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Update (not so updating): I tried 3 different 6111 (different batches) and the result is quite the same.
If I take the signal at TP1 (using a 10uF capacitor) and set the plate at 15v the sound is a lot better, but at TP2 it become dark and low again, even with higher plate voltage.

My suggestion is whatever effect keeping only one knob and all other controls fixed or with trimmers.
Maybe a RAT with gain and filter at 100% and only the output outside. For some heavy drones.

Very nice. I like how it sound with bass.
Beautiful the graphic and the knobs of different sizes.

the beta preamp is one of my favorite.
Nice job.

You found the problem.
330k are too large.
In my naughty fish I used 1k2 for R16 and I think is a value near the limit here.

I made only one pedal with white graphic on black background, and it was hard.
I first painted the enclosure with white, then covered the "graphic" part and painted the black. then printed on adhesive clear paper.


It is the cheaper method, I think.

Hi all,
I have a Mackie 402-VLZ3 since about 10 years.
It's a nice toy, I use it with computer out, in, instruments and other stuff that make noise.
Mic channels also have the instrument switch, a buffer that allow me to play with my passive bass directly into the mixer.
The switch stopped to work, when I activate it no sound come out.

the buffers are the 2 opamps of a TL072.
this is the schematic (I attached the complete pdf file):

I measured the voltages:
1. -15.04
2. -15.04
3. -1.87
4. -16.30
5. -1.87
6. -14.96
7. -14.96
8. 16.05

I also tried to probe the output of the opamps and are both mute.
Maybe the tl02 died?

Thanks a lot.

PS. I don't know if this is the correct section, but this is not DIY, so...
PPS. Sorry for bad english. Any errors are google translate's fault 

I have a room that should be a guest room, but... there's no space for guests 

Inside there are music stuff, bike parts, all kind of tools...
My girlfriend says that I took over all the space, but there are also her clothes waiting to be ironed.

This is my desk. A friend of mine defined it the "MacGyver's desk" 

Ok, today I got 20 6111. At least one should work! 

I've made it in two different ways.
The simplest is to put a 1MC pot in series with C4. so you can go up with the gain, but this influences that new pot, and you have to set both every time.
Also this is not the best sounding solution.

The other way, gnarlier, but better sounding, is to duplicate the input section. In this way you can handle the gain and the sensitivity of the envelope.
This is my building.





I placed the twin input circuit near the UP/DW switch, the peak pot is a 250k trimmer.
Ah, R16 is 1k5 to have a slower attack.
The result is:
https://www.youtube.com/watch?v=rMR5fV72qAE

I tried to socket the cathode resistors. It didn't work.
With both 1k the sound is too distorted, but still with low output.
The tube is to blame.
I have another 6021, but is the same batch. I'll try next days.

I'm thinking to change the two cathode resistors, maybe trying 1k.

Hi,
I just made a uber tuber.
The tube is a 6021 from smallbear. Every value as from the BOM, but C4 is 10n on socket.
I set the trimmers to have about 11,5V on each plate (drive knob at 0%).
The sound is very dark, SAT and CUT doesn't do anything.
I probed it. On pin 1 of CUT knob (all the way up) the sound is brighter.
I don't have tool to measure except my multimeter and my ears.
What can I do?
Here two photos of my building:



Thanks!

I think that new and overdrive are two words that can't be in the same sentence 

what about the sunn concert bass preamp?
Or a low voltage adaption of the sunn 2000s preamp.

A nice thing for overdrive (especially for bass) is to add a cap in series with the clipping section.
This is an example.

Hi all,
I'm Ennio from Italy. I play the bass (the instrument, not the fish) and I like sports (swim, MTB, archery).
I registered in 2012, but I realized only today that this section exists! 
I started making pedals in 2010, and then I started studying the basics of electronic.
Today I'm still studying same things   

I'm not good in presentation, so I let my buildings speak for me.
My last is a Celeste Chorus
I would have liked to have a fender paisley, but I'll settle for the pedal...

This is my youtube channel.

PS.My english teacher was more interested in food than in teaching, so... forgive my bad english.