AMZ FX ANALOG ALCHEMY GEOFX MEF ROG MEF DIY WIKI

2 X 12AX7 Tube pedal

Started by zeta55, May 11, 2009, 04:00:51 AM

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tranceracer

#20
May 12, 2009, 01:49:40 PM
Sweet build!

Looks like a high voltage pedal.  How many volts to the tubes?  Just curious.

Oh Yea, Sound samples if you have the time!   ;)

frequencycentral

#21
May 12, 2009, 02:09:27 PM
That is one great looking build! We are all dying to see schemos and hear clips!

Quote from: zeta55 on May 12, 2009, 02:56:18 AM
........though the inductor itself does not get that warm.

So you used a SMPS? Which one? Voltage? How do you rate it?

Congrats again on a great build.

Rick
http://www.frequencycentral.co.uk/

Questo è il fiore del partigiano morto per la libertà!

Ice-9

#22
May 12, 2009, 02:36:44 PM
Congrats, great looking pedal.
Would be very interested in some schematics and sound clips. :icon_biggrin:
www.stanleyfx.co.uk

Sanity: doing the same thing over and over again and expecting the same result. Mick Taylor

Please at least have 1 forum post before sending me a PM demanding something.

zeta55

#23
May 12, 2009, 04:29:32 PM
Quote from: MikeH on May 12, 2009, 01:03:03 PM
Do I see a couple of Germs in there?
No germs in there, those metalcans are silicon high speed switching trannies for the high voltage for the tubes. Take a look at JJS great projects at http://www.jjs.at/electronic/index.html , my circuit does the same thing, just another approach.

Quote from: tranceracer on May 12, 2009, 01:49:40 PM
Sweet build!

Looks like a high voltage pedal.  How many volts to the tubes?  Just curious.

Oh Yea, Sound samples if you have the time!   ;)

The tubes have about 230VDC before the anode resistor, schematic for the tubes part is based upon this one http://www.schematicheaven.com/effects/mesaboogie_v1-bottlerocket.pdf

I'll try to find some time for a soundclip soon.

/Krister

Visit my site: http://www.zeta-sound.se/

sean k

#24
May 12, 2009, 05:32:32 PM
I've just decided to break up my tube reverb box and power the tank with opamps which means I have two RCA 12SL7 tubes with a power supply ready to do something like yours. 12SL7's or 6SL7's are somewhere between a 12AT7 and a 12AX7 in current draw but they seem to be fatter somehow. Maybe it's the octal sizing which gives the electrons more room to get lost in  ???
Monkey see, monkey do.
Http://artyone.bolgtown.co.nz/

zeta55

#25
May 13, 2009, 03:01:06 AM
Visit my site: http://www.zeta-sound.se/

kristoffereide

#26
May 13, 2009, 03:17:40 AM
I'm not much of a circuit-guy, as the years have passed since school. Is anyone going to try and make a pedal-circuit off of the links above? Or can Zeta perhaps post his own :-* ?
Quote from: biggy boy on April 12, 2009, 06:22:33 PM
I find it funny how I can have close to 1000 components, yet I never seem to have enough parts to make a project. :icon_eek:

newfish

#27
May 13, 2009, 06:49:33 AM
Wow!  That sounds great!

Bastille Day, n'est pas?
Happiness is a warm etchant bath.

Ripthorn

#28
May 13, 2009, 09:24:53 AM
That is a great sounding pedal.  What was the signal path on that thing?  I had plans to do a bottle rocket type thing with 5751's, but after hearing that, I might just have to drop the cash for the 12ax7's.  I would be interested in seeing the schematic or a list of mods from the bottle rocket circuit.
Exact science is not an exact science - Nikola Tesla in The Prestige
https://scientificguitarist.wixsite.com/home

enquiryband

#29
May 13, 2009, 09:54:08 AM
are we going to be left high and dry on a schematic?
yes, that was a radiohead reference...
The mark of an educated man; to entertain a thought without accepting it. Aristotle

lunchie

#30
May 13, 2009, 12:26:51 PM
great work and great sound! It looks like there is again something to build  :icon_wink:

zeta55

#31
May 13, 2009, 01:06:23 PM
How about I post schematic and layout for the tubeboard if you'd like.
Feels a bit strange since I feel I'd like to tune it a bit more.

My power supply though is private.

