Doug Hammond’s Meteor

[Kroars]

Not sure if this has been suggested. I haven’t found much online in the way of demos, but it seems to have been all the rage in certain diy circles back in the day. Maybe the circuit has been cloned by someone else? Either way, thought I’d put it up. It appears to be a five knob OD circuit inspired by Ken Fisher’s TW Express

Wayback Machine

 

[Bucksears]

LOL - I've got that printed out and in my 'effects 3-ring binder' from way back then (1997 --> forward).
Like you said, not much in the way of demos on that one; not sure if that was verified or what. First thing I'd do with that is replace all of those resistors on the JFET Drains with 50K (or 100K) trimpots.

Only TWE circuit I've worked on is PPCB's Derailer (Ethos TWE-1 clone).

 

[temol]

I can't confirm that it sounds like Trainwreck but there is definitely a lot of gain. It's on my breadboard now, maybe I'll post a sample.
A lot of gain + breadboard can be a bad combination and here I can hear that there is a some instabillity. Perhaps there is even some oscillation, but at such a high frequency that it is not obvious.
Tone stack right after the first stage is a so-so solution (in the case of transistors). Right at the beginning, the signal is attenuated and then amplified - a higher noise level can be expected than in the case of tone stack at the end. I also have doubts about such large source bypass capacitors.
Here's Ltspice simulation screen to illustrate the tone stack impact on the signal level.
Red - input
Green - after Q1
Blue - after Gain pot
Cyan - after Q2

 

[Kroars]

I can't confirm that it sounds like Trainwreck but there is definitely a lot of gain. It's on my breadboard now, maybe I'll post a sample.
A lot of gain + breadboard can be a bad combination and here I can hear that there is a some instabillity. Perhaps there is even some oscillation, but at such a high frequency that it is not obvious.
Tone stack right after the first stage is a so-so solution (in the case of transistors). Right at the beginning, the signal is attenuated and then amplified - a higher noise level can be expected than in the case of tone stack at the end. I also have doubts about such large source bypass capacitors.
Here's Ltspice simulation screen to illustrate the tone stack impact on the signal level.
Red - input
Green - after Q1
Blue - after Gain pot
Cyan - after Q2

View attachment 61571

Right on, thank you!!

 

[temol]

Here it is. Gain settings - (hours) 9, 11, 13, 15, max.
Tre - 15, mid, 15, bass 9.
Guitar -> breadboard -> audio interface, 4x12 V30 Mesa cab impulse response.

meteor.wav

Shared with Dropbox

www.dropbox.com

 

[Kroars]

Man, thank you for taking the time to upload that! I really appreciate it!!

 

[Fama]

Here it is. Gain settings - (hours) 9, 11, 13, 15, max.
Tre - 15, mid, 15, bass 9.
Guitar -> breadboard -> audio interface, 4x12 V30 Mesa cab impulse response.

meteor.wav

Shared with Dropbox

www.dropbox.com

That sure is a lot of gain! I like the "it's an amp but with JFET's" style stuff a lot, so I might build this one if it was available.

 

[Feral Feline]

This would be a cool one to have in the DIY pedal stable.

Here's JC Maillet's mods:



Best resolution I have, unfortunately.

 

[temol]

Even more gain.



And another comparison: 220u C6 ON (red) and OFF (green).