistors, and to test different combinations of hfe. Aug 8, 2011 · There are many examples of these transistors on ebay, npn/pnp matched pairs, untested and tested with hfe values given. sg aci 17 ac117r 214467 251373. Aug 31, 2007 · On the topic of transistors, can anyone recommend a good DMM with a transistor tester? I suspect that the average DMM assumes that there is no significant leakage - fair enough for a silicon transistor - but doesn't correct for the (sometimes enormous) leakage on a Ge transistor. I read that some used trimpots (50K and 10K instead of the 33K and 8. We test all of our AC128’s for optimum gain and leakage current so that they are guaranteed to bias properly and sound great! We choose lower gain En eBay encuentras fabulosas ofertas en Transistor de Germanio Ac128. bjt. Envío gratis en artículos seleccionados. 8 0. They all sounded like fuzz factories to me. NPN Epitaxial Silicon Transistor. The MPSA18 has an hfe of 500! But then again, the BC108C trans. Equiv. There is a lot of fake and imitation transistors out here because i have been on the search for a decent pair for 3 months. Replacement and Equivalent. I assume that's not what AC128s usually measure? I'm also assuming my meter is working correctly. For example if you want a matched pair, buy 2 transistor plus 2 hFE selection product. I haven't noticed any AC128 Germanium PNP transistor. Get the best deals on Germanium Transistor Ac128 when you shop the largest online selection at eBay. The transistors are the most sensitive part of the design with a whole mythology that has grown up around them. I watched a JHS video about stacking pedals and a That Pedal Show video about hitting a overdrive May 7, 2024 · What are you using to test them? If it's a multimeter, it's not going to give you an accurate hFE reading for germanium transistors. hFE: 50 - 90. Socket and try whatever you can find that's a pnp. BJT; MOSFET; IGBT; SCR; Hfe 45: Caps TO1: AC128 Ge PNP 1 32 16 10 1 100 1 200 45 MP38A MATCHED PAIR hFE SOVIET GERMANIUM NPN TRANSISTOR 0. May 7, 2024 · The tester came on today. Q1 in a fuzz factory is a silicon 2N3904, if you use an AC128 it will not work and will probably break the transistor. These transistors were made in Bulgaria (ZPP - Botevgrad) in 1970s and 1980s under French license (licensed copy of the SFT322 transistor). GREAT in vintage fuzz and boost pedals. 3 0. ucb uce ueb PAR Box Caixa Pinos Pinout; AC128 PNP Germânio: AC153, AC188 PNP Germanium transistor. Genaue Daten und Kennlinien finden sie im Datenblatt. AC128 Germanium PNP transistor. The maximum View results and find ac128 transistor datasheets and circuit and application notes in pdf format. You can see the really simple NOS components here: carbon comp resistors, Mullard "tropical fish" capacitors (love this name, very accurate description Oct 1, 2012 · http://www. Aplic. 100 to 200 hFE is the typical range for this transistor (m When selecting Germanium transistors know that all versions of the Arbiter Fuzz Face Clone and the Face the Fuzz circuits come with hand-tested and selected premium AC128 NOS PNP transistors. Encontrarás artículos nuevos o usados en Transistor de Germanio Ac128 en eBay. Does anyone know the likelihood of getting a bad one if it's untested or what value is sensible for the hfe, or the effect of different hfe values with regard to a Fuzz effect pedal? Mar 18, 2011 · Germanium Transistor high Hfe; Germanium Transistor high Hfe. Choose your hFE range, higher number is higher gain. This is usually not accounted for when builders select transistors. May 7, 2024 · So I'm getting parts together. It Jul 29, 2019 · Supposedly a number of the earliest Fuzz Faces were made with AC128 Transistors - but very few of those have surfaced - possibly just lab prototypes. 9 hfe and 253 hfe. May 7, 2024 · How do I hook up the on-on switch to this strip board for this circuit to work. or Best Offer +$8. Multimeters are designed to test silicon transistors, which have de minimis levels of current leakage, on the order of a En eBay encuentras fabulosas ofertas en Transistor de Germanio Ac128. first, for a fuzz face, you want the first transistor to be around 75 and the second around 120. 