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Vintage threads from the first ten years

Germanium transistors

2/11/2001 3:32 AM
Aharon	Germanium transistors I got some germaniums and I'd like to know if they are good candidates for a FF.I cross refferenced at NTE and they came out for the2SB173B=NTE102A and for the 2SB171B=NTE158.The replacement pinout is TO-1,do they correspond to the old ones?.Thanks,AC.

2/11/2001 5:56 AM
Joe Gagan	I am not sure about the pinout from Nte, but those 2Sbs usually have a dot [red or black] for the collector, and the middle is base. Provided they are not leaky [read Rg Keen's info on FFs and testing for leaky germaniums], those will be very nice for a Fuzz Face. It is always a good idea to use the 10K trimpot instead of the 8.2K resistor at the collector of Q2. There are also more biasing options available on Aron Nelson's Hornet. I always like a silicon and germanium mix , personally. 2N3906 or eqiv on Q1 and 2SBxxx etc on Q2. Then you can build two fuzzes with the germaniums you have.

2/11/2001 5:56 AM

Joe Gagan

I am not sure about the pinout from Nte, but those 2Sbs usually have a dot [red or black] for the collector, and the middle is base.

Provided they are not leaky [read Rg Keen's info on FFs and testing for leaky germaniums], those will be very nice for a Fuzz Face.

It is always a good idea to use the 10K trimpot instead of the 8.2K resistor at the collector of Q2.

There are also more biasing options available on Aron Nelson's Hornet. I always like a silicon and germanium mix , personally.

2N3906 or eqiv on Q1 and 2SBxxx etc on Q2.

Then you can build two fuzzes with the germaniums you have.

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2/11/2001 2:27 PM
Aharon	Thanks Joe,they do have a red dot.I'll test for leakage.Cheers.AC.

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