Bullitt tremolo component values

[j_flanders]

I'd like to try and build Tone God's Bullitt tremolo but I have a couple of questions:

1) Is this still the last revision of the circuit: http://tech.thetonegod.com/bullitt/bullitt.html

2) Capacitor C10 has no value in the above schematic. Anyone an idea what would be a suitable value in that spot?

3) Wat kind of taper pots should I use.
Gain1    100K
Speed1   50K
Treble1  250K
Bass1    250K
Mid1     10K
Depth1   10K
Level1   50K

4) What kind of tubes are recommended? I see 12A*7, so: AU7, AT7, AX7? Does this only affect the boost/OD part of the pedal (trem depth at 0) Do some of those work/sound better/worse at 12v?

[j_flanders]

Ok, trying to answer my own questions 

1) I'll just assume so...
3) I guess linear for everyting except Log A for treble and bass (classic fender tone stack) and perhaps a normal Log for level/volume
4) I'll go with 12AX7. I guess this only affects the boost/OD part and I can easily swap tubes afterwards if needed

Thats leaves me with the missing value for C10. Can anyone make an educated guess for its value or knows its function in that part of the circuit?

[PRR]

C10 does the same job as C2, so that is not a wrong choice.

By inspection, 0.01uFd would give 20Hz response, far more than you need, and would be a non-polar low-leakage Film cap.

[j_flanders]

Thanks PRR. So, it's a DC-blocking/AC-coupling cap. 10nF seems to give me 15,9Hz.

One last question: is there any logic to the use of those little black squares in the schematic which indicate a (solder)connection?
http://tech.thetonegod.com/bullitt/bullitt.jpg

Usually I see them being used for every connection and only left out when lines cross and should not be connected.
But in this schematic I fail to see the logic since
They are used where 'simple' connections are evident (C1) but also left out when connections are evident (R3).
Which makes me wonder about the connections on the crossing lines. Luckily there are only 3 of those.

Can you confirm my conclusion:
Vb output of U1A should not be connected to R17 (connection left out correctly)
Tone stack C8 should be connected to lug 3 and not to wiper (connection left out incorrectly)

[PRR]

> is there any logic to the use of those little black squares

If there can be ANY confusion, crossover and dots should be applied liberally.

Crossovers are awkward and some think they are ugly. Some do not like dots. Gaps can replace crossovers in simple stuff but may be unclear in complex drawings.

There are Rational Standards which seek to eliminate such fussywork. For more fun, there are multiple traditions and many variations.

The crossover versus 4-way junction is very troublesome. The no-dot/jump can be re-rendered as two non-aligned 3-way junctions, slightly less ambiguous.

My idea is that if the technician "can" be confused, it must be re-drawn (dotted-up).

I agree that this one is non-compliant.

Sometimes you (the tech) just have to use your own brain.

I think you got it sorted. FWIW, here is my interpretation.

https://s29.postimg.org/wtxtlcynr/Bullet_dotty.gif

[j_flanders]

Thanks for the explanation, confirmation and for actually drawing all the missing dots. I'll report back when I have bit the bullitt.   

[PRR]

Electronics All-in-One For Dummies, By Doug Lowe

The lines in all but the simplest of electronics schematic diagrams will at some places need to cross over each other. When they do, it's vital that you can tell whether the lines that cross represent actual connections (also called junctions) between the conductors or the lines cross over each other but don't actually connect.

Unfortunately, there isn't one clear and universally used standard that dictates how to indicate whether crossed lines represent a junction. Instead, there are a number ways for showing crossed wires with or without junctions.


.... more .....

http://www.dummies.com/programming/electronics/electronics-schematics-crossing-your-wires/
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http://electronics.stackexchange.com/questions/28251/rules-and-guidelines-for-drawing-good-schematics

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https://en.wikipedia.org/wiki/Circuit_diagram

(Note: this text says dots came in with "computerized drafting", which is untrue. See this snip from Pop Electronics Dec 1954. Despite foxed pulp-paper and bulk scanning, the dots are clear, as was intended.)