Tube Stereo Panning - The Submini Tube Obsession Continues.........

[frequencycentral]

I just developed this on the breadboard tonight. I like it a lot. It needs developing in terms of adding a depth control - I'm thinking about how to implement that at the moment.

Soundclips to follow..............

[frequencycentral]

Quick soundclip: http://www.aronnelson.com/DIYFiles/up/Tube_Panner.mp3

Signal path: Squier Tele Custom (HB)  >  ColorMuff  >  Tube Stereo Panner  >  Soundcard  >  Wavelab

The ColorMuff is my version of the COKF with a BM tonestack.

[g.]

oh oh
great sound here !

[earthtonesaudio]

Just a quick suggestion:
Instead of the 317 as a low-voltage regulator, I'd use a resistor in series with an LED or a couple diodes.  1.25V is about the minimum voltage a 317 can put out, which might be why it's giving you some trouble.


ASCII art:

Power in -----\/\/\/\----|--------To Heaters
                                   |
                                  LED
                                   |
                                 GND

[frequencycentral]

Just a quick suggestion:
Instead of the 317 as a low-voltage regulator, I'd use a resistor in series with an LED or a couple diodes.  1.25V is about the minimum voltage a 317 can put out, which might be why it's giving you some trouble.


ASCII art:

Power in -----\/\/\/\----|--------To Heaters
                                   |
                                  LED
                                   |
                                 GND

Thanks, I worked out that a 215 ohm / 1 watt resistor would give the correct voltage drop for one 5672 tube, I just haven't got any to hand. So porbably a 100 ohm/ 1 watt would be fine for two of them. Also, if someone would care to check my math.

5672 > 1.25 volts / 50 ma heater requirement.

10.75 volts / 50 ma =  215
10.75 volts x 50 ma = 0.5375

10.75 volts / 100 ma = 107
10.75 volts x 100ma = 1.07

[frequencycentral]

Here's a clean soundclip: http://www.aronnelson.com/DIYFiles/up/Rhodes_Panner.mp3

Signal path: Rhodes Stage Piano 73 MK1  >  Tube Stereo Panner  >  Soundcard  >  Wavelab

I've noticed some subsonic pumping -inaudible, but it registers in Wavelab - and I can see my speaker cones moving even when I'm not playing - so I've changed the two output caps from 1uf to 0.01.

[Renegadrian]

Rick your works leave me speechless...Another beer for you...Cheers!!! 

[eddieod]

Any news on behalf of the "depth" control Rick?

Keep up the good work!

Edwin

[mnordbye]

Love the sound of that tube panner Rick! Confuses the dogs though.. 

[frequencycentral]

Any news on behalf of the "depth" control Rick?

This circuit came out of my experiments towards a tube vibrato/Leslie sim, I got sidetracked by the Red Star Drive, but my next project is to complete the tube vibrato/Leslie sim. Whatever method of depth control I use for that project will also be the one for this project. Stereo panning is a great effect, but perhaps not so useful for guitarists, who tend to run in mono, so I'll probably end up doing a version with a voltage control input for my modular synth.

Love the sound of that tube panner Rick! Confuses the dogs though.. 

Yeah my dog is confused by it too, he always thought that thermionic pentode vacuum tubes were used exclusively for amplification.......

[danielzink]

I'm watching this thread closely - as well as the 5672 tremolo thread.

Any progress on this one lately ?

Thanks, Dan

[frequencycentral]

I'm watching this thread closely - as well as the 5672 tremolo thread.

Any progress on this one lately ?

Thanks, Dan

Well I had a little tinker with it over the holiday. I used the Tremulus Lune LFO. It worked well as an LFO for the 5672. The challenge at the moment with it is implementing a depth control. It should be straightforward, but its not. I'm not getting the same predictability I got with the Vibracaster, ie the volume should stay the same with a gradual increase/decrease in modulation over the range of the depth pot. It doesnt so far. So its on the backburner for a while until I get my head around it. On another tack - did you see the low voltage 5672 amp thread? Again - more work needed there, but promising. Today I breadboarded a similar idea which is basically a Pepper Shredder with an output transformer. It sounds great!

[danielzink]

around it. On another tack - did you see the low voltage 5672 amp thread? Again - more work needed there, but promising

I did...but I only have 3 5672's !...........

I know....ebay is but a click away.........



Dan

[jackies]

Cool!
Been looking to build a device like this for my rhodes!
I have loads of all sorts of tubes, but none of these...
Can "normal" tubes be used in here? Like, not little bitty ones? With normal (300v) voltages?

I can of course buy some of these...
But I like building stuff with parts from my drawer...
Thanks for all your hard work!

[frequencycentral]

Cool!
Been looking to build a device like this for my rhodes!
I have loads of all sorts of tubes, but none of these...
Can "normal" tubes be used in here? Like, not little bitty ones? With normal (300v) voltages?

I can of course buy some of these...
But I like building stuff with parts from my drawer...
Thanks for all your hard work!

Yup - sounds great with Rhodes - you heard the soundclip? I'm not sure if this would work the same at high voltage, as the LFO modulates grid 2 between 0v and 6v approx. You could do some testing maybe. Or try it at low voltage with normal big tubes. If you do that, bear in mind that the 5672 are directly heated, ie grid 3 is internally connected to the filament +ve (and gets 1.25v). Or try it with some 5672, they are pretty cheap. While you're about it, maybe you could figure out a depth control so I don't have to! Have fun.

Rick

[carrejans]

Here's a clean soundclip: http://www.aronnelson.com/DIYFiles/up/Rhodes_Panner.mp3

Signal path: Rhodes Stage Piano 73 MK1  >  Tube Stereo Panner  >  Soundcard  >  Wavelab

I've noticed some subsonic pumping -inaudible, but it registers in Wavelab - and I can see my speaker cones moving even when I'm not playing - so I've changed the two output caps from 1uf to 0.01.

Oh man, I just melt from the sound of a Rhodes. (someday I want one too) 

[jackies]

 
Thanks for the prompt answer!
I just ordered 10 5672 from ebay...
Let the frenzy begin!!!

[danielzink]

Did this ever get any farther ?

I just blew the dust off my 5672's and started thinking about them again.....






Dan

[Ripthorn]

Somehow I never saw this thread, but another great looking project.  Though my current ambitions for my 5672's is a pair of tube microphones...

[moonbird]

Sorry to revive this old thread -- however I am looking to build a pedal controlled stereo panner -- can this design be adapted to that purpose?? Thanks.