Coron_Distortion_III.jpg Hi!

I have this Coron Distortion III which I got in an auction lot with a few other pedals.

Since I haven't seen a schematic for this online, and I wanted to practice doing a trace, I thought I'd give it a go.

I've added my trace files in case you can spot any mistakes.

Furthermore, I haven't been able to identify Q5, but my guess is that it could be a j-fet. It's marked 304 F1L and comes in a TO-92 case. The middle pin goes to ground and the other two measures...

I need to replace the potentiometer on a Ross Phase R1 (Purple).
The potentiometer is utterly destroyed.
There is absolutely no resistance reading between the outer pins and the CTS potentiometer is not marked for value.

It seems someone put brakefluid in the potentiometer which in turn ate up the carbon track completely.

If someone has a purple Ross Phase R1, I would really appreciate it if you could
1) just measure the resistance between the outer potentiometer pins for the two cases of...

Hello guys.

I'm one of those guitarists who does not live without volume and tone controls, I am used to set my amp with more highs and cut this excess in the tone control, when I want my guitar more expressive I turn the tone a little way up as a result it works as a second volume control that avoids gain losses.

Strat control tone works ok, but they are effective after 5 and its a little aggressive at the begnining (3 to 0), this circuit I have implement in one of my strats in the bridge...

In patent 4627094 of December 2, 1986, Tom Scholz described a guitar compressor.

He also highlighted an issue with the release times of the compressor.

Tom described the ADSR curve of a guitar signal as follows:

On a guitar, the first sound or pulse that comes out can be a huge peak which is almost always much stronger than the signal that follows after a few milliseconds.

Then he described the problem with his earlier versions of the compressor:

The operation has not been found to be...

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hallifax treble booster guts .jpeg

So I’m having a weird issue. I’ve used regulators countless times over the year to drop voltages to where I need them to be.

For a few years I’ve been using an 18v regulator with a 24v 4A power supply. Works beautifully. However, if I try to add a 9v regulator, the regulator over heats or goes up in smoke while the 18v regulator continues to remain stable and cool. Any ideas what could be happening here?

I've been on a bit of a delay kick (see EchoWreck and T60) and thought why not try a double tracker? However, one reason there are so few of them out there is that the PT2399 doesn't do short enough delay times for a lot of double tracking. It's got a 29 ms or so minimum time. I was repairing a CE-5(t) that uses the ES56028 and found it had very low delay times, but it's a 40 pin chip. Turns out there is a 16 pin ES56033. I bought five on Aliexpress to try out and the Stalker came out of it....

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Thought you all might enjoy this one.
The slightly earlier version of this pedal is essentially a 9v germanium FZ-1 with controls to boost the highs or lows. This version has three 2N 5172 transistors and works in the same way, but sounds quite a bit more aggressive. Not sure if this circuit is reminiscent of anything else?
The FD-3A version seems to have been made in 1967 and 1968, and this version from what I...

I haven't seen this one here already, so I gave it a trace both for personal fun and curiosity:

bassmuff.png

Some values aren't there because they weren't marked on the silkscreen like the others, and I'm not going to pull them out to check. You get the gist of it though: they basically doubled up most caps with another one in parallel. The tone stack is a flatter variant. The bass boost literally mixes some lowpassed signal with the tone stack output. The parallel dry blend is done in a...

I am rehousing a Danelectro french toast fuzz (Foxx TM) and added an led via switching ground off terminal 13 of the 4013 chip, works fine except the LED is flipped, when I turn off the effect the LED comes on. I suspect this comes down to the switch I used:

While I've used this switch in the past on other relay-based pedals, this one is obviously not working. On another Denelectro rehouse I did I used this switch:

That one worked fine but the circuit already had an LED built in. I'm...

Hey guys,

I didn't see the newer Big Muff schematics up anywhere, so I traced mine while I had it apart. I bought it sometime in 2014, PCB reads EC-3003 REV_E. Ref Des on the schematic should match the PCB. Level pot may be wrong (Silk says 500kA) as I replaced the pots almost immediately after getting it because one of the awful, awful ones that came stock broke.

Hopefully this will help people looking to mod theirs.

Joe

Compressor before Distortion vs Piecewise function generator before Distortion

In some patents, Tom Scholz extols the virtues of compression before distortion

In fact, almost every SRD product that has distortion stage has also a compressor before it

The compressor evens out the initial high energy attack and effectively boosts the sustain at the end of a note, feeding the distortion stage with a more even signal from start to finish than if it was fed directly with a guitar. This makes the...

Moen Jimi Nova vibe, excellent sounding easyvibe.

Hello
my Quad Preamp has suffered from being stored during near a decade... yes it's a shame :roll:
So of course I will have to change the electrolytics, all the orange drop capacitors which are on the anodes, and of course... the vactrols ...
Some of them have died at power-on, when I tried to use the preamp after its long sleep in the closet.

Of course, I plan to roll my own 19 vactrols, seeing that the most important specs to target seems to be the R off which should be greater that 50Mohm...

Hi!

My Zonk Machine started oscillating/squealing and producing static noise when attacking the strings. I didn't use the pedal for a while and wanted to put it on my board again.

The squealing is even heard when the pedal is off. The battery is new and works fine in other Tone Bender style pedals.

I made a short video of the issue:

Any ideas what could be causing this issue and how to fix it?

Thanks!

Strymon - Timeline, Mobius, BlueSky guts