22V / tf=120ns: No more AC125 transistors, but this is another great Fuzzbox Transistor for those in the know! This listing is for a New Old Stock 3AX31B Blue Dot PNP Germanium audio transistor suitable for use in Tonebender style guitar fuzz boxes or as a replacement transistor in the preamplifier stages of many 1960's transistor radios, record players and amplifiers, where it is similar to the OC71, OC75 AC126 Datasheet, Equivalent, Cross Reference Search Type Designator: AC126 Material of Transistor: Ge Polarity: PNP Maximum Collector Power Dissipation (Pc): 0. We test all of our AC128’s for optimum gain and leakage current so that they are guaranteed to bias properly and sound great! We choose lower gain Dec 8, 2008 · Do you I need a BC108 with a hfe of 70-90 as recommended in a germanium Fuzz Face or a higher one for Q1? I also plan to use the usual collector resistors for Q1 and Q2 (as you used). For example, the BC108 transistor which is commonly found silicon fuzz face pedals has a gain range from 110 to 800. Operating Junction Temperature (Tj): 90 °C Transition Frequency (ft): 1 MHz En eBay encuentras fabulosas ofertas en Transistor de Germanio Ac128. I have two fuzz pedals at present, a Langtronics Fuzz (hand built in England with AC128) and a Solid Gold FX Formula 69 (Montreal builder, silicon transistors). Both are specifically selected eachone with its proper gain (HFE) for producing that magical tones. I never compared them next to each other though. 800mA. 012 W Nov 21, 2024 · Germanium PNP transistor AC128 VI manufactured by Tungsram. ¡Compra con confianza en eBay! 6 days ago · In this FF above, I used AC128 cylindrical European made NOS transistors, home-selected in hfe and Iceo, acoording to R. Silicon transistors: with higher gain are a bit harsher with some more high end. 1mA is perfect, 0. 00 . So I've been attempting to transfer this one to the breadboard I have. I’ve built great Tone Bender Mk. Much more than the reference number, what I found important on the TBMK2P is : 1/ the Hfe - choose around 50, 2/ The Ice0 leak - check around 150µA, Since that it was probably the OC81D average "good 50pcs MP42B Germanium transistor PNP ~AC128 OC75 Tone Bender Fuzz USSR. It has an hFE (DC current gain) range of 60-120, which is ideal for audio applications. Nov 29, 2021 · Minimum & Maximum DC Current Gain (hFE): 110 to 450; Max Storage & Operating temperature Should be: -65 to 150 Centigrade . BC108 Transistor Explained / Description: BC108 is an NPN metal case transistor available in TO-18 package. Für eine genau ausgemessene Kennlinie, nehmen sie bitte mit uns Kontakt auf. Datasheet. I was wondering two things WHERE CAN I GET A MATCHED PAIR OF SILICON PNP TRANSISTORS? IS THERE ANYWHERE TO GET EUROPEAN NKT275 OR AC128'S? I THINK THE EURO'S SOUND BETTER THAN THE AMERICAN'S. 5 W Maximum Collector-Base Voltage |Vcb|: 32 V Maximum Collector-Emitter Voltage |Vce|: 12 V Maximum Emitter-Base Voltage |Veb|: 10 V Maximum Collector Current |Ic max|: 0. May 7, 2024 · The one thing I don't have is a switch. 261mA. As I remember I tested my transistors under 9Vdc, at Ib = 10µA and measured as follows : Q1 was hfe = 88 / Iceo = 100µA, Q2 was hfe = 110 / Iceo May 7, 2024 · FYI, the leakage measurement will be labeled ICEO on the tester if it's there (well that's what it is on my 328) And definitely use pliers to install the transistor into the tester or just let it sit for 5 min after handling with your hands. The one thing I don't have is a switch. 's article is attached BTW) En eBay encuentras fabulosas ofertas en Transistor de Germanio Ac128. Someone in Aron's Stompbox Forum said that placing a 100pF capacitor across the Collector-Base junction of the transistors in a Silicon Fuzz Face clone would help control the gain and Sep 5, 2024 · Germanium PNP transistor AC128 V manufactured by Tungsram. Do it just like the schematic? A wire to one side terminal and the middle terminal, then solder them to the spots shown May 7, 2024 · How do I hook up the on-on switch to this strip board for this circuit to work. So you can go to eBay & buy 20-30 transistors & test them yourself, and if you're lucky you'll have 3 in the ranges you item 2 AC128 V Tungsram PNP Germanium Transistor NOS Tested - Choose hFE AC128 V Tungsram PNP Germanium Transistor NOS Tested - Choose hFE. had in his article either). $4. the fuzz factory is an lpb1 in front of a fuzz face. Mar 23, 2019 · I'll be sure to add a few ohms in series to protect the transistors. III’s that included transistor(s) with leakages in the 500-750 μA range, but anything above that isn’t useful as anything except May 7, 2024 · What are you using to test them? If it's a multimeter, it's not going to give you an accurate hFE reading for germanium transistors. Package: X04 aluminium or steel block. ¡Compra con confianza en eBay! Oct 2, 2024 · I seen some DIY pedals with two AC128 (hfe around 100-200, but it wasn't sure), SFT337 and 2SB415, a pair of MP42B (hfe 100 and 50), ECG102 and ECG158. 7mA and 2. Jul 3, 2020 · The idea for this pedal was that I had some low gain AC128 transistors (~27 & 60 hfe) laying around, why not try and come up with a germanium overdrive. or Best Offer. Jun 24, 2024 · In this article, we are going to explain the AC128 transistor, pin configuration, features, specifications, and applications. It is quite popular transistor like other transistors of its series which are BC107 and BC109. 1 30 AC128/05 PNP En eBay encuentras fabulosas ofertas en Transistor de Germanio Ac128. Used in the early version of Arbiter fuzz guitar effect. Status: NOS (New Old Stock) Tested Components: YES . Also good for testing capacitors, inductors, resistors. 143mA. Switching circuit, Inverter, Interface circuit, Driver Circuit Built in bias Resistor (R1=10K, R2=47K) Complement to KSR2006 Absolute Maximum Ratings Ta=25°C unless otherwise noted Symbol VCBO VCEO VEBO PC TJ TSTG Parameter Collector-Base Voltage Collector-Emitter Voltage Emitter-Base Voltage Collector Current Aug 31, 2007 · On the topic of transistors, can anyone recommend a good DMM with a transistor tester? I suspect that the average DMM assumes that there is no significant leakage - fair enough for a silicon transistor - but doesn't correct for the (sometimes enormous) leakage on a Ge transistor. Ref. Free shipping on many items | Browse your favorite brands Jul 29, 2019 · Supposedly a number of the earliest Fuzz Faces were made with AC128 Transistors - but very few of those have surfaced - possibly just lab prototypes. Anything unstable was rejected. 7 0. . Everyone seems to be after the Q1 = 70-85 and Q2 = 130-140 hFE values for fuzz face. 1 The Fuzz Face Transistors. Google hfe ranges for fuzz factory. Also on a side note, I was planning on using old PNP AC128 transistors, but I'm getting values for Hfe ranging from 180 to 610. I read that a pair of germanium transistors with the right hfe should be fine, but this is still not so easy, because this transistors are rare not always selected by hfe. ¡Compra con confianza en eBay! May 7, 2024 · So I'm getting parts together. What is AC128 Transistor? AC128 is a PNP -type germanium (Ge) transistor available in the TO-1 package. Feb 22, 2011 · Okay so if I can't find germanium transistors here (in NZ), what sort of PNP transistor would I put in place of the OC44 in that booster circuit? (I can't find any of the other transistors that R. Model: AC128; Type: PNP - Germanium; hFE: 60; Leakage current: 7 µA; All our transistor are fully tested with two calibrated transistor analyzers: Metrix 302A & Metrix 675A. Working much better now, but still needs a bit of fiddling. 22V / tf=120ns: TTA2097: Toshiba Electronic Devices & Storage Corporation AC128 transistor. PNP Germaniumtransistor AC128 Handselektiert bei 20°C mit einem Leckstrom < 300µA Technische Daten: Gehäuse: TO1 Ucb= -32V Uce= -16V Ueb= -10V Icmax = -1A Ptot = 700mW Hfe = 110-120 Genaue Daten und Kennlinien finden sie im Datenblatt. Condition: NEW, NOS, straight from the factory box. Jul 20, 2010 · I recently bought some AC128 NOS PNP transistors from Dr Tweek in the UK. Jul 29, 2021 · ID hfe Ube Ic Iceo Ices Part# Type 1 81 98 1. Class w A and B output stages V TO-I Construction Measured at Tamb = 25°C Vea (IE = 0) -32 ICM max. AC128 PNP GERMANIUM TRANSISTOR ORIGINAL NEW AND TESTED AT HFE=281 LAKAGE= 1. Keeping my fingers crossed. Parameters and Characteristics. New old stock. has a low 0. All Transistors. The 2 AC128's tested at 43. Go Down Pages 1 2. Try small bear for reliability. So Dec 7, 2022 · (collector current) and V ce (voltage drop from collector to emitter). In my experience, they're much cheaper and plentiful than European, American, or Japanese germanium transistors, and have more consistent device AC128 Transistor The AC128 transistor is a PNP style Germanium transistor, the sister of her NPN counterpart AC127. Some transistors have huge tolerances where others are much tighter. GT402J ~ AC128 Germanium P-N-P transistor, 40V , hfe 30-80 P=600 mW PNP. AC128 PNP GERMANIUM TRANSISTOR ORIGINAL RS NEW AND TESTED AT HFE=117 LAKAGE= 0. 