Help identifying a transistor...

[ttt23]

4G87
N715
EBC


Trying to find a suitable replacement for this part. Any help appreciated! Thank you

[patrick398]

Could it be 2N715?
https://alltransistors.com/transistor.php?transistor=6187

[ttt23]

So the transistor is a PNP with hFE of 225. It's from an old homebrew fuzz pedal. Any suggestions for a replacement?

[antonis]

BC556B/557B/560B flipped 180⁰..
(also BC558B/559B in case of actual working V_CE is marginally up to -30V - 2N715 V_CEO is rated up to -35V..)

Don't know bias/working circuit h_FE dependence, so you might get more than one to choose appropriate h_FE ( B h_FE classification = 200 - 450 )

[bushidov]

A 2N3906 has that same pinout and ones I typically have are around the 200 h_FE mark.

[antonis]

A 2N3906 has that same pinout and ones I typically have are around the 200 h_FE mark.

Are you sure for working current of circuit 2N715 is placed..??

BCs exhibit an almost zero slope h_FE curve up to 60mA Collector current whereas 2N3906 are simply unpredictable..

P.S.
h_FE of particular BJT is totally useless without measurement parameters clearly stated.. 

[ttt23]

Transistor in question has hFE of 225 tested at 10uA base current and Vce2.8V

A 2N3906 has that same pinout and ones I typically have are around the 200 h_FE mark.

Are you sure for working current of circuit 2N715 is placed..??

BCs exhibit an almost zero slope h_FE curve up to 60mA Collector current whereas 2N3906 are simply unpredictable..

P.S.
h_FE of particular BJT is totally useless without measurement parameters clearly stated.. 

[antonis]

Transistor in question has hFE of 225 tested at 10uA base current and Vce2.8V

If so, why you don't search for a p-n-p of E-B-C pinout, tested at 10μA Base current and V_CE 2.8V..??

Even if WE did particular measurement for your sake, results would refer on OUR particular item..
(possibly been far away from YOUR one..)

That why I told you above to get more than one item of the B classification..

[mozz]

Doubt very much it's a 2n715. Will look up the number when I get home from work.

[duck_arse]

Doubt very much it's a 2n715. Will look up the number when I get home from work.

I agree. and I think the first line reads 4687 .... and that it's a house number. our house number is 6, so it's not from round here.

the number 2N2221 came up in cross reference, but that was a few days ago, and I've forgotten what number I was searching.

[antonis]

Now realized it's n-p-n, in case of indeed is 2N715..

Any idea for what circuit is placed..??

[ttt23]

I was given this pedal from a music shop going out of business sale 20 years ago. It's labeled as a scrap germanium drive. I've always liked it and am trying to clone it. Here are pictures from board above and below.  input-> Drive pot-> orange wires. Transistor (and pins) in question are circled. Images are mirrored to try and make sense of the mess of solder below...And I have no clue what I'm doing really, ha - learning through this project!

[anotherjim]

46 (week) 87 (year) could be a date code?

[ElectricDruid]

I'd have guessed 2SC4687, but the pin-out definitely doesn't fit:

https://datasheetspdf.com/pdf-file/640328/SavantIC/2SC4687/1

...so...sorry, I don't know.

[Rob Strand]

46 (week) 87 (year) could be a date code?

Seem like that to me.

The N715 could be an OEM part number.

There's a small chance 715 is a process number,  Fairchild or National Semiconductors.   There was a National Semiconductor discrete databook in the web with process numbers in it.   There's no logos on the part so I've got my doubts.

[mozz]

Can't find it in any of my cross ref books. As was said, house number, you may never know.

[ttt23]

Thanks for looking!

Can't find it in any of my cross ref books. As was said, house number, you may never know.

[duck_arse]

there is no visible germanium devices on that board, either. not unless they are vrrr special types.

[digi2t]

Doubt very much it's a 2n715. Will look up the number when I get home from work.

I agree. and I think the first line reads 4687 .... and that it's a house number. our house number is 6, so it's not from round here.

We're 2632. Might be from up the road.

[Rob Strand]

We're 2632. Might be from up the road.

I think it's the address for Stark Enterprises, they know a lot about transistors.