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Germanium MM/MC Head Amp
Germanium MM/MC Head Amp
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Old 12th January 2019, 11:17 AM   #11
ColinF is offline ColinF  United Kingdom
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Good that you’re fiddling with germaniums. On the nfb designs the input impedance varies with frequency, and on some of the circuits the input impedance is also very low, difficult for a MM cartridge to drive without rolling off in the top end.
Have you tried using them in a headphone amp circuit?
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Old 12th January 2019, 02:04 PM   #12
Mooly is offline Mooly  United Kingdom
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Germanium MM/MC Head Amp


Posts discussing germanium devices for use in MM/MC head amp designs have been split off from original headphone amp thread.
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Old 23rd February 2019, 06:51 PM   #13
Svjatoslav is offline Svjatoslav  Ukraine
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Originally Posted by ColinF View Post
Thanks for the info. I have a reasonable selection of old Ge transistors so Iíll look in there for some AF379s. Perhaps the MC head amp with germaniums could be a reality after all. Do you have to hand the rbb for it?
Not quite germanium. But still.
Германиевый усилитель для наушников. (разработка) - Страница 3 - Форум
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Old 26th February 2019, 12:16 AM   #14
vsmusic is offline vsmusic  Russian Federation
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Was more successful schemes germanium fono . For example Shure M-61, or Telefunken TV-206 . The supply voltage of 30 to 32 volts . I was made 2 devices on these schemes . Sound very good .I use them for several years .Vinyl Engine -Germanium phono preamp (5) , Vinyl Engine -Germanium phono preamp (3) , Vinyl Engine -Germanium phono preamp (7) , Vinyl Engine -Germanium phono preamp (8)

Last edited by vsmusic; 26th February 2019 at 12:24 AM.
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Old 26th February 2019, 08:47 AM   #15
davidsrsb is offline davidsrsb  Malaysia
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Are germanium transistors actually low noise at audio frequencies, the crystal purity and cleanliness was just not that good in their time? Add that germanium has no passivation method equivalent to silicon oxide or nitride, so long term contamination and corrosion is possible.
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Old 26th February 2019, 11:20 PM   #16
PRR is offline PRR  United States
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The early Ge parts were horribly hissy. We were still getting them into the 1970s in low-low-cost gear.

The Russians made a LOT of Ge devices after the rest of the world had the fad for Silicon. I hear reports that some of the Russian devices were quite low noise. Russian Ge is readily available as new Russia cleans-out the USSR military back-inventory. Which ones are "quiet" I have no idea.

Aside from the passivation techniques found for Silicon, it was the custom to pot Ge with greases or solvents (benzene) to reduce surface states as well as improve cooling.
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Old 28th February 2019, 01:09 AM   #17
vsmusic is offline vsmusic  Russian Federation
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I used the transistors AC-122 ( Telefunken ) . Noise level they have the same as the transistors of the USSR . h21e they have more than the transistors of the USSR . . Germanium Phono had more noise than silicon devices . But also-had a great sound .
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Old 15th May 2019, 02:30 PM   #18
Svjatoslav is offline Svjatoslav  Ukraine
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Quote:
Originally Posted by Jenyok View Post
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The sound of germanium transistors is much closer to a tube sound, than silicon transistors.
There is "Warm tube sound".
He is often even better than a tube. Not to mention silicon.
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Old 17th May 2019, 01:51 PM   #19
Mark Tillotson is offline Mark Tillotson
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Some of us actually want a transparent amp that doesn't pollute the signal with "warmth" or any other woolly adjective! Uncorrupted signals please. The idea of using low performance Ge transistors is unappealing except perhaps from a retro perspective - sure its a design challenge, but its not going to be the best way...



The original comment about low noise of the AF379 completely ignores the flicker-noise knee frequency - 600MHz capable RF transistors' noise specs seldom give this, and typically noise increases with decreasing frequency, sometimes dramatically, you cannot infer audio noise performance from RF noise performance - you'd have to measure it rather than extrapolate from 100MHz data.
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Old 17th May 2019, 02:26 PM   #20
analog_sa is offline analog_sa  Europe
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Originally Posted by Mark Tillotson View Post
Some of us actually want a transparent amp that doesn't pollute the signal with "warmth" or any other woolly adjective!
Do you assume the preamp under discussion has such flavour? Why? Harmonic spectrum? Noise? Are either of these really excessive?

A "transparent amp" is an unattainable ideal, real amps are all about trade offs and compromise.
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