Diodes question

[bonehead1972]

Hi guys!
I tried to Google  this but no results..
Can please somebody identify these?
Obviously germanium...i measured voltage drop around330-350mV.depends on temperature
Thanks in advance!

[mozz]

Sometimes, sometimes the color codes are correct, in your case it may be 1n54.

[Rob Strand]

In the light of not finding other options 1N54/1N54A would be something to pursue.    What you would like to find is a 1N54 datasheet which states the colors.   FWIW, the colors did't match-up with any Russian diodes.

Example of EIA coded ("resistor coded") diode numbers,
https://archive.org/details/TNM_General_instrument_germanium_diodes_1965_-_Ge_20180131_0169/mode/2up

(Some brands marked the 1N54 differently.)

[amptramp]

The 1N54 is a high back resistance diode (for a germanium, that is).  There is a 1N54A with better characteristics.  For the two diodes:

1N54 ceramic body reverse voltage 35 V, Forward current 5 mA @ 1 volt / 50 mA max / 150 mA peak / 150 mA instantaneous surge, reverse current 10 µA @ -10 V

1N54 glass body reverse voltage 50 V, Forward current 5 mA @ 1 V / 50 mA max / 150 mA peak / 150 mA instantaneous surge, reverse current 7 µA @ -10 V / 100 µA @ -50V

You have to ask yourself if anything in the design requires a high back resistance diode (for a germanium) or requires germanium at all.  Most silicon diodes are several orders of magnitude better for reverse leakage and back resistance so if silicon works, use it.

[bonehead1972]

Thank you guys

[bonehead1972]

The 1N54 is a high back resistance diode (for a germanium, that is).  There is a 1N54A with better characteristics.  For the two diodes:

1N54 ceramic body reverse voltage 35 V, Forward current 5 mA @ 1 volt / 50 mA max / 150 mA peak / 150 mA instantaneous surge, reverse current 10 µA @ -10 V

1N54 glass body reverse voltage 50 V, Forward current 5 mA @ 1 V / 50 mA max / 150 mA peak / 150 mA instantaneous surge, reverse current 7 µA @ -10 V / 100 µA @ -50V

You have to ask yourself if anything in the design requires a high back resistance diode (for a germanium) or requires germanium at all.  Most silicon diodes are several orders of magnitude better for reverse leakage and back resistance so if silicon works, use it.

Thanks for the tips!
I found these in an old junk. I supposed  they would sound cool as long as they look cool😎 haha. Anyways I have plenty of ruasian D9E diodes and they should work fine

[idy]

Look like they are just clippers, a picture of the whole board would help!

[bonehead1972]

It's a  maxon sd9 with some mods. Suggested 1n4148 diodes sound just fine but not enough gain..so I decided to try these germaniums   they sound quite  good actually

[kaycee]

The diodes are clipping the signal, they will effect volume, not gain.

[bonehead1972]

It sounds to me like less volume and a bit more gain

[niektb]

It sounds to me like less volume and a bit more gain

There is more clipping, don't confuse clipping with gain

[bonehead1972]

You are correct what  I wanted to say is it sounds dirtier

[Steben]

"relatively scaled gain"