(http://users.bigpond.net.au/styrowfoam/tube.jpg)
Pics:
http://www.diokay.com/images/prod/Tubesd.jpg
http://www.diokay.com/images/prod/Tubesd2.jpg
I found this on the HC effect forum. Real or fake? I mean, it's not like you can just wack a tube in like you can a new opamp. Certainly food for thought though.
reminds me a little of this:
http://www.geofex.com/FX_images/realtube.jpg :wink:
if that is for real, it would be an even tighter fit than paul's tube-box we saw the other day...
it looked like it was glowing.
i think a 12ax7 is a touch too large to fit in a boss battery compartment...looked like there was one in there.
as far as 'securely'...[ ]
ok i got to try this now. and see if it works. EDITED ok from what i am seeing in there i dont' think you can get a socket in there looking at my boss. but i am pretty sure you could get in there and put a tube in if you used the little inline wire clamps i was talking about before as the wires to hook into your tube pins. will post back in a couplle hours after i try this.
That's funny! I can imagine myself stepping on it and hearing CCRRUUUNNNNCCCCHHHH!!!!!!!!!!
(http://www.die-simpsons.de/pic-db/pic-upload/thumbs/pics/homer/homer0205.gif)(http://www.die-simpsons.de/pic-db/pic-upload/thumbs/pics/homer/homer0205.gif)(http://www.die-simpsons.de/pic-db/pic-upload/thumbs/pics/homer/homer0205.gif)(http://www.die-simpsons.de/pic-db/pic-upload/thumbs/pics/homer/homer0205.gif)(http://www.die-simpsons.de/pic-db/pic-upload/thumbs/pics/homer/homer0205.gif)(http://www.die-simpsons.de/pic-db/pic-upload/thumbs/pics/homer/homer0205.gif)(http://www.die-simpsons.de/pic-db/pic-upload/thumbs/pics/homer/homer0205.gif)(http://www.die-simpsons.de/pic-db/pic-upload/thumbs/pics/homer/homer0205.gif)
RDV
Quote from: RDVThat's funny! I can imagine myself stepping on it and hearing CCRRUUUNNNNCCCCHHHH!!!!!!!!!!
(http://www.die-simpsons.de/pic-db/pic-upload/thumbs/pics/homer/homer0205.gif)(http://www.die-simpsons.de/pic-db/pic-upload/thumbs/pics/homer/homer0205.gif)(http://www.die-simpsons.de/pic-db/pic-upload/thumbs/pics/homer/homer0205.gif)(http://www.die-simpsons.de/pic-db/pic-upload/thumbs/pics/homer/homer0205.gif)(http://www.die-simpsons.de/pic-db/pic-upload/thumbs/pics/homer/homer0205.gif)(http://www.die-simpsons.de/pic-db/pic-upload/thumbs/pics/homer/homer0205.gif)(http://www.die-simpsons.de/pic-db/pic-upload/thumbs/pics/homer/homer0205.gif)(http://www.die-simpsons.de/pic-db/pic-upload/thumbs/pics/homer/homer0205.gif)
RDV
D'OH!
If that is for real, I'm impressed! It's even got some holes drilled on the side, for ventilation I assume. What I wonder about is, how the hell do you get the tube out of there?!
Photoshop will put "glow" into a pic like that just fine.
why are so many people eaten up with the tube thing....?
i have a tube amp that i play through, and it sounds
WAY better than any ss amp that ive ever played....so i understand
it on that level....but it seems as if people are just eaten up with
the whole tube thing....keyboards with tubes behind glass.....
korg has a drum machine with a tube, and im really seeing it
alot in the recording industry....it's kind of silly really....
behringer has a mic pre that has a nifty little 12ax7 behind a glass
with an l.e.d. behind it.....
takamine has a tube in one of their acoustic guitars....which is
ridiculous if you ask me.....i would rather have an outboard tube
pre with an acoustic.... which, come to think about it, that's what
im using.... a presonus tube pre....with an l.r. baggs pickup. im not
using the tube pre because i wanted to impart a "warm" sound to
my tone, it's the only preamp i have, and i happened to have it
for recording. 99 bucks..... and most of the sound is jfet.
people are crazy about tubes in their gear, and most of it is low power
noisey stuff with no headroom....(like my presonus)
but then again, that's another topic.
im all about tube pedals and such, just because it's a fun diy....but
leave the sd-1 alone...it's a great pedal.... :)
the takamine tube pre in their guitar runs on 3 volts.... what's the
point of even having it in there?
http://www.takamine.com/?fa=cooltube2
sorry to get off topic there folks.... :roll:
resume...
