Redesign Germanium Transistor Circuits, Part 1 Today... Build Germanium Transistor Projects with Silicon Transistors! Return with us now to the halcyon days of germanium!. Germanium transistor projects intrigued experimenters from the early days in the 1950s until the early 1970s. In the Seventies, the superior silicon devices began to take over the hobby market.
The trouble with designing for germanium transistors is you're always coming up against a brick wall legended (in best spraycan graffiti style) "can't do it won't go high enough". The basic problem is germanium transistors were / are crap. Crap max.
Dec 12, 2008· The first transistors were germanium which worked well for low power transistor radios in the 1960s and 70s. But germanium transistors were unstable and not reliable. Reliable Silicon transistors were invented later. High power amplifiers could only be built with silicon transistors. The below pic shows parallel output transistors.
Does it matter if I replace germanium transistors with silicon? ... So you need to swap the plus and minus of your power supply, plus reverse all diodes. What strikes me as a bit odd on the diagrams in the article is the use of a dual power supply, with both positive and negative voltages. Also, the amplification factor of the 2N3904 may be ...
Feb 03, 2017· NaMLab and cfaed reached an important breakthrough in the development of energyefficient electronic circuits using transistors based on germanium.
The Germanium Preamp/DI is a cuttingedge design by Chandler Limited designer Wade Goeke that uses classic germanium transistors in all Class A, transformer balanced, circuits. The use of germanium devices opens a whole new sound palate not found in .
Oct 11, 2006· To my knowledge, germanium transistors are currently pretty hard to find at least in the states, and cost a bundle. The only place that appears to have a stockload of germanium transistors is Russia. I am not even sure if they are still being made here in the states, and if so the production is probably minimal.
Germanium, Transistors Semiconductor available from The official ecommerce Division of NTE Electronics, Inc. FOR QUESTIONS AND ASSISTANCE:
AD149 Power output transistors, Germanium PNP in the standard T03 package. These will replace AX1138, AT1138, 2N301, 2SB337 transistors used in the Astor car radios. Single tested transistors available or tested / gain matched pairs. I test the transistors with several different meters and hand picked the closest match from sets of 24 single units.
.rectifier that highly uniform, largearea pn junctions could be formed, together with experience on a signal transistor (the EW53, described later) enabled Wembley to make an early start in the field of alloyed germanium power transistors for use in power.
The really nice thing about NPN germaniums is that you get the germanium mojo, and you can still use negativegrounded power supplies, which lets you run NPN versions from the same AC adapter that runs your other pedals without shorting out the power supply or needing a second one.
Germanium Transistors . Audio medium power types OC72 OC81D OC81 can be replaced with an AC128, a relatively high voltage, high current device. Type AC127 is the npn complementary to the AC128. Low power AF amplifier transistors like the OC71 can be .
Sep 06, 2017· Audio preamplification transistors ex : NKT275 (Fuzz Face, 196667)These are the most common germanium transistors. They were designed for audio preamplification circuits in consumer and midrange equipment, where they quickly replaced the tubes.
Each unit ships with the ability to go from fairly clean to a bit of vintage breakup. Adjustments can easily be made with the back plate removed. Power is from a standard 9 volt or isolated power supply like the Voodoo Labs Pedal Power II. For now, the Keeley Germanium Amplifier effect pedals are only available as a handbuilt unit by Robert.
CLASSIC GERMANIUM TRANSISTOR WEBSITE AND MUSEUM The CK722 holds a unique place in the history of the transistor. Introduced by Raytheon in early 1953, the CK722 was the first low cost junction transistor available to the general public. It was an instant success.
Aug 31, 2012· (Added CBS/Hytron 2N36, 2N37 and 2N38 series of germanium PNP alloy transistors – rare devices from a little known semiconductor company. Also added 1950s Honeywell germanium power transistor tetrode prototype). UPDATED (Added TungSol 2N63, 2N64 and 2N65 series of germanium PNP alloy transistors.
Sep 10, 2004· application. With any kind of modern transistor that will eat or more. Germanium was happy with Much better when there is only supply to begin with. Chips such as LV railtorail are often totally cost prohibitive. So, is there a low cost source of new Germanium transistors? Kind of like the Russian factory Svetlana that still ...
Silicon or germanium: It is important to find out whether the transistor is silicon or germanium. It may be possible to discover this in a number of ways. If the original transistor is still working then this can be discovered by measuring the voltage across the base emitter junction when it is forward biased.
Aug 13, 2012· I'm lazy and use a Peak DCA55 to measure transistors which will automatically give you the leakage reading for germanium with the added advantage of identifying the pins for you so you don't even have to refer to the datasheet. This is an alternative from information posted by RG on the Geofex website and will allow you to measure gain and leakage for much less money.
