Substitute for AC126 transistor for a Treble Booster and Tremolo circuit

[Rambozo96]

Seems like an oddball number. I'm really wondering what would work on the Tremolo side as I subbed the AC126's in the treble booster with old Phillips ACY21 and 2N1309. Thanks in advance!

[BetterOffShred]

As with nearly every other effect circuit using Ge transistors.. I'm willing to bet this effect relies more on a specific gain range and leakage spec, rather than the actual callout on the PNP there. 

This circuit looks fun  I'd love to build it. 

I'd try some cheap PNP Russians in the 100hfe range.  I don't know enough about circuit theory to tell you what's happening there. 

[duck_arse]

the oscillator is a 4-cap phase shift oscillator, you probably want best gain here. subbing a sillicon would need a few resistor values shuffled, or you could just lift the osc from the family of EA trem's. the other three Q's would be non-critical, I think. that switch arrangement is a mystery, glad I'm not wiring it.

[Rambozo96]

The 3 switches on top appear to be 3PDT's. There's a DPDT to bypass it. The "Arrèt" switch seems to be a battery cutoff switch which will be omitted and a stereo jack will take its place for that application.

[ElectricDruid]

Is that pedal running on 2 x 9V batteries? I see +9V and -9V as well as ground.

[duck_arse]

well, those switches - they appear to be drawn up/down, so the first is the power switch, makes sense to either omit, use a single pole or switch with the jack. the other two show only two poles in use [up = off] if they are 3pdt. would make sense to use dpdt, or use the third pole as a led indicator switch.

ED - I think the + reference is the battery connection, grounds it when "on". this all depends on whether I've translated the switch at all correctly.

[Rambozo96]

I am positive (no pun) that the "9+" in the schematic is the ground. The Arrét or "stop" switch looks like a battery cut off switch to me like on the old Fuzzrite.