Ok, so you have a few choices so far. There's The Tone God's Bullitt (http://www.geocities.com/thetonegod/bullitt/bullitt.html), there's my Vibracaster (http://www.diystompboxes.com/smfforum/index.php?topic=70160.0) and also my Bipolar Disorder (http://www.diystompboxes.com/smfforum/index.php?topic=69334.0).
I'm getting into 5672 tubes at the moment. I like them because the filament only consumes 50ma, that's a third of what a 12AU7 consumes. That makes 5672 perfect for pedalboards without sucking the juice too much.
I've just done a little experiment to see how a 5672 would work as a tremolo, and it went well, just needs a bit of tweaking.
The thing is, I've already got two trems, a Bipolar Disorder and a Vibracaster........I don't need another trem - but does the world need another trem, that's the question?
So, should I develop this circuit for the common good of mankind, or just move on?
(http://i210.photobucket.com/albums/bb292/frequencycentral/closeup-6088a.jpg)
The smaller the tubes, the smaller the enclosure. Pretty soon you'll be into 1590As. And the 50ma draw is a great improvement.
And it can never hurt to provide the world with more options. Hell, there are hundreds of fuzzes, why not another tube trem. I'm sure someone will appreciate it.
You're a @#$%in nut, man. :icon_mrgreen:
Whats the worst thing that could happen if you made another one? You'd have another awesome tremolo? You might learn more? It could sound better then the other ones?
Holy shit man, never stop.
Good so far - but I'm looking for TEN votes before I unleash it on an unsuspecting world........
Count another vote!
make it a phase shift vibrato like the in the magnatone amps ;)
http://home.comcast.net/~seluckey/magnatone/magnatone.htm
bfore asking for another low volt tube trem, i'd like to ask... is there any samples from the ones you made?
cause:
-i'm curious
-and, maybe the new one could implement things the first hasn't... new waveform (most likely), filtering, modes, etc
Quote from: birt on September 28, 2008, 03:47:58 PM
make it a phase shift vibrato like the in the magnatone amps ;)
I'm working on that too - but that's another project!
Quote from: nordine on September 28, 2008, 03:54:47 PM
bfore asking for another low volt tube trem, i'd like to ask... is there any samples from the ones you made?
If you click on 'Builds' in my signature there's a clip of the Vibracaster.
Quote from: nordine on September 28, 2008, 03:54:47 PM
-and, maybe the new one could implement things the first hasn't... new waveform (most likely), filtering, modes, etc
Waveforms sounds interesting. Filtering - tell me more. What modes would you want?
Quote from: frequencycentral on September 28, 2008, 03:57:40 PM
Waveforms sounds interesting. Filtering - tell me more. What modes would you want?
All of the modes, and lots of different filtering. Make it a unit to put ontop of an amp, like the re201. Except your only challenge would be to find the right enclosure. That would be awesome.
Quote from: nordine on September 28, 2008, 03:54:47 PM
-and, maybe the new one could implement things the first hasn't... new waveform (most likely), filtering, modes, etc
Waveforms sounds interesting. Filtering - tell me more. What modes would you want?
