SOLVED Ungula Cleft Mod - Pinout orientation for MPSA13 transistors?

[Thommysalami50]

I’m building the Ungula (hoof) with the Cleft mod (Cloven hoof). I’m likely over thinking but what is the pinout for the two MPSA13 transistors in Q2, Q3?

Here’s a pic of the board. I’ve checked others builds with the cleft mod and I can’t tell if the E,B,C holes are used, or if it’s E, (bottom middle pin underneath B), and then C?

Ignore my wires in these holes, I was initially going to test without soldering the transistors but I’m ditching that route.

ALSO: I’ve seen in the forum that others have changed out the values of the Potentiometers to better match the cloven hoof: anyone have any details or recommendations?

 

[cliffs_trip]

Pretty sure the extra middle hole is there for cross-compatibility between the different transistor package types. Should be able to use either hole in the middle/bottom for the base.

 

[cdwillis]

I think the last one I build I used the standard linear 100k pots for sustain, tone, and volume, then a linear 25k for the mids pot. I think the EQD called for like a 50k sustain pot (why?) and a 1m volume pot (much larger why??).

MPSA13 is the same pinout as a 2n5088, 2n3904, 2n2222, etc. If you orient the transistor to look like a C (as opposed to a D) it's collector at top, base in the middle, then emitter at the bottom. Turn it 90 degrees clockwise and put it in the holes.

 

[angelrulax]

My recommendation for all is to buy a T7 tester. It's cheap and handy. You can audit transistors for the pinouts for example, check resistors, capacitors and diodes before solder it in the PCB. All of my boards worked flawlessly since I have It.

 

[Thommysalami50]

This is a bit late of a response but @cliffs_trip had it right, that extra hole is for different compatibility. I socketed and tried both holes and it made no difference. This one’s been solved!