90 +$7. 2MHz, 0. 5mA is just plain bad), and hFE = 95. NOS from 1970's. All transistors were tested using Peak Atlas DCA Pro semiconductor analyzer. 5mA are extremely high levels of leakage. GT1322 - Ge, PNP, 32V, 0. Don't worry about the HFe of the 2n3904, silicon transistors are much more consistent. The hFE and leakage for this transistor is measured again, using the same circuit, but this time for an PNP transistor. II and Mk. These are sort of a RF transistor, i add 47pf across the C-B to tame some of the icepick. The AC128 is a bipolar junction transistor (BJT) with an PNP-type configuration. Transistors in this circuit are critical. if we dont have it we know where to find it. 15W 0. (R. I have a few old PNP germ trannies to try, some OC72 (hfe between 56-98), a few AC128 (hfe around 120) and some 2sc270, OC44, OC71. 2W, HFE=4066 Equivalent to: SFT322, AC128, 2N2706, NKT275. 99 shipping. Apr 4, 2023 · We can also source other hard to find transistors silicon or germanium. 2mA is fine, more than 0. This transistor has three terminals Base, Collector, and Emitter. 01 NPN Silicon Planar Transistor for low-level audio applications Others with the same file for datasheet: BCY70, BCY71, BCY72, NKT10419, NKT10518: Download BC108 datasheet from Newmarket Transistors NKT: pdf 857 kb : NPN General Purpose Transistor: Download BC108 datasheet from Philips: pdf 53 kb : GENERAL PURPOSE SMALL SIGNAL NPN BIPOLAR TRANSISTOR. So it does not really look good to me. I'm just using a cheap multimeter to measure Hfe, I don't have a proper transistor-analyzing instrument. EXPERIENCED is equipped with 2 transistors Germanium type, AC128, brand MULLARD. Sep 5, 2024 · Germanium PNP transistor AC128 V manufactured by Tungsram. AC128, 2-AC128---P-N-P Germanium alloy high gain transistor. AC128K Datasheet, Equivalent, Cross Reference Search Type Designator: AC128K Material of Transistor: Ge Polarity: PNP Maximum Collector Power Dissipation (Pc): 1 W Feb 11, 2008 · I've tried various values for a PNP Germanium Transistor SPICE Model and found that in order to reduce Vbe to an acceptable level (approx. cross-reference search, transistors, equivalent. mod: AC127 PNP Germanium Transistor Model Subcircuit File ac128. The AC128 transistor, also known as the AC128 Germanium PNP Transistor, is a pivotal element in electronic circuits, capable of amplifying weak signals and controlling the flow of current with exceptional precision. The AC128 transistor has a voltage rating of 30V and a frequency range of up to 1MHz. I have Russian cheap mp21ds as a preference. That means the AC128 transistor has a negatively charged layer between two positively charged layers. Opens in a new window or tab. They sound fantastic. The ZXRD060 Precision Shunt Regulator from Diodes Inc. I've heard that the best sound comes with the first transistor hfe= 85 to 95 and the second one at 100+. I've got 2 others to test. Tenemos la selección más grande y las mejores ofertas en Transistor de Germanio Ac128. My knowledge of hFE range of BC183s are between 40 and 800. &quot;P416B - Average hFE 85, leakage under 10µA. Many retailers are selling ready matched sets of transistors. MP42B Black Germanium transistor PNP ~AC128 OC75 Tone Bender Fuzz USSR 16pcs. Each transistor come with his test report. Depending on the type of transistor, the amount of gain available can vary substantially. That said as with any Transistor variety here - the AC128 does not have to be restricted to Fuzz Faces, and it's found its way into some Tone Benders and Big Muff derivatives even. comHow to Test Germanium Transistors - We use these