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Hi,

Would someone please post the voltages for the 12ax7 pins 1, 3 and 6 when the bias pot is full CW?

Much appreciated

Add a Fat Switch by placing a cap in parallel with C5 (10nf) via a toggle switch

Between 2.2nf and 10nf to taste.

Or just increase the value of C5 for a little more oomph.

So while reading through the build doc for the Archibald, I remembered I had a Craig Anderton Stack in a Box PCB from way back in the day, which for whatever reason ended up in the "some day I'll have to modify this" box.

Thanks to madbean, 25 years later and that day has finally arrived 

I successfully stripped down and repurposed the circa '93 pcb.  Luckily, only damaged/repaired a couple solder pads and was able to juggle things around to keep all but 1 component onboard.

The original SIAB 42v tube plate voltage supply was accomplished with a 12v AC supply and a CD4049 used as a tripling "charge pump". Using the same 25 year old Radio Shack 6-0-6 450ma transformer and increasing the filtering, I was able to get +48v out of the 4049.

Built the Archibald with the EQ, Bias, and Output buffer only I used the available opamp as the buffer rather than adding the jfet.
I also converted the tube portion of the circuit for use with the +48v DC supply, rather than the Archibald's dual +/- supply. I do have the +/- 15v supply for the opamps though.

Didn't get play it very long, but sounded promising. 

I'm restoring an old Webcor power amp for a guy who wants to use it as a guitar amp. Hoping this will pair up nicely as a preamp for it.






 

Would anybody have the Harbinger Two pcb deminsions handy?

Fired right up, thanks again Madbean!

This pedal is alot of fun, with alot of cool sounds, although took a bit of practice to get it figured out.

Goes from volume swells, to violin like, to long drones, to reverse-tape like...and probably more.

As for the build, moved the controls around to better suit the graphic.

Added an optical bypass too for silent switching.

How would I increase the level of the ghost notes?

Increase R14?
Decrease R14?
Decrease R15?

The pcb is already populated with the stock values, dont want to risk buggering it up by tweaking resistors if not going to help.

Thx

I'm getting a noticeable pop the 1st couple uses of the Vintage/Modern switch. Same pop regardless of the starting position of the switch.

I had also been getting a pop with the Chorus/Vibrato switch, but adding a 10u cap between Volume pot lug 2 and the output seems to have solved that one.

I also added a 1M pulldown resistor at the input right on the stomp switch.

The stomp switch and Chorus/Vibrato switches are quiet. The vintage/modern is still popping.

Looks like skeeter had this same pop http://www.madbeanpedals.com/forum/index.php?topic=21836.15

Does anyone know the solution?

I was getting distortion on the repeats, but not where expected.

With my audio probe, PT2399 pins 15 and 14 sounded fine. Pin 3 on IC4 was good, but pin 1 had some distortion, then pin 7 on IC4 had even more, or was at least louder.  I swapped ICs, no change.

R23 and R24 were correct values and soldered well.   

I removed the gain through IC4a by pulling R24 and replacing R23 with a jumper. Seems like the distortion issue is resolved.  T1 still allowed enough volume compensation for the repeats given the reduced gain through IC4a. (Thanks Madbean!)

Question is, what effect does reducing the gain of IC4a and the removal of C23 have on the sound?  It may have sounded a bit darker, but I couldn't really be sure without having a side by side comparison.

Maybe a better question is what is the function of C23?

As I'm writing this, I'm also wondering if C23 was the culprit all along. I don't want to risk buggering up the board by pulling any more resistors or capacitors, I'll wait for some feedback before continuing.

Since I removed the gain, maybe I need to tinker with the value of C22 too?   

Thanks,
Mike

I found this info posted on tagboards:

Sean Caskey25 March 2016 at 12:10
Found this info: Delay times for pt2399

with pin 6 grounded,
5V supply = 24ms
6V = 18ms
6.5V = 16.5ms
7V = 15ms
7.5V = 14ms
8.5V = dead chip

I went ahead and tried 5.7v, 6 and 6.7v.

Seems like the chorus progressively tightened up but also got a bit darker and less lush. It seems like the depth is backed off somewhat with the higher voltages.

5.7v was still pretty good as is, but I think there may be some tweaking needed for the higher voltages.

Would lowering R18 add back some depth? And hopefully some brightness?

What about C18, does that somehow affect the tone?

Guess I'll try them tonight and find out.

Does anybody have the voltage readings for the transistors handy?

I was getting good volume boost but a lot of white noise with the gain turned up, the audioprobe found the noise started at the drain of Q3. So I swapped it out and now I'm barely getting unity gain with everything maxed out.

I'm going to get together a few more 2n5457s (smd-to-adapter board) but was hoping in the meantime to get the transistor readings from a working build.

Thanks!

What would be the proper way to slightly increase the maximum feedback?

