Datasheet for AC128/ Germanium Transistors in Fuzz Face - diyAudio
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Old 18th January 2011, 11:26 PM   #1
amallon is offline amallon  United Kingdom
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Default Datasheet for AC128/ Germanium Transistors in Fuzz Face

Hi there, this is my first post so apologies if its not in the correct place!

I'm a final year undergrad student studying Electronics with Music and need to locate a datasheet of an AC128 Transistor or similar germanium transistors used in a Fuzz Face distrotion pedal. I see that some people have posted spice models for this, however it would be great if there were some characteristic graphs that I could compare this to.

I'm quite new to all of this, so any tips would be greatly appreciated.

Cheers.
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Old 19th January 2011, 01:54 PM   #2
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datasheet at nteinc.com, part #NTE158
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Old 19th January 2011, 03:15 PM   #3
amallon is offline amallon  United Kingdom
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Thanks, I'll look into that. Had a look at some of the other stuff online and there's a bit of criticism of NTE158s Where to find fuzzface type PNP transistors? - AMPAGE Archive are there any other transistors I should be considering, and are these criticisms justified?
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Old 20th January 2011, 12:01 AM   #4
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This transistor was used in audio amps 40+ years ago and should only be used in antique equipment repairs.
If you are building a new unit: find a mdern circuit!
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Old 20th January 2011, 12:19 AM   #5
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Quote:
Originally Posted by mickeymoose View Post
This transistor was used in audio amps 40+ years ago and should only be used in antique equipment repairs.
If you are building a new unit: find a mdern circuit!
It's for a vintage FuzzFace distortion pedal for guitar. The idea is to build them as close as possible to the originals, which means using germanium transistors which are arguably what gives it its distinctive sound. Using modern silicon transistors don't achieve the same result.

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Old 20th January 2011, 12:20 AM   #6
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Oh, and by the way, the NTE parts are garbage. Don't waste your money on them.

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Old 20th January 2011, 02:01 PM   #7
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The original post was a request for the datasheet, which is there!
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Old 21st January 2011, 01:10 AM   #8
amallon is offline amallon  United Kingdom
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I'm not actually going to be building the pedal, just running some simulations on Ngspice.
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