This movie brings back memories of the hundreds of Ge transistors i have decapped. Some decapitations were done for science as it was an easy way to create a phototransistor. No idea why those were fascinating but i am sure they were. Other of the fallen Ge heroes were full of thermal grease which i used to squeeze mercilessly down to the last drop whenever a heatsink needed greasing. The cruelty of young age. At least i left snails alone.
Imagine Ge's 2SB206 etc. green light curve traces show on the screen of Mr. MR Tektronix 577 Germanium investigations 
Curious what amplifier Mr. Pass friend swear about desirable audio germanium output power stage quality.
Guesses high level of expectations with such long audiophile experience.
Intriguing message
Guesses high level of expectations with such long audiophile experience.
Intriguing message
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Anyone who has a pair of power Ge can listen to the 60x sound 🙂
Bias and co. in a 1960s SS amp Hohner Electra Piano
Amplifier Lin (RCA) with Shaw diode.
Усилитель на германиевых транзисторах Радио 1970 №2 Иванов - YouTube
Bias and co. in a 1960s SS amp Hohner Electra Piano
Amplifier Lin (RCA) with Shaw diode.
Усилитель на германиевых транзисторах Радио 1970 №2 Иванов - YouTube
@ Old DIY
Thanks for the links 🙂
Germanium from old Soviet Union are interesting semiconductors:
unique sound character and " build like a military tank " manufacturing quality.
Home made heatsink for small signal Ge on the photo.
Source : Простой германиевый усилитель мощности - Усилители на транзисторах -
Звуковоспроизведение - В помощь радиолюбителю
Thanks for the links 🙂
Germanium from old Soviet Union are interesting semiconductors:
unique sound character and " build like a military tank " manufacturing quality.
Home made heatsink for small signal Ge on the photo.
Source : Простой германиевый усилитель мощности - Усилители на транзисторах -
Звуковоспроизведение - В помощь радиолюбителю
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With all do respect. There are Ge transistors with decent frequency response. I quit using old МПхх transistors being 13 years old. Newer ГТ series are much better. I would doubt "the quality" of transistors mentioned, mostly used in Royer oscillators and linear regulators, made at times when the trees were high.
Try find like ГТ703/ГТ705 with ft of 10 kHz. Complementary pair. Really shines in megaphones.
http://forumimage.ru/uploads/20171030/150938171845856984.jpg
http://forumimage.ru/uploads/20171030/150938303618235764.jpg
Try find like ГТ703/ГТ705 with ft of 10 kHz. Complementary pair. Really shines in megaphones.
http://forumimage.ru/uploads/20171030/150938171845856984.jpg
http://forumimage.ru/uploads/20171030/150938303618235764.jpg
Ge transistors tests in proper class A circuits with the Audio Precision tool can bring a lots of aswers.
BTW one Shindengen 2SB206 auction Dissipateur thermique avec Sanyo 2SB206 transistor de puissance | eBay
Good luck
BTW one Shindengen 2SB206 auction Dissipateur thermique avec Sanyo 2SB206 transistor de puissance | eBay
Good luck
@ Vsmusic
Fantastic work! Congratulations
Could You write more informations about specyfications and audio performance ?
Best regards
Fantastic work! Congratulations
Could You write more informations about specyfications and audio performance ?
Best regards
Soundhappy The first product is an upgraded version of the 1972 scheme . Measurements using RMAA showed this result-the noise level is minus 73 dB . Harmonics - 0.044% . The measurement was made at the signal level at the preamp output of 2 volts from peak to peak . Gain greater than 40 dB . The product is powered by a VRLA - 24 V battery (2x12 V / 0.8 a / h). The scheme has a rumble filter .The indicator shows the signal level and battery level. The battery receives a charge from an external automatic device .... The sound of this product is good . I use it in conjunction with the Kenwood KP-770d player and the Empire Broadcast one cartridge .
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Soundhappy - The second device is an upgraded Telefunken TV-206 scheme . One transistor is added at the output . The gain is about 42 dB . The noise level is minus 73 dB ( at the output of 2 volts from peak to peak). Harmonics-0.016 % . RMAA . Power can be supplied from an external stabilizer 32 volts .
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The third device is also made according to the Telefunken TV-206 scheme . Differs from the second product - a different type of capacitors in the correction circuits . This copy was made for a friend of mine .
Preamps on germanium transistors provide a very good sound-three-dimensional, with a beautiful transmission of voice and acoustic instruments . I like these preamps . I have been using one of them for about 5 years . I have preamps on both silicon transistors ( BC149C / BC550C/ BC560C) and JFET transistors (2SK170 ) . But I like the germanium preamps better ....These were experiments , and they are still ongoing - I am building another preamp . And this will be another germanium scheme .But there is still a lot of work to be done .
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@ Vsmusic
Thanks for sharing Your wonderful interesting DIY work. Very kind.
Yes me too i like it , after limited audio experiences they surprise me by his own amazing sound character.
Germaniums a semiconductors from " another planet "
Scanned and cleaned up Wireless World Articles https://www.keith-snook.info/wirele...rld-1961/Transistor Audio Power Amplifier.pdf
https://www.keith-snook.info/wirele...5/Transistor High Quality Audio Amplifier.pdf
