Screaming Baby Amplifiers Flower Power Analog Distortion

So it apperars to be a silicon PNP FF with diode clipping at the output. Original is point-to-point, but with this layout you'll fit yours in 1590A with some careful measuring. Although the positive ground may come as a problem with that size...

From FXDB:
'FLOWERPOWER' VINTAGE VOICED ANALOG DISTORTION FUZZ BOX!!! True to vintage design.
Beautiful blooming analog distortion/fuzz with excellent pick articulation and harmonics.
Unlike some distortion boxes that are quieter than your dry signal, when you click this pedal on, you know it! Even at lower gain settings it is louder than your dry signal!
At lower gain you get a full, pretty 60's overdrive, when gain is cranked you will get a heavy fuzz tone that produces wild oscillations and clipping at the tail end of your signal- MASSIVE AMOUNTS OF HARMONICS!
This pedal is voiced with huge low end and full tone and sounds great with a bass as well as guitar!!! Positive ground, true bypass- solid die-cast box with top quality parts -tone capacitor is finest made in France today- dims 2 1/2" H x 4" x 5" approx. Handwired point to point for extreme retention of guitar tone and dynamics.