Germanium Transistor

[rasco22862]

Hi, i found this PNP germanium transistors, are they suitable to build a rangemaster or a fuzz face.:

2SA114
2SB460
2SD72
2SD72K

Thanks

[mdh]

Why not just take a look at the GEO fuzz face article (http://geofex.com/Article_Folders/fuzzface/fffram.htm) and test your transistors for gain and leakage?  There's so much variation among Ge transistors within a part number that you can't predict affirmatively that a given part number will yield a useable transistor for a particular circuit.

[Dai H.]

2SD are NPN. FWIW I'm going through around 200 PNP mainly Japanese "2SB" Ges (so far) sorting for leakage and gain, and IMO the $11 to $16 for a usable pair offered at Small Bear (or whereever else you can obtain the equivalent) is very much worth it. Unless you get extremely lucky, I doubt you'll get the correct gains from just a couple (assuming you want the leakage/gain sorted Ges described at the GEO and Small Bear articles, etc.).

[MetalGod]

Ordering from SmallBear certainly takes out the guesswork.  All the transistors I've bought from Steve have been as he marked them for both gain and leakage - the leakage especially has been very low on all the Ge's I've got from him.