Modus Operandi Boost (in a 1590B)

DAJE

Well-known member
Build Rating
5.00 star(s)
A lot of folks here rave about this one, so I added it to an order.

I'd call it a dirty boost / mild overdrive. I can hear why it's popular; it really sounds like you're overdriving a valve amp, even through a tiny solid state tabletop amp.

I used one of the SMD 2222As I got recently, soldered to an adaptor board. The first two pics show that. I used sockets for both transistors, so I could try different ones. I tried a through-hole 2N2222A for comparison and it was pretty close, but I liked the SMD one better; higher gain for a smidgen more bite.

Since the PCB is small and there's only one knob, I decided to use one of the 1590Bs I've had sitting around for years. All hand drilled, no issues other than I hate drilling.

AliExpress sticker as usual for me, I'm really pleased with how this one turned out. Big brown chickenhead knob and a 3mm yellow LED with a 13K CLR because I wanted to keep it mellow. And yellow. Quite rightly.
 

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