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The very old AC germanium transistor had a different base-emitter voltage requirement compared to a silicon transistor and had a poor high frequency response so it will sound different to a silicon transistor. Accelerometer Demo running on 8-bit S08 AC in data averaging mode.

We should start a FAQ to collect all this info in one place. Maybe, if you live near a mainframe junkyard. Hey there folks, Just wondering how you all go about buying germanium transistors in bulk.

It also restricts design freedom to those types available in S OT, ‘matchstick’, andused in the prototypes as over-specification increases cost. Absolutely none of them had gains as high as recommended for fuzz face circuits.

AC Datasheet, PDF – Alldatasheet

My GTV transistors read vastly different though, which isn’t surprising given that the spec av128 of is at 10mA emitter current whereas the geofex circuit feeds about 20 times less than that. High gain low leakage low noise germanium transistors are practically unicorns now. No, create an account now. I wouldn’t have thought so but I’ve seen that be the case with guitar pedal stuff.



Are you saying that without these particular transistors I won’t get the fuzz sound? This is an open community for the do-it-yourself pedal builders of reddit! Still you might get lucky or find the right seller, but beware, it’s rough out there.

Picking transistors for FF Clones. Please read this first!

AC128 Datasheet

Both seem to be specced at hFE. Message 1 of Now it could be that Tansistor manufacturing just sucked or that they’ve been picked over for the good ones. Good luck to your fuzz tones design.

For a typical Ge transistor, the ON voltage ranges from 0. Pnp transistor Posted by Peter basolo in forum: Info about building and modding: Here’s another thing that isn’t really mentioned often: At the current specified in the datasheets?

Does anyone know the likelihood of getting a bad one if it’s untested or what value is sensible for the hfe, or the effect of different hfe values with regard to a Fuzz zc128 pedal? I’m no good at guitar but that should give an idea of what it sounds like. I just got some AC transistors from ebay and the rest was from newark.

AC transistor datasheet & applicatoin notes – Datasheet Archive

Some transistors that have the right gain and low leakage can still be very hissy. Mar 3, 1.


If you find low gain on all your MP40s, it could be that you’re testing under different conditions than the datasheet specifies. Aug 9, 9.

You can also go to ebay and search for “transistor tester” and there are a bunch of devices where you can just plug the transistor in and it’ll tell you gain and leakage and which leads are base, collector, or emitter. Message 2 of They’re made in China. No file text available. I’ve found some ac on ebay too so will give this a go.

Not a lot higher, but at least in spec. The rumours I’ve heard is that some resellers purchase a big bulk collection, sort all the best transistors out maybe 1 in 10 if thatthen sell the leftover dreck to the next sucker. PNP transistor help Posted by vilaemail in forum: Aug 9, 4.

Most Active Software Boards: They are surplus, mostly from radios and other basic applications. Unless there are a lot of Bulgarian component distributors it’s probably the same dude. I sold it a long time ago and never finished the second one so this video is all I have at the moment.

Dec 20, 10, 1,