Yeah, I thought that onboard preamp tube on a guitar was going a little far...
i find it neat personally and with the advantage of the little ehx transformers we could make a nice little tube box in a boss pedal.. sure theres no real reason as to why to do it. but eye candy sake.. but if we are going to just make it eyecandy why not jsut get some 6112's jor a 6112 adn a 6021 and make a nice little medium/highgain amp. out of it.
i am sure that if zvex can do it in a hammond he could do it in a boss box. come on z man make me a boogie in a boss pedal.
now as for the seriousness of this thread i went back to the shop and tried it. actually it works fine. however you need to keep in mind these things.
1. try to find a skinny 12ax7 [all tubes are not created equal lol]
2. if you still have that fet crap switching system your fine other wise you need to adjust your tpdt switch carefully.
3. it really works better to put it sideways but yo uhave to drill out where the spring goes. but when you do this the pedal cavity is fatter here and you dont' have to worry about crushing it.
Found more pic's
(http://www.diokay.com/images/prod/Tubesd3.jpg)
Claus H
The battery pocket of a boss pedal is 27mm wide, a 12AX7 is typical 22mm wide, no problem..
Thickness is the problem (That's what you meant by skinny) :) :) You need route out the bottom and the back of the battery compartment and I suppose a small socket could be placed in the there.. if you drill the hole in the front like in the picture you should be able to take out the tube easily...
Length of the compartment is 55mm and the length of a tube without it's tip is 50mm typical..
It's not an easy job but could be done.. you might use the two triodes of the tube as clipping "Diodes"
Claus H
Hmm any idea what the tube's doing in the circuit? The OPAMP is still on the board...
That looks like a pretty interesting mod.
Phillip
Quote from: Claus Hyou might use the two triodes of the tube as clipping "Diodes"
Sorry to Quote myself..
Writen about here http://www.geofex.com/Article_Folders/mandt.htm see Clipper using Grid-Cathode "Diode"
Claus H
What's the component replacing the diodes with "SD1" written on it? If it weren't for that mystery component, my first guess would be that the tube is being used in place of the clipping diodes. I'd imagine the Boss circuit would have to be modified to handle 12v as well.
Anyone want to take a stab at how you'd implement the tube into the SD-1 schematic as a clipping grid-cathode type dealie?
12volts?? 6.3v could do it, if you run the filaments in parallel instead of series..
Claus H
replace a couple of low voltage caps and change the current limiting resister powering the LED and sd-1 will run on 12v-16v or so.
Quote from: Claus H12volts?? 6.3v could do it, if you run the filaments in parallel instead of series..
Claus H
the tube "can do" the diode-thing down to 2V or even less at the filaments...
Ok tubes as clipping diodes...
Would that sound like Si Ge's or something else entirely.
what would be the clipping threshold?
Think there's any 'scoped' or percieved advantage to using a tube to clip signal tops and bottoms?
it makes sense...at least the tube is being used for something other than it's 'warm glow'...!!!
Quote from: puretubethe tube "can do" the diode-thing down to 2V or even less at the filaments...
Ahh...I see. This is getting interesting. I'm going to have to read up on this! Your Tube-Fuzz and Tube-Distortion use tubes for clipping diodes, don't they?
Imagine a tube mod for a big muff. There's plenty of room in those enclosures!
May I also add that I'm interested in this to satisfy my curiosity. I'm in no way under the impression that tubes will give my tone super mojo :P They just sound like an interesting change from the usual LED/Germanium/Si choices.
And no socket--there's stuff soldered right on the pins--now THAT'S what I call point-to-point!
Quote from: Ben NAnd no socket--there's stuff soldered right on the pins--now THAT'S what I call point-to-point!
Thats hard soldering. To much heat, and you'll desolder it from the inside.
The way I use to get past having to use a tube socket(if I'm out of that style) is I have a bunch of jumpers made with the sockets out of surplus rs232 jacks(serial port). I have a few of these kicking around so since it hasn't been soldered to yet, you can pop them apart then just solder wires to the sockets, heatshrink and your set. You may have to crimp the socket a bit for a tighter fit on the tube pin.
Regan
Quote from: bobbletrox
...Your Tube-Fuzz and Tube-Distortion use tubes for clipping diodes, don't they?....
only the Tube-Fuzz
(TM),
but in a different topology...
- the diodes need to be able to handle
well over 150Vpp signals -
Looks like it could be used as a Tube-Pedal-ripoff... think about it...a cheap clipper with a glowing tube in it... I can see it now: "add the warmth of tube to youe rig"...
$25 worth of and a $400 price tag
Ya know what guys, I'd probably do this project for the sheer novelty of it. Not that I would ever really use it (unless it sounded really great). I'd just do it so I could say "Yeah man, I modded an SD-1 to incorporate a tube in it's circuit. What the h*ll did you do today?" :D
...and the n00bz would be like: "WHAT?!" :shock:
Heh...