/Krister
Visit my site: http://www.zeta-sound.se/

Ripthorn

#32
May 13, 2009, 01:16:38 PM
I'm perfectly okay with no power supply schem, the actual audio circuit is what interests me the most.
Exact science is not an exact science - Nikola Tesla in The Prestige
https://scientificguitarist.wixsite.com/home

frequencycentral

#33
May 13, 2009, 01:16:58 PM Last Edit: May 13, 2009, 01:18:30 PM by frequencycentral
Quote from: zeta55 on May 13, 2009, 01:06:23 PM
My power supply though is private.

That's the part I'm most interested in. :'(
But, hey it's yours so up to you. Maybe I should stop sharing........  :icon_lol:
http://www.frequencycentral.co.uk/

Questo è il fiore del partigiano morto per la libertà!

modsquad

#34
May 13, 2009, 02:39:48 PM
Why would the power supply schematic be "classified" anyway.
"Chuck Norris sleeps with a night light, not because he is afraid of the dark but because the dark is afraid of him"

tranceracer

#35
May 13, 2009, 03:37:31 PM
Zetta, great job and thanks for sharing and for posting those nice clips!  Pedal sounds pretty good!

Quote from: frequencycentral on May 13, 2009, 01:16:58 PM
Quote from: zeta55 on May 13, 2009, 01:06:23 PM
My power supply though is private.

That's the part I'm most interested in. :'(
But, hey it's yours so up to you. Maybe I should stop sharing........  :icon_lol:

Looking at the schematic (http://www.schematicheaven.com/effects/mesaboogie_v1-bottlerocket.pdf) looks like the old tried and true reversed transformer trick (insert Maxwell Smart voice over here).  Zetta probably did some cool modifications to "customize" the tone  or...  reduced the PS to push 240V down to the size of a dime which I don't blame him for keeping it under wraps!   :D  ;)

kristoffereide

#36
May 13, 2009, 03:43:07 PM
I can just say right away that we in Scandinavia ( and europe as a whole) has 240V in the wallsocket... Zeta is from Sweden, glorious Sweden.. (btw I'm from Norway)
Quote from: biggy boy on April 12, 2009, 06:22:33 PM
I find it funny how I can have close to 1000 components, yet I never seem to have enough parts to make a project. :icon_eek:

tranceracer

#37
May 13, 2009, 03:44:53 PM Last Edit: May 13, 2009, 03:49:03 PM by tranceracer
Quote from: kristoffereide on May 13, 2009, 03:43:07 PM
I can just say right away that we in Scandinavia ( and europe as a whole) has 240V in the wallsocket... Zeta is from Sweden, glorious Sweden.. (btw I'm from Norway)

Ahh, maybe he had to modify it form 120V to 240V outlets.

solderman

#38
May 13, 2009, 03:45:14 PM
Quote from: zeta55 on May 13, 2009, 03:01:06 AM
Ok, soundclips.

http://www.zeta-sound.se/LadyEvil/Hi_gain.mp3
http://www.zeta-sound.se/LadyEvil/Lo_gain.mp3

/Krister
Grate sound but not very much differens between Hi and Lo gain??
What did you use besides the pedal??

//Solderman
The only bad sounding stomp box is an unbuilt stomp box. ;-)
//Take Care and build with passion

www.soldersound.com
xSolderman@soldersound.com (exlude x to mail)

solderman

#39
May 13, 2009, 03:58:39 PM
Quote from: tranceracer on May 13, 2009, 03:44:53 PM
Quote from: zeta55 on May 12, 2009, 04:29:32 PM
Take a look at JJS great projects at http://www.jjs.at/electronic/index.html , my circuit does the same thing, just another approach.

Yea, I have this project bookmarked too!  Looks like a sweet project, been wanting to build this for over a year, just no time w/ my work schedule.  (look how long it took me just to get sound samples of my 6418 dual tube pre. :icon_redface: uhhh! 

I'm glad you were able to get it completed at least I know that one other person can verify that it works!
Yes, rellay nice site and those amp are awesome.
Tip for those who want to boost the voltage for tub projects. The power supply is what is known as "Nixie power supply" comes from the Nixie tubes those tubes with digits in them. This is a more easy controlled one since it does not rely on zener diodes to controll the voltage. I have used it and it works grate. I did not need a fan for cooling the inductor coil at 185V.

http://www.ledsales.com.au/kits/nixie_supply.pdf

Think Rick H used it in som of his builds as well.
//Solderman 
The only bad sounding stomp box is an unbuilt stomp box. ;-)
//Take Care and build with passion

www.soldersound.com
xSolderman@soldersound.com (exlude x to mail)
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