Would it be reducing R7s value? Currently 8k2.

http://www.davidrolo.com/effects/liquid-mercury-tap-tempo-phaser/

Finished up a Harbinger One, seems to be working correctly but I'm only getting about unity gain with volume maxed and the overall sound is less than lush. Also, the vibrato is almost un-noticible at slower speeds, sounds ok at fast speeds though.   

I used the recommended lamp and photocells per the 2015 doc, with a 3/4 inch copper cap as the shield, tried with and without being lined with aluminum foil. Lined sounds better. The photocells are flat against the board.

Cant seem to bias in an even warble or one that satisfies, although there appears to be a lot of room to adjust both gain and offset. The lamp can get very bright with gain adjustment. (much brighter than the smaller of the two recommended lamps) The offset can adjust the lamp to turn out or stay dimly lit as it fades out.

The only intended change to the circuit is a dual 100k audio pot, instead of the dual 100kc, which I wired in reverse by flipping both lugs 1 and 3 making it a "slow" pot rather than "speed" pot. All other part values are stock.

Powered with 9V and LT1054.

The flasher LED (diffused RED 3mm) does not light up on slower speeds, wondering if that is normal operation or possibly related to the less than spectacular sound and volume.

Transistor Voltages: (all stock parts)

Q1
1.03
1.45
1.85

Q2
1.56
1.8
4.4

Q3
3.8
4.4
13.6

Q4
5.1
5.5
17.5

Q5
4.5
5.13
13.05

Q6
17.53
5.25
4.7

Q7
4
4.7
4

Q8
5.13
5.53
17.54

Q9
4.5
5.13
13.06

Q10
6.4
6.9
17.5

Q11
7.4-9.5
6.4-8.9
15.18

Q12
6.6 - 8.9
7.0-9.5
15.18

Q13
3.8-4.9
0
10-11.5

Q14
17.54
.47
0

Q15
15.18
15-15.3
0

   

I have a high pitched noise that I can't pin down. The noise enters at the junction of R3 and R5. Quiet between R3 and C2.

Seems to be everywhere along the audio path after R3, it's the exact noise when audio probing 9V or VB line.  IC1 pin 1 is quiet, all other IC pins with audio signal have the noise.

The trimmer changes the pitch of the noise. And the noise phase shifts. The noise is there with the TL062 and LM13700s pulled. The transistors are not socket-ed, not sure what I was thinking there.

Seems like it should be an easy one to fix, but I'm not sure what to check or try next.

Here are the IC voltages.

TL074
1 4.67
2 4.67
3 4.25
4 9.30
5 4.65
6 4.67
7 4.67
8 7.72
9 4.67
10 4.58
11 0
12 4.65
13 4.67
14 4.67

TL062
1 varies
2 varies
3 varies
4 .05
5 4.67
6 4.67
7 varies
8 9.30

All 3 LM13700
1 1.24
2 0.05
3 4.67
4 4.67
5 5.8
6 0
7 5.8
8 4.67
9 4.67
10 5.8
11 9.3
12 5.8
13 4.67
14 4.67
15 0.05
16 1.25

I've been struggling getting repeats to sound good on a couple of Dirtbaby's and a Zero Point Mini. I managed to record a sample from my Zero Point Mini tonight. 

I'm curious if this sounds the same as those of you who are also having noise issues with PT2399 builds.

Mix is on high, Feedback down and Modulation off.

Recording is neck pickup, effect bypassed, then slapback, delay 1/2 up, then almost full, then full delay. 

I have 5 PT2399s from Tayda and 10 from Nooelec. All sound just about the same. I'm still waiting on a couple I just purchased from mklec.

It's got to be the PTs as I have 2 Dirtbaby's and 1 Zero Point mini all having this same noise issue.

I have a clean output, no flange.

Clean audio probe signal on MN3007 pin 3, nothing on 7 or 8.

Some wacky looking voltages, don't know where to begin. Please advise.

I had no issues with the previous version of the Collosalus, but I used an older 4013 I had for years, don't recall the prefix or suffix.  This CD4013BE I purchased from Tayda. I also used JRC4580s on the last build and they sounded great.

I tried BC549 (no suffix) also from Tayda, then BC550c. Voltages below are with the BC550Cs.

I have 1 more MN3007, 4013 and a couple 4049s. Don't want to try them until someone else gets a looks at these voltages.