-HB
isn't that what we're all doing now? It's drawn so much attention, yet it's so simple. I don't see why I can't run up any of these kinds of ideas.
I've been intrigued with the idea of using tubes as clipping diodes for a while, but never persued it much because I thought it'd be really complicated. Seeing someone implement it as a mod to a mass produced pedal blew my mind because it must be reletively simple...yet I still can't work it out! lol.
The more simple tube circuits we have, the easier it will be for people to move into other tube-based circuits. It reduces the learning curve, because let's face it, going from solid-state effects to tube-based effects is daunting. Every little bit of experience helps, and something as simple as adding a tube for a clipping diode builds confidence for trying something bigger.
you could use one of those 20v 9v batteries to power it :-D
I posted a thread a while back about using tubes to clip. I think some smart conclusions were drawn....dont totally remmeber though...
Quote from: bobbletrox
...The more simple tube circuits we have, the easier it will be for people to move into other tube-based circuits. It reduces the learning curve, because let's face it, going from solid-state effects to tube-based effects is daunting. Every little bit of experience helps, and something as simple as adding a tube for a clipping diode builds confidence for trying something bigger.
that`s the right attitude, here, imho!
One shouldn`t forget, that the SD-1 is a box that imitates the behaviour
of a driven tube-amp through its topology
- just replacing the solidstate by a "real" diode will not automatically
turn it into a real tube amp -
but it might add another nuance to the Ge/Si/LED farm...
Quote from: tomboyreminds me a little of this:
http://www.geofex.com/FX_images/realtube.jpg :wink:
omg... Tomboy... LOL! The pic at the link had me rolling on the floor! Thank you!!
I know this thread is abit old but I just tryed this mod on a SD1 with a 12au7 tube and got great results. Its pretty easy to do and one tube can be used as 2 diodes or 1 diode. Im rehousing my SD1 so installing tube will be easy to do. Ill post a link when I get done with the pedal someday. :icon_wink:
How does the tube sound in it? How is it different? Any sound clips? Thanks!!
-Joe Hart
since space is tight and the 12AX7 is only being used as a diode, why not use those old 7-pin tube diodes like the 5726??? - dirt cheap, NOS quality, 6.3v heaters that will work off DC, AND they're almost half the size of a 12AX7. its a win win solution.
Quote from: Joe Hart on March 26, 2010, 10:07:54 AM
How does the tube sound in it? How is it different? Any sound clips? Thanks!!
-Joe Hart
Sounds kinda like the valvcaster but the gain is much more smoother when all the way up. Its got a good sound but it can be over powering at times. I think a resister or capasitor acoss the + and - will tame it a little. Dont know, still expermenting with it. As far as sound clips, Ill post it on youtube and and ppost the link. I just need to find time to finish the pedal. :icon_smile:
I don't know, I am not a fan of hybrid circuits...I don't want opamps with tubes in the same box. But yeah that's me!
Quote from: Renegadrian on March 26, 2010, 10:11:48 PM
I don't know, I am not a fan of hybrid circuits...I don't want opamps with tubes in the same box. But yeah that's me!
I see your point but I guess it depends on what you like. :)
Quote from: paulyy on March 26, 2010, 07:51:34 AM
I know this thread is abit old but I just tryed this mod on a SD1 with a 12au7 tube and got great results. Its pretty easy to do and one tube can be used as 2 diodes or 1 diode. Im rehousing my SD1 so installing tube will be easy to do. Ill post a link when I get done with the pedal someday. :icon_wink:
I tried this in a DS-1 a couple of years back (with a 12AX7 tube I think?). The tone was nice when you played through it but the background noise when you weren't playing was horrendous - was this something that you found? If so, any tips on how to combat it would be appreciated!
Quote from: kissack101 on March 27, 2010, 08:47:42 AM
Quote from: paulyy on March 26, 2010, 07:51:34 AM
I know this thread is abit old but I just tryed this mod on a SD1 with a 12au7 tube and got great results. Its pretty easy to do and one tube can be used as 2 diodes or 1 diode. I'm rehousing my SD1 so installing tube will be easy to do. Ill post a link when I get done with the pedal someday. :icon_wink:
I tried this in a DS-1 a couple of years back (with a 12AX7 tube I think?). The tone was nice when you played through it but the background noise when you weren't playing was horrendous - was this something that you found? If so, any tips on how to combat it would be appreciated!
Sounds fine. no background noise that I can recall. Haven't tried a 12ax7 yet. maybe its the tube. Don't know. I'm still learning the pros and cons of this mod my self. I did notice that you don't need to hook the tube up to any power source for this to work. The tube part is just for looks. :) Ill be out of town for a week but when I get back Ill have more time to experiment with this mod. I hope the pros out way the cons on this mod.
