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 Post subject: Anyone here has a 2N301/2N2869 PNP transistor for sale?
PostPosted: Aug Thu 15, 2019 2:09 pm 
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Hello guys,

I'm looking for replacement Germanium 2N301/2N2869 PNP transistor for my Heathkit IP-27? These transistors seem to be quite hard to find and the prices are too high like $27.

Does anyone have one at a reasonable cost like within $10?

Thanks in advance

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 Post subject: Re: Anyone here has a 2N301/2N2869 PNP transistor for sale?
PostPosted: Aug Thu 15, 2019 2:17 pm 
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Joined: Sep Tue 30, 2014 6:08 am
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Location: Norfolk, VA
GE-76 can be had for less than $15, and replaces the 2N2869:

http://talonelectronics.com/shop/item.aspx?itemid=512

Or use the NTE (slightly higher, of course...):

https://vetco.net/products/nte179-pnp-t ... -ge-af-amp

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 Post subject: Re: Anyone here has a 2N301/2N2869 PNP transistor for sale?
PostPosted: Aug Thu 15, 2019 2:21 pm 
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Joined: Sep Tue 30, 2014 6:08 am
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Another suggestion: Post a WTB ad in the classifieds. More folks will see it.

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"Capacitor Cosmetologist since 1979"
USN Retired 1984-2006 (Avionics/Cal)


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 Post subject: Re: Anyone here has a 2N301/2N2869 PNP transistor for sale?
PostPosted: Aug Thu 15, 2019 4:44 pm 
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Joined: Jan Tue 16, 2007 7:02 am
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Location: Lexington, KY USA
It's possible to use silicon transistors as replacements. Something like an MJ2955.

Both Q4 and Q5 should be replaced with the Si parts. R29 at 500 ohms is a large enough value that the driver (Q3) can easily provide the extra Vbe.

With some re-wiring, NPN transistors can be used also.

These power supplies are prone to blowing transistors.

The factory suggested adding a zener and capacitor across Q4 and Q5.

Ted


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 Post subject: Re: Anyone here has a 2N301/2N2869 PNP transistor for sale?
PostPosted: Aug Thu 15, 2019 8:46 pm 
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Joined: Oct Fri 12, 2018 11:07 am
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Location: FL
Usually Lurking wrote:
It's possible to use silicon transistors as replacements. Something like an MJ2955.

Both Q4 and Q5 should be replaced with the Si parts. R29 at 500 ohms is a large enough value that the driver (Q3) can easily provide the extra Vbe.

With some re-wiring, NPN transistors can be used also.

These power supplies are prone to blowing transistors.

The factory suggested adding a zener and capacitor across Q4 and Q5.

Ted


Hello Ted,

Thanks for the reply. I guess I'll definitely have to go Silicon at some point if the rest of the power supply is in good condition and the transistor blows up in future. But currently I'm trying to see if there is any chance if someone might have that Ge transistor in their possession. Right now one of our community members have contacted me with a similar replacement transistor but its almost like an equivalent. The offered transistor is a Motorola SP1484 (NTE Equivalent NTE121). The original 2N2869 is a NTE104 equivalent. I've attached the data sheets for both below. Please take a look at the both and let me know if the Motorola SP1484 is a good substitute.

Motorola SP1484
http://www.weisd.com/store2/NTE121.pdf

2N2869
http://www.weisd.com/store2/NTE104.pdf

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 Post subject: Re: Anyone here has a 2N301/2N2869 PNP transistor for sale?
PostPosted: Aug Fri 16, 2019 1:31 am 
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