You like the Germanium sound? This shows a 1 transistor Germanium pre amplifier & tells more (text)
Please read the description first for a better understanding of this video and why I made it in this way + the corrections, especially when I am talking about the Japanese code of transistors. Sorry that that was not very correct.
When you like the sound of Germanium transistors in audio amplifiers (I am not very sure about that, anyway, I have to study that sound effect much better) you can use this 1 transistor Germanium transistor pre-amplifier.
After this pre-amp, you can amplifier further with Silicon transistors or a Silicon end amplifier. Because you have, at its first stage, that Germanium amplifier.
You can use any Germanium transistor in this circuit, as long as its Hfe (current amplification factor) is between 10 (that is the lowest value, much better = 30) and (say) 70. An amplification of 10 can be too low, test that with your transistor tester.
A Hfe between 30 and 70 is better and a common value for those days, the 1960’s and the early 1970’s, for these Germanium transistors. Of course these Hfe values (30-70) are also very OK now, in 2023.
These early stage Germanium transistors can now (2023) still work properly, because the Germanium technology of those early days was studied in a very broad scale (I mean: in a scientific way). NPN transistors were, in these very early days of the transistor (1960's) less easy to make.
And/but, apart from that, all the manufacturers of Germanium transistors in those days (early 1960’s-1970’s) Philips, General Electric, Philco, and I have surely forgotten many of them in America) payed enormous attention to the quality of their transistors.
Every transistor was in those days (1960’s-early 1970’s) extensively tested, before being sold, and especially for the military and the rocket science (1960’s-1970’s) there were very strict quality rules.
By the way: these standards are a reality even now (2023): for the military certain electronic chips have to hold on to specific properties, regarding: shielding, un-sensitivity to ionization rays, mechanical stability, maximum temperature range, extremely cold and idem hot, etc.
These quality factors for electronic components (also: R, C, coils, chips, processors, etc.) are “a sea to drink”.
So in this video I am surely not going to deep dive into that. Correction (in a certain way) The Japanese codes to name their transistors was/is: "1SB" or "2SB", etc. Followed by the specific type number. That is, of course, not the JEDEC code or the pro-electron code, anyway, no problem. You have of course a transistor tester to find everything out.
The only focus in this video is this good quality PNP Germanium transistor audio amplifier.
My You Tube channel trailer is here: • Radiofun232 on YouTube (updated monthly)
When you search, search always “NEWEST FIRST” to get the right overview. You can also search via the “looking glass” on my Channel trailer via keywords like ”audio”, “radio”, “amplifier”, “filter”, “Shortwave”, “transistor”, “FET”, “oscillator”, “generator”, “switch”, “schmitt trigger” etc; so the electronic subject you are interested in.
My books about electronics & analog radio technology are available via the website of "LULU”, search for author “Ko Tilman” there.
https://www.lulu.com/search?adult_aud...
I keep all my YT videos constant actual, so the original video’s with the most recent information are always on YouTube.
Search there, and avoid my circuits that are republished, re-arranged, re-edited on other websites, giving not probable re-wiring, etc. Some persons try to find gold via my circuits. I take distance from all these fake claims. I cannot help that these things happen. Upload 8 November 2023.
Germanium 1 transistor NPN transistor for an audio amp application is here
• Germanium 1 transistor audio pre ampl...
Though that NPN-GE transistor circuit is more modern.. The idea of this video now (8 nov 2023) was to use a real old PNP Germanium transistor, out of the 1960's.
NB: read the heavy censorship on my YT Channel via my Channel Trailer "radiofun232 on You Tube".
Situation 10 November 2023.