[/quote]
filtering, like tremoloing only bass content and leaving a clean treble on top, or the opposite
modes - smooth or chopped, or stutter tremolo... stutter more than square wave, i mean, total on - off
heard the sample, the wave does the job pretty much nicely, sounds cool, it surprised me
what got me thinking whats the somewhat 'contrived' quality of the sound
i know its a bias tremolo, but it goes to far i think... i figure the difference between tremolo ON-OFF, in terms of volume and openness of the sound is very noticeable
before launching on esoteric modes, as a suggestion, i'd figure out how to get a round and strong temolo sound, pairing up with the clean signal (i'm thinking on live stuff and getting lost in the mix)
edit: also you have different tremolo design options, you alrady tried bias, then there is opto, shunting to ground trem, and the kind that uses the tube as a variable series resistor
Does the world need another Tremolo ? why not !!!! Not to mentioned all the other ideas that will comes in your mind ;) go Go GO, you've got another vote ! :)
Shall I write that you have to count another vote?! :icon_wink:
Quote from: nordine on September 28, 2008, 04:27:23 PM
filtering, like tremoloing only bass content and leaving a clean treble on top, or the opposite
modes - smooth or chopped, or stutter tremolo... stutter more than square wave, i mean, total on - off
heard the sample, the wave does the job pretty much nicely, sounds cool, it surprised me
what got me thinking whats the somewhat 'contrived' quality of the sound
i know its a bias tremolo, but it goes to far i think... i figure the difference between tremolo ON-OFF, in terms of volume and openness of the sound is very noticeable
before launching on esoteric modes, as a suggestion, i'd figure out how to get a round and strong temolo sound, pairing up with the clean signal (i'm thinking on live stuff and getting lost in the mix)
edit: also you have different tremolo design options, you alrady tried bias, then there is opto, shunting to ground trem, and the kind that uses the tube as a variable series resistor
The very significant difference I have found with 5672 pentodes vs 12AU7/6111 triodes is that with the triodes I'm modulating the cathode bias, and the tube's gain is at maximum with the cathodes grounded. Whereas with 5672 pentodes I'm modulating the screen grid and the tube's gain is at maximum at about 6 volts ( I'm using a 12 volt power supply), minimum when grounded. So the 5672 is acting a lot more like an OTA such as CA3080 or LM13700. Familiar territory for me, and very 'synthy'......I think I'll be able to do a lot with these submini pentodes which has so far eluded me with triodes - square wave modulation, S/H, stereo panning and doppler etc. It makes the whole business of applying a phase split LFO to two tube stages easier too.
Quote from: frequencycentral on September 28, 2008, 08:32:46 PM
Quote from: nordine on September 28, 2008, 04:27:23 PM
filtering, like tremoloing only bass content and leaving a clean treble on top, or the opposite
modes - smooth or chopped, or stutter tremolo... stutter more than square wave, i mean, total on - off
heard the sample, the wave does the job pretty much nicely, sounds cool, it surprised me
what got me thinking whats the somewhat 'contrived' quality of the sound
i know its a bias tremolo, but it goes to far i think... i figure the difference between tremolo ON-OFF, in terms of volume and openness of the sound is very noticeable
before launching on esoteric modes, as a suggestion, i'd figure out how to get a round and strong temolo sound, pairing up with the clean signal (i'm thinking on live stuff and getting lost in the mix)
edit: also you have different tremolo design options, you alrady tried bias, then there is opto, shunting to ground trem, and the kind that uses the tube as a variable series resistor
The very significant difference I have found with 5672 pentodes vs 12AU7/6111 triodes is that with the triodes I'm modulating the cathode bias, and the tube's gain is at maximum with the cathodes grounded. Whereas with 5672 pentodes I'm modulating the screen grid and the tube's gain is at maximum at about 6 volts ( I'm using a 12 volt power supply), minimum when grounded. So the 5672 is acting a lot more like an OTA such as CA3080 or LM13700. Familiar territory for me, and very 'synthy'......I think I'll be able to do a lot with these submini pentodes which has so far eluded me with triodes - square wave modulation, S/H, stereo panning and doppler etc. It makes the whole business of applying a phase split LFO to two tube stages easier too.
sounds exciting :icon_mrgreen:
please keeps us informed of these findings, the pentode thing really seems the way to go, thats what i was talking about
an all tube S&H strikes me as real raunchy sounding device, well what im really thinking off is an aliaser... don't have the time to experiment with those, but would help beta testing ideas any day, if you want some help
go for it! you can count my vote.
1up
Yes please!!! As you know I have a glut of 5672s at present!
Quote from: frequencycentral on September 28, 2008, 08:32:46 PMFamiliar territory for me, and very 'synthy'......I think I'll be able to do a lot with these submini pentodes which has so far eluded me with triodes - square wave modulation, S/H, stereo panning and doppler etc. It makes the whole business of applying a phase split LFO to two tube stages easier too.