IC1 NE5532P
1-7.71
2-7.54
3-7.56
4-0.0
5-7.14
6-7.48
7-7.48
8-15.22

IC2 JRC4558
1-7.61
2-7.61
3-7.57
4-0.0
5-7.6
6-7.61
7-7.61
8-15.22

IC3 JRC4580
1-varies
2-7.78-7.82
3-varies
4-0
5-7.87
6-7.87
7-7.87
8-15.2

IC4 JRC4580
1-4.12
2-4.12
3-4.09
4-0
5-7.58
6-7.61
7-7.68
8-15.21

IC5 HCF4049UBE
1-15.2
2-0
3-15.2
4-15.2
5-0
6-0
7-15.2
8-0
9-0
10-15.2
11-0
12-15.2
13-0
14-15.2
15-0
16-0

IC6 CD4013BE
1-0
2-15.2
3-15.2
4-0
5-15.2
6-0
7-0
8-15.2
9-15.2
10-10.19
11-15.2
12-15.2
13-15.2
14-15.2

IC8 LT1054
1-1.33
2-1.66
3-0
4-3mv
5-0
6-2.58
7-1.51
8-9.27 

IC9 MN3007
1-15.2
2-15.2
3-10.29
4-1.52
5-13.95
6-0
7-15.05
8-15.05

Q1 BC550C  C-0.5 B-0.5 E-0
Q2 BC550C  C-10.45 B-0 E-0
Q3 BC550C  C-0 B-0.5 E-0
Q4 BC550C  C-15.2 B-15.06 E-14.51
Q5 2N5087  C-15.2 B-15.2  E-10.49

Can't catch a break, I've been struggling getting the Aquaboy deluxe to sound clean, so I put it aside and built the Dirtbaby. Everything seems to be working but I get a white noise on the repeats.

Audio probe on PT2399 pin 15 signal is clean, but white noise on the delayed signal on pin 14.

Reflowed solder, tried different ICs before I used the audio probe and found the noise is coming out on pin 14.

I must have had beginners luck with delays when I built the Zero Point SDX a few months back, fired right up with no issues. It's been a frustrating week with these other two...

After reading through previous posts and trying many of the "fixes" I still can't get a clean repeat, in fact I can't get it even tolerable. I still have oscillation runaway too when using the Feedback knob, even with T1 all the way down.

Powered by Road Rage 2015, LT1054 and 7815.
Clock set at 7Khz with Delay pot maxed.
D1, D2 & D3 omitted. IN5817 used in place of R58
8k2 - R50 & R51 (VTL5C3)
R55 & R27 jumpered (Could this be related to the distortion issue?)

Currently have 3 unresolved issues:
1. Biasing BBD1 - distortion and high pitched whine
2. Distorted repeat
3. Can't turn feedback pot past noon or oscillation begins.

Biasing per build doc:
With IC4 removed and audio probing IC3 Pin3 I get a loud high pitched whine over the signal unless I turn the clock trimmer way counterclockwise. So when I'm trying to bias BBD1, I can't get rid of the distortion and I get a high pitched whine on top of the guitar signal (with clock set at 6.5Khz) Is that normal?

Here are the "mods" I have in place at the moment:

Compander biasing
(14.6V Pin 13-NE570)
Increased R13 & R14 to 42k. Gives  7.25V on pin 7-NE570
Decreased R37 to 8k2. Gives 7.33V on pins 10,11 - NE570

Loud Repeats:
Increased R38 to 68k to tame the volume of the repeats a bit. 

Other changes:
20k Trimmers for Bias 1 and Bias 2 (Started with 30k)
100K Trimmer for T1 (Started with 50k)

Other "mod" tried:
Lower gain of BBD 2, tried 33k for R28 & R29. This resolved the oscillation issue but not the dirty repeats so I put them back to 100k for now.

Here are my voltages:
    IC1 - LF353                       IC2- NE570                       IC3-MN3008                  IC4-MN3008
1. 0.0         8. 14.6            1. 1.03      16. 1.05            1. 14.11      8. 0.95         1. 14.11    8. 0.95
2. 7.29       7. 7.29            2. 1.84      15. 1.84            2.   7.09      7. 7.94         2. 7.09      7. 7.21
3. 7.29       6. 7.29            3. 1.84      14. 1.84            3.   6.40      6. 7.09         3. 6.73      6. 7.09
4. 0.0         5. 7.29            4. 0.0        13. 14.6            4.   6.38      5. 0.0          4. 6.75       5. 0.0
                                        5. 1.84      12. 1.84
                                        6. 1.84      11. 7.33
                                        7. 7.25      10. 7.33
                                        8. 1.84        9. 1.84

    IC5 - MN3101                    IC6 - TL062
1. 14.11      8. 0.95       1. Varies        8. 14.60
2. 7.09        7. 6.91       2. 7.36          7.  Varies
3. 0.0          6. 7.13       3. Varies        6. Varies
4. 7.09        5. 6.79       4. 0.0            5. Varies

Q1 14.6/6.55/6.24
Q2 14.6/7.19/6.6
Q3 14.6/6.70/6.12
Q4 14.6/6.10/5.52

Last note, I'm playing a Les Paul with Tone Zone pickups.

Please help, thanks!

I built the Road Rage hoping to use my old Motorola 5V power supplies to power some of my effects.

The Motorola adapter is rated 5V, 850ma.

I used the MAX1044CPA and 3 1N4001s for D1-D3 hoping to drop the doubled voltage closer to 9V.

With no load, the Rage puts out 9.5V, but when I power up my Wampler 65 clone, it drops to 8.5v.

Is this normal?