found this in an old record player..

[marshall-gibson]

hello,

i've taken an old record player apart today,and got what apears to be some old germanium transistors,,
the code on them sayes-
sanyo 2sd30
        2sb22
also got two 1m pots and some more old transistors..
can you tell if they can be used in pedal project? maybe a tonebender??
:? [/img]

[petemoore]

Not as easy as you can.
 For a definitive answer Check out GEO Technology of the FF and Dallas Treble Booster articles, in there also is a Ge' transistor checker, tests for gain/leakage.
...use a FF with sockets, a DMM, your ears, and a [or two] trimpot at least as Q2's Collector Resisto [my FF testbaord is full of sockets and trimpots].

[Paul Perry (Frostwave)]

2SB22 is a pnp Ge, but the 2SD30 is Si npn. According to a book here.

[marshall-gibson]

thanks guy's!

i have a tonebender clone with NOS Mullard OC76 ,i've switched them around with the sanyos,and it worked with the 2sd30 just as good!
:shock:

[Bernt]

My book says that 2SD30 is a Ge NPN.

Bernt.

[petemoore]

You can check the polarity of the B/E Diode and see whether it's an NPN or a PNP./

[Bernt]

Sorry.
What I wanted to stress  was that the 2SD30 is a GERMANIUM not silicon transistor.
Bernt.

[Paul Perry (Frostwave)]

It wouldn't suprise me if the 2SD30 was Ge.
It's Si in my 1977 Semicon transistor index, but that could be wrong, for sure. They have the manufacturer as "Tokyo Sanyo" FWIW.