Hi all, just finished the Aft preamp and I used a 2N2222A since I didn't have an Oc139.
Hfe was 275. It's super noisy, almost microphonic and seems like there's almost a delay before the sound kicks in. Just a weird vibe.
The OC datasheet I looked at had the Hfe about 33. So my dumb fault for not doing my due diligence first.
Fortunately I have a solder station with a rework gun so I can desolder it.
Are there any suitable silicone replacements that may work instead, or should I flip it, and the electrolytic capacitors and use a PNP. If so, any recommendations?
Thanks everyone
Hfe was 275. It's super noisy, almost microphonic and seems like there's almost a delay before the sound kicks in. Just a weird vibe.
The OC datasheet I looked at had the Hfe about 33. So my dumb fault for not doing my due diligence first.
Fortunately I have a solder station with a rework gun so I can desolder it.
Are there any suitable silicone replacements that may work instead, or should I flip it, and the electrolytic capacitors and use a PNP. If so, any recommendations?
Thanks everyone