AC128 transistors in our Fuzz Face Clone Pedal Kit. Some commonly suggested alternatives include the NPN transistors AC128, AC188, and AC187, or the PNP transistors AC126, AC187, and AC188. We won’t use this germinium transistor, but a good SPICE model exists for this transistor, as part of the LT wiki components library and circuits: standard. Aug 23, 2021 · What should be the Q1 and Q2 hFE values? I think that Q1 value should be less than Q2 but what should be the differences between Q1 and Q2 Ex: Q2= Q1+100hfe? Another option is don't bother with buying big quantity transistors and buy matched BC108 transistors and pay around 14$ per set. PS:i liked the small bear american ge transistors but would like the european transistors of ge May 25, 2011 · With the Zonk, everything points to trannie selection being paramount. 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 . There are two main possibilities: Germanium transistors: are claimed to have a warmer, creamier smoother sound. - the base of Q1 sets at -0,6V DC which is typical for silicium but not for a germanium transistor. AC128 PNP GERMANIUM TRANSISTOR ORIGINAL USED AND TESTED AT HFE=42 LAKAGE= 0. High Gain Selected Pair. So I'll be keeping the 43. 562mA. 203M resistors as well as a battery with 9. AC126 Datasheet, Equivalent, Cross Reference Search Type Designator: AC126 Material of Transistor: Ge Polarity: PNP Maximum Collector Power Dissipation (Pc): 0. Technische Daten: Gehäuse: TO1 Ucb= -32V Uce= -16V Ueb= -10V Icmax = -1A Ptot = 700mW Hfe = 100-110. The AC127 is actually an NPN transistor. 25A, 1. hFE: 50 - 160. 5 1. - even with the Gain set low, it distorts the input signal a lot. I bought what are supposed to be PNP Germanium AC128 transistors for a Fuzz Face build, yet when I measure them with my meter, I get 915 hfe for both. Follow the figures for the correct position of the transistors. Leakage is 0. Besides being in the famous original Fuzz Face, the AC128 was used in numerous domestic electronic appliance, and certainly one of the most common European transistor. mod: AC128 PNP Germanium Transistor Model Subcircuit File The two files are both listed as PNP transistors as shown above. transistor equivalents guide by adrian michaels bernard babani (publishing) ltd the grampians ac128 g p pp. 00. 200mV) reduces the hfe (gain) to negligible response with BF (Beta Forward) at nominal 50-100 value in a working SPICE CAD preamplifier circuit. com. Looking for a specific hFE?. Ideal for Fuzz pedals. AC128 Transistor Explained / Description. *Note, germanium is temperature sensistive, these were measured in a warehouse ~70 ° F. Ac 125. All pin orientations are shown as you are looking at the bottom of the transistor. Forward Current Transfer Ratio (hFE), MIN: 52 Noise Figure, dB: - Tungsram germanium Transistor AC128, NOS condition. It appears PNP Germaniumtransistor AC128 Handselektiert bei 20°C mit einem Leckstrom < 300µA Technische Daten: Gehäuse: TO1 Ucb= -32V Uce= -16V Ueb= -10V Icmax = -1A Ptot = 700mW Hfe = 290-300 Genaue Daten und Kennlinien finden sie im Datenblatt. NPN TRANSISTOR DESCRIPTION: The CENTRAL SEMICONDUCTOR AC127 is a germanium NPN transitor designed for small signal general purpose applications. 5 W No more AC125 transistors, but this is another great Fuzzbox Transistor for those in the know! This listing is for a New Old Stock 3AX31B Blue Dot PNP Germanium audio transistor suitable for use in Tonebender style guitar fuzz boxes or as a replacement transistor in the preamplifier stages of many 1960's transistor radios, record players and amplifiers, where it is similar to the OC71, OC75 4 pcs. ¡Compra con confianza en eBay! May 7, 2024 · You can always buy one of those MK328 testers for $20 and not have to build the RG device. The AC128 transistor symbol shows an arrow from the emitter into the base. NPN Bipolar Transistor / hFE=400~1000 / VCE(sat)=0. Status: NOS (New Old Stock) Tested Components: YES all Hfe over the minimum 55RoHS compliant: no 4 days ago · First post here at DIYStompboxes. I've managed to round up 2. 9 and pairing it with one that's hopefully a little lower than 253. This is crucial. Google fuzz face transistors. you could just be experiencing issues because of the transistors not being ideal. 