![]() ![]() ![]() The fuzz face is an analog device connected with the guitar and provides different tones or effects in guitar sound. As the technology of transistors progresses, newer silicon transistors are being replaced by these older transistors which are more accurate, reliable and good performers as compare to these older germanium transistors and hence the companies that were making these transistors gradually discontinued their manufacturing.īut some of these transistors are still well known by some fuzz face makers and users. In that time it was a common transistor like AC128. NKT275 is an old germanium transistor that was available around 1960’s. NKT275 Transistor Explained / Description Max Storage & Operating temperature: 90 Centigrade.Minimum & Maximum DC Current Gain (h FE): 70 – 130.Max Collector Dissipation (Pc): 200 Milliwatt.Max Collector-Emitter Voltage (V CE): 15V.Some of them have сomplementary types: ГТ402 (pnp) and ГТ404 (npn).Īs per my experience they are actually low-noise and stable ones.Advertisements Features / Technical Specifications Many of them hard to find even in Russia (like popular ГТ402И (GT402i) which is good choice for Fuzz Factory clones). The letters are given to distinguish them by Hfe, max collector-emitter voltage (like ГТ402Б (25V) and ГТ402И (40v)) etc Low noise GE transistors: МП13Б, МП39Б suitable for first input stage. Low noise GE transistors: П27, П27А, П27Б, П28 suitable for first input stage. ![]() ![]() Many of them (not all) have 1T version, wich is the same but selected, graded version, sometimes even with mentioned in datasheet higher Hfe) Numbers after letter - number of design and specifications. Next appears silicon transistors - their names starts with KT (english KT) and 2T (graded version, military etc, in russian tradition - "5" ("military") acceptance).Įxample of KT transistor is famous sub for 2N5088: russian KT3102E with hfe 400-1000 used in russian BigMuff's. Sometimes even usual ge transistors (П, МП, ГТ) have a rombus marking - OTK marking or military grade, selected version. Russian letters (as it goes in Russian alphabet):Įtymology of names: russian letter П (english P) meant transistor (полупроводник), it's early tradition from 60-s, next - МП (english: MP), modernized transistor, and ГТ (GT) and 1T (1T) germanium transistor (tradition of naming based on transistor material).ġT (not IT!) is a kind of grade (military grade, slected etc). Here is a list (name, original name, hfe according to datasheet) I have found some sites, again, all except NTE are difficult to search : Germanium Transistors - Small Bear Electronics Parametric Search | GP BJT | New Jersey Semiconductor Transistors | Germanium Transistors | NTE Electronics Comset Semiconductors - Welcome They best be audio rated, yet, I would take anything.Ħ. Lower currents may be OK, such as 10mA or, even, 1mA.Ĥ. In case this is not possible, they must be >= 30V.ģ. I would take any NPN and PNP, even, when they are not complementary ( yet, kind of, similar, to some extent ).Ģ. I have found AD161 and AD162 at AliExpress, but, these are 20V.ġ. I am extremely interested in Germanium transistors. HOW CAN AN AUDIO TRANSISTOR HAVE A CUTOFF FREQUENCY OF 10KHz IN ANY CONFIGURATION AT ANY CIRCUMSTANCES? " Common-Emitter Cutoff Frequency, fαe, at VCB = 2V and IE = 10mA : 10KHz "ĬAN YOU, PLEASE, EXPLAIN POINT 2. Attached is the datasheet.Įverything looks fine, except one thing : the datasheet says : I need help with the datasheet of NTE102A and NTE103A. ![]()
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