The AC175, what is it good for?

Frequently asked question on transistors: types, substitutions, how to test, use and misuse them.
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noelgrassy
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Post by noelgrassy »

As the title sez, what are these good for? I happen to have a few with the hole in the top of the "radiator". They're NPN and that's about all I know. They give pretty weird readings on my DMM. Thanks in advance, NG

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Meanderthal
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Post by Meanderthal »

Heh- they're good for a neg. ground germanium fuzz. As long as the gains are good, and they're not too leaky...

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modman
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Post by modman »

I had a batch, with good gains, great fuzz and sustain, but they were incredibly noisy in my tonebender mark II.
Don't let anything keep you from trying though.
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noelgrassy
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my favorite amplifier: MOTS Magnatone & Trainwreck
Completed builds: Tonebender Mk II w/ 3 OC75's, Burns BuzzAround w/NKT 275,Rangemaster w/ OC44, Fuzz Face w/ SKS363's, CJOD, Harmonic Percolator w/2N404A & 2N3635(vintage correct box,sliding pots, 1%glass resistors),Stack-O-Dimes & Whipple Wahs,
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Post by noelgrassy »

Thanks guys. Yeah the Hfe [if I'm reading them right] is way up there. I have to go buy a breadboard device now...

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Meanderthal
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Post by Meanderthal »

Leakage might be throwing the measurements off... but a neg ground fuzz is a beautiful thing when it works out. Sure as hell worth a try!

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