Quote from: paulyy on March 27, 2010, 10:45:17 AMI did notice that you don't need to hook the tube up to any power source for this to work. The tube part is just for looks. :)
My (albeit limited) understanding of tubes was that you had to heat the plates otherwise it simply wouldn't function? Is it really possible to use a 12A?7 tube passively as clipping diodes?
Quote from: kissack101 on March 28, 2010, 01:40:35 PM
Quote from: paulyy on March 27, 2010, 10:45:17 AMI did notice that you don't need to hook the tube up to any power source for this to work. The tube part is just for looks. :)
My (albeit limited) understanding of tubes was that you had to heat the plates otherwise it simply wouldn't function? Is it really possible to use a 12A?7 tube passively as clipping diodes?
Power or no power sounds the same to me. So far and I dont see why you couldnt use any 12A?7 with this mod. You Could get different sounds or just the same sound.
how did you hook this up? - I'd like to try this out.
ok, I hooked up a 12AX7 as a diode clipper according to the way I found demonstrated in another thread (the 9v valvecaster thread, page1). what I noticed was that in this diagram, the anode of triode1 is connected to the cathode of triode2 in order to make the 'diode'. this doesn't seem right to me as each triode is independent of the other, so it would make sense if the anode and cathode of the respective triode sections made the 'diode' (i.e. pins 1 and 3, then pins 6 and 8).
when I tried the valve diode clipping with the anode of triode1 connected to the cathode of triode2 in order to make the 'diode' (and vice versa for the other anode and cathode to make a back-to-back pair), I got the exact same tone whether the valve had voltage applied to the heaters or not and also whether the valve was in the socket or completely removed (i.e. there are no clipping diodes 'in circuit'). this would explain one of the previous poster's findings where he stated the same results were gained regardless of any voltage being applied to the heaters.
I'm gonna try it the way I think this 'should' work, but I'm not hopeful of this working as it didn't when I tried it with a 5726/6AL5 (it's been suggested that this is because the valve diodes require a larger PP voltage to break over than a silicon diode; which would make sense).
ok, tried this again - no dice, I get less gain than in bypass.
pins 1 to 3 connected, then pins 3 and 6, then 6 to 8, then 8 to 1 - that should give the diagrammatic equivalent of a back to back diode pair (right?).
if anyone has successfully got a 12AX7 to clip in a SD-1, please help me out here.
Cheers!!!
Quote from: MetalGod on April 03, 2010, 11:50:16 AM
how did you hook this up? - I'd like to try this out.
I got the idea from the same thread. The 9V Valvecaster Thread. I like the way it sounds but I think it might be to much. I have to dial my settings way down to get it sound good.
Quote from: paulyy on April 03, 2010, 03:37:31 PM
Quote from: MetalGod on April 03, 2010, 11:50:16 AM
how did you hook this up? - I'd like to try this out.
I got the idea from the same thread. The 9V Valvecaster Thread. I like the way it sounds but I think it might be to much. I have to dial my settings way down to get it sound good.
I've tried it like in that thread - the diodes don't clip.
Any chance you can post pictures so I can see exactly how you've wired this up.
I've played with this some more, and to get the valve diode arrangement in a 12AX7 to clip, you need to tie the grid to the plate. After all this effort, I can report that its not really a very satisfying too - HARD clipping like Ge diodes when used in an SD-1.
Quote from: MetalGod on April 05, 2010, 09:08:20 AM
I've played with this some more, and to get the valve diode arrangement in a 12AX7 to clip, you need to tie the grid to the plate. After all this effort, I can report that its not really a very satisfying too - HARD clipping like Ge diodes when used in an SD-1.
You could try it with some other diodes (like LEDs or 4148s) in series. That would bring the clipping threshold up. Not saying it will sound good though! It seems to me that a tube is a pretty expensive set of clipping diodes...
It does look pretty sweet though. ;)
I know this is a necro thread revival, but I recently replaced the clipping LEDs in a Crunchbox for poops and giggles with a 12ax7 I had lying around, using this layout here, and only 9v after seeing something about the Zendrive 2.
(https://i.postimg.cc/mz3G7yS3/13533081-1112042675520033-1725548912972452204-n.jpg) (https://postimg.cc/mz3G7yS3)
It worked, but it was massively bassy. I messed around a bit with the input cap but I couldn't get what I wanted out of it. It was a bit of fun but that's about it.
Yeah I've never been thrilled with tubes as clippers. I figure if you're going to put one in a circuit, it may as well be a gain stage or two ;D