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It would be a 0.47uF electrolytic I'd personally try a 470nF film cap I note the polarity is the reverse of C2 you can test for polarity on a film capacitor like this albeit I've no idea how accurate it is You could also put two 1uf caps in series to give you 0.5uf

Yeah I'm looking at an old Disarray build doc it's the same resistor 1K2 will be fine

Yes you can use a 1K2 for R12 in that circuit 3PDT lugs should be horizontally oriented like @Dan M has it, switched one way middle connects to top for 18v and switched the other way middle to bottom for 9v Just for info the middle row is the common row and it either connects to the top or...

I use a test box with integrated audio probe http://tagboardeffects.blogspot.com/2014/09/test-box-20.html?m=1 you could also use the auditorium test platform https://www.pedalpcb.com/product/pcb365/ With the duocast the left footswitch as you look at the pcb is for high and low gain modes...

The link @fig gave shows centre negative I think maybe everybody means the buyer put a centre positive in? Just check the symbol yours has on it to make sure Although you can't really check diodes in circuit you can still check D9 conducts around 0.6vish if it's silicon or 0.2vish shottky...

They look ok to me R12 and 13 should divide whatever's coming out at D15 cathode in half, then it goes to all your VREF points You can ignore IC3 pins 5, 6 and 7 with them being unconnected I don't know 100% but with C22 inverted pin 4 voltage would be inverted because negative side goes to...

Initially I thought it was maybe a solder bridge causing funky voltages I've had the exact same strange readings on a build Voltages were fine with the IC out of socket and weird in socket it turned out to be a solder bridge which only became active with the IC inserted If you haven't already...

I'd perhaps take voltages again, some are confusing no voltage on either side of D15 for example but voltage beyond it I down loaded the build doc again just to make sure I was on the right revision I did think maybe a different rev hence me asking rather than saying C10 was wrong Post a pic...

Is C10 the wrong way around? looking at the pcb image + should go bottom side

IC3 should double your input voltage Double check what you get on C10 + and at the junction of R12 and 13

Post some nice clear images so that component value and orientation and wiring can be seen and traced Pin 4 as you can see in the schematic power section should be 0v ground You haven't accidentally put the new ICs in upside down? When you say it was working was it in or out of its enclosure...

Sounds like a grounding problem pin 4 on IC1 and 2 should be 0v You've also omitted the reading for IC2 pin 8 Are your pin numbers correct

There's a little bit of info here http://revolutiondeux.blogspot.com/2012/07/fairfield-circuitry-barbershop.html?m=1 Gray bench electronics also does a teardown I haven't watched it so not sure how much detail he goes into he does V1 and 2 https://youtube.com/channel/UCz2RmB7jBh3_TdD3gKjeC-Q

It should test almost anything Google TC1 tester manual there's a calibration procedure in it if you get incorrect readings

Looks like it bypasses D4 for asymmetrical clipping so more or less routes the signal through the path of least resistance either through D4 or not

Very nice Mark what mad name you gonna call this baby?

I built the pcb version using 12AX7s and breadboarded the circuit using 6948s Both oscillated! The first thing I normally suspect is myself until proven otherwise Long story short I went over the circuit with a fine tooth comb nothing affected the oscillation in the power supply, the only...

It'll be fine with a 47K it won't noticeably affect IC1.2

I use it for big pcbs and when debugging big builds with lotsa components Its easy to turn the pcb over when you can't get your probe on a cap etc If I'm honest I don't use it that much initially I did then it sat on a window sill for months It is useful though especially if like me you...

Here's the PDF of Mr Wamplers book if anyone wants it https://drive.google.com/file/d/0B1sj33FDgVfUSDR3NFBwam54Uzg/view?usp=drivesdk&resourcekey=0-nFD36zcTN2O0lQNEXOla1A