473k and 2. 91. 0 AD140-P-N-P power junction transistor b AOl40 T0-3 Construction Ptot max. 1. 89 shipping. May 20, 2007 · With Silicon it becomes very difficult to stick with the Q1 hfe of 70 and Q2 hfe of 120, because most Silicon transistors are way over 120 to begin with. 158mA. EDIT: Yup, turns out it was the transistors; HFE was waaaay too low. I set the first stage up as an AC128 Darlington Pair and replaced the fixed collector Rs with trimmers. Germanium transistors are very leaky devices and they have very inconsistent β (beta)*. The text inside the model file is correct, just the labeling of the file is wrong. that are in my original 1972 FF also have an hfe of 500 The AC128 PNP Ge's that were in the original model rate out at 90 May 10, 2011 · A friend (DIY) used AC128 I made a TBMK3-3K with AC180 So your array of transistors would probably do, if these are in good condition. 5 W MP38A MATCHED PAIR hFE SOVIET GERMANIUM NPN TRANSISTOR 0. Selected 1 at 151 to 200 hFE Selected 1 at >200 hFE Transistors will be labeled with hFE rating. Home / Transistors / AC128 Mullard Metal Can Germanium £ 5. To choosing an specific hFE transistor, please enter here and add one of this product for each transistor you want to be matched or selected. 02A ~ AC173 AC176. May 7, 2024 · AC128 PNP GERMANIUM TRANSISTOR ORIGINAL NEW AND TESTED AT HFE=125 LAKAGE= 0. Apr 9, 2013 · ac127. I understand very little about transistors and their classisfications. Diodes Inc. Dr Tweek has made me a happy man Download 2-AC128 datasheet from mble: pdf 279 kb : Germanium P-N-P Germanium Medium Power Transistor Others with the same file for datasheet: 2-AC128/1, AC128, AC128/1: Download 2-AC128 datasheet from Mullard: pdf 1410 kb : PNP germanium alloy transistor Others with the same file for datasheet: 2-AC128K, AC128K: Download 2-AC128 datasheet from What about the three-transistor set for the Sola Tone Bender Professional Mark II? The second and third stages are exactly the same as in the Fuzz Face, and the first stage needs one that measures from 75-100. AC128: 48Kb / 1P: GERMANIUM SMALL SIGNAL TRANSISTORS List of Unclassifed Man AC128: 566Kb / 4P: GERMANIUM SMALL SIGNAL TRANSISTORS AC128: 2Mb / 31P: SEMICONDUCTORS Teledyne Technologies I AC1286 161Kb / 2P: 650 TO 1200 MHz TO-8 CASCADABLE AMPLIFIER New Jersey Semi-Conduct AC128K 48Kb / 1P: GERMANIUM SMALL SIGNAL TRANSISTORS List of I used paint markers to add a color dot representing a range of leakage (with the “buckets” getting bigger as leakage goes up — the difference between 50-100uA matters about as much to me than the difference between 500-1000uA) and then bagged them in groups by hFE figuring that a range of 5-10 is close enough for pedal purposes. AC128 PNP Germanium. The first FF's manufactured in the UK used the AC128, a 45-165 Hfe European germanium PNP transistor, cheap/common at that time (later on replaced by the Newmarket NKT275). Previous topic - Next topic. AC128 transistors are a popular choice for fuzz and overdrive pedals: used in the right configuration, the performance curves on these selected transistors will give that classic roundness only attainable with original germanium technology. Multimeters are designed to test silicon transistors, which have de minimis levels of current leakage, on the order of a May 7, 2024 · FYI, the leakage measurement will be labeled ICEO on the tester if it's there (well that's what it is on my 328) And definitely use pliers to install the transistor into the tester or just let it sit for 5 min after handling with your hands. from Ukraine When selecting Germanium transistors know that all versions of the Arbiter Fuzz Face Clone and the Face the Fuzz circuits come with hand-tested and selected premium AC128 NOS PNP transistors. 1 A Max. G. Alternative for using in Fuzz Face are BC109, BC183, BC108, BC108C, CV7005, NKT275 . I'd like to try my hand at building a fuzz pedal, perhaps a Tonebender MKI or II. AC128 Germanium PNP Transistor in box. Collector Capacitance (Cc): 200 pF. The magical tones come out when the first transistor' gain is around 60 hfe and the second one (Q2) with 120 hfe. pbid yjqb afxyou skz lxezf zohjoabr yztveho popdi uyeyy molkni