As a chorus of enthusiastic voices seamed to rise in my head, can my vote count for 10 ? :icon_mrgreen:
(And don't forget the up ore down sawtooth..)
Another vote, and my suggestion for the "more waveform control" would be dual LFOs, for weird syncopation and fun.
I'd like to see an All-Tube Tremulous Lune that fits in a 1590A. :icon_twisted:
Count me in too. ;D
+1. Any new tube project gets my vote. :icon_biggrin:
(http://www.geargeek.net/images/moar-cat.jpg)
did this idea get dropped ?
Where're we at with the votes needed ?
Count me in - if we're close I'll create another screen name for more votes ;D
Dan
It's still a goer - I just need to get a few LT1054 to experiment with, as the LFO I have in mind requires a bipolar supply to make it work with the 5672. It should give upward saw/triangle/downward saw (continuously variable) as well as 10% to 90% pulse. Worth the wait?
waiting........ ;D
A little off topic, but do you know of another LFO besides the one provided that will work in the vibracaster? I finally got it oscillating after tweaking, but now I am having trouble getting it to run as I would like it to, and wondered if there was an LFO that uses 5088's or lower, as they are the highest gain part I have.
Also, I vote yes 5 times ;D
Tubes - good
Tremolo - good
Tube + Tremolo...Good times 2 :icon_biggrin:
After all, if we can have 92874 distortion/OD, why not deepen the trem pool.
Zach
I've got my 5672's on the way........need a new project.....need to etch............
Ok, after a few experiments with this multi waveform LFO (http://members.tripod.com/urekarm/synth/ms20lfo.pdf) I have to report that I am a little disappionted! I was hoping to do a real funky little tremolo with loads of waveform options. However, what I'm finding is that anything with a sharp edge (sawtooth/square/pulse) is just creating a sharp thunk! Using an electrolytic cap from the 5672's 'control' input (pin 2) to ground does get rid of the thunk - but also slews the waveform into something close to a triangle/sine. This is the same issue I had when experimenting with tremolos base on 12au7 and 6111 triodes. So - a 5672 tremolo is still viable, but the waveform options are limited to triangle/sine (which in practice both sound very similar). After this, what's left is a 5672 tremolo which would use a similar phase shift oscillator to the Vibracaster. Back to the breadboard!
I should also point out for anyone interested that the LFO I linked to above has issues. The BF245A FETs don't work - I eventually used BS170 MOSFETs to get the shape control to work without affecting the speed.
Quote from: frequencycentral on December 28, 2008, 09:58:38 AM
Ok, after a few experiments with this multi waveform LFO (http://members.tripod.com/urekarm/synth/ms20lfo.pdf) I have to report that I am a little disappionted! I was hoping to do a real funky little tremolo with loads of waveform options. However, what I'm finding is that anything with a sharp edge (sawtooth/square/pulse) is just creating a sharp thunk! Using an electrolytic cap from the 5672's 'control' input (pin 2) to ground does get rid of the thunk - but also slews the waveform into something close to a triangle/sine. This is the same issue I had when experimenting with tremolos base on 12au7 and 6111 triodes. So - a 5672 tremolo is still viable, but the waveform options are limited to triangle/sine (which in practice both sound very similar). After this, what's left is a 5672 tremolo which would use a similar phase shift oscillator to the Vibracaster. Back to the breadboard!
I should also point out for anyone interested that the LFO I linked to above has issues. The BF245A FETs don't work - I eventually used BS170 MOSFETs to get the shape control to work without affecting the speed.
what about optical?
Hmmmm - really I wanted to modulate the 5672 directly into grid 2 (pin 2). Using a 12 volt supply, ground to grid 2 = 5672 closed, 6 volts to grid 2 = 5672 open. So I was aiming for a LFO which went from 0v to 6v, hooked into grid 2. I've got no optocouplers, but I do have LDRs, LEDs and a few NEC2501 transistor type photocouplers. I guess I'll try them.
Hell yeah ! I'm in ! ;). Boy, it is so glad to be back here ;D