"Delirium" 5672 Submini Pentode Tremolo/Boost - for danielzink !!

[frequencycentral]

I mentioned a while about doing a tremolo using a 5672. danielzink promptly bought some 5672's. Ever since, Dan has been politely asking about it in various threads - I feel guilty every time he mentions it. I made a few attempts, but what foxed me was getting the depth control right. I had another stab at it today and finally got it right. So here's "Delirium" - the danielzink memorial tube tremolo, which I now expect him to build in a 1590A.

The tremolo speed goes from 'machine gun fast' to 'is it still on?' slow. Even slower speeds can be obtained by changing the speed pot for 47K or 100k, but for a useable range 22K or 27K is just fine. I power all my effects off a 12 volt supply, which with this effect means a decent amount of clean boost is available in addition to the tremolo. Powering it off 9 volts will give less boost.

I've included a few options for powering the 5672's heater in the schematic.

If you want to add a rate LED, just hang it off the output of the second opamp (before the depth control) which a suitable resistor ( I used 1K on the breadboard).

5672's can be a little microphonic, so it's worth using some foam around the tube to pad them. Don't expect them to glow - they don't! They don't heat up either.

That's it! have fun Dan!

[Valoosj]

Looks cool! I might give it a go as well. How pricy are those tubes?

[frequencycentral]

They're pretty cheap - have a look on Ebay. I've done a few other designs using them if you buy a few. Have a look in 'Schematics' in my signature.

[biggy boy]

So I guess all those pointy black things got to the plus 12volts right?
There isn't a need for Vref voltage for the Opamp correct?

OK for the million dollar question Can I use it on a ValveCaster?


Glen

[frequencycentral]

Hi Glen, yeah the pointy black things go to +ve, 9 volts or 12 volts. Most people use 9v, I use 12 due to the convenience of powering my huge array of tube pedals! that's why I gave the different heater power options.

The two 220K resistors form a voltage divider which is the vref for the opamp. The LFO is not my design, it appears in a few different designs, I have no idea who originated it. I just tweaked the values to suit the circuit.

OK for the million dollar question Can I use it on a ValveCaster?

Do you mean the LFO? I'll check that on the breadboard and report back.

[biggy boy]

 [/quote]

Do you mean the LFO? I'll check that on the breadboard and report back.
[/quote]

Yup

[Ice-9]

Wow ! Rick i didn't realize those valves were so small, i might see if i can get me some of those.

[Renegadrian]

Still got 4 submini 5678 - I used one in Rick's Pentaboost, so I checked you can swap the two. I am gonna try this one with the submini I got, then. As for the opamp, will a TL072 work?! I think it should be fine...

[danielzink]

it brings a tear to this eye...........




a 1590 based tube project ? ! ? ! ? !
I'M ON IT  !!!


Thanks RIck - I'll be hacking away on it soon !

Just gotta get a PCB formulated...........


Dan

[Cardboard Tube Samurai]

Can anyone understand French here? I'd like this datasheet translated to check suitability for such a tube project ---> http://tubes.mkdw.net/sheets/084/m/ME1403.pdf. I can only find it in French and wouldn't have a clue how to decipher it. I happen to have one of these tubes lying around and want to put it to use

[danielzink]

I'm going to push my luck here.....2 times.....

#1. I suck at pcb layouts - especially when an opamp is involved - anyone wanna whip this up ?

#2. really pushing my luck as Rick just designed a tube tremelo due to my incessant hounding...but......sort out that tube panner dude ! that thing is off the wall...

Thanks !!

Dan

[frequencycentral]

Can anyone understand French here? I'd like this datasheet translated to check suitability for such a tube project ---> http://tubes.mkdw.net/sheets/084/m/ME1403.pdf. I can only find it in French and wouldn't have a clue how to decipher it. I happen to have one of these tubes lying around and want to put it to use

Otherwise known as a 4068, here's the data sheet in English: http://frank.pocnet.net/sheets/009/4/4068.pdf

[biggy boy]

The two 220K resistors form a voltage divider which is the vref for the opamp. The LFO is not my design, it appears in a few different designs, I have no idea who originated it. I just tweaked the values to suit the circuit.

Oh Duh how did I miss that?, it's so obvious.

[Cardboard Tube Samurai]

Can anyone understand French here? I'd like this datasheet translated to check suitability for such a tube project ---> http://tubes.mkdw.net/sheets/084/m/ME1403.pdf. I can only find it in French and wouldn't have a clue how to decipher it. I happen to have one of these tubes lying around and want to put it to use

Otherwise known as a 4068, here's the data sheet in English: http://frank.pocnet.net/sheets/009/4/4068.pdf

Cheers! So by that, I guess it's not really suitable for anything pedal related... or am I missing something?

[frequencycentral]

Can anyone understand French here? I'd like this datasheet translated to check suitability for such a tube project ---> http://tubes.mkdw.net/sheets/084/m/ME1403.pdf. I can only find it in French and wouldn't have a clue how to decipher it. I happen to have one of these tubes lying around and want to put it to use

Otherwise known as a 4068, here's the data sheet in English: http://frank.pocnet.net/sheets/009/4/4068.pdf

Cheers! So by that, I guess it's not really suitable for anything pedal related... or am I missing something?

I'd give it a try - what's stopping you? Tubes are very forgiving of abuse!

[Cardboard Tube Samurai]

what's stopping you?

Knowledge

[Darkness, Darkness]

Can anyone understand French here? I'd like this datasheet translated to check suitability for such a tube project ---> http://tubes.mkdw.net/sheets/084/m/ME1403.pdf. I can only find it in French and wouldn't have a clue how to decipher it. I happen to have one of these tubes lying around and want to put it to use

Oui je comprends le Français    The difficulty here will be 'my english' 

So it's a subminiature pentode
Heaters ('chauffage') : DC only 1,25 V  8,2 mA (1,1 V min , 1,5 V max)
Grid 2 Voltage   ('Tension de la grille') - see schematic on page 2  : 5V min /  6,5 V average /  7,5 V max
Grid 1 voltage at grid current inversion (there must be a better translation but I don't know... the idea suggested here is that there is a voltage at which point the current change)   : - 1,15V average
Amplification factor ('Coefficient d'amplification'): 80 min  /110 average
Plate voltage ('anode voltage') : 45 V max
Grid 2 volatge : 45 V max
cathod current must not exceed 18 uA

Soldering must be done a least at 0,51 inches from the tube glass envelop. Tube connections should be bend at least at 0,059 inches from the glass envelop

Hope this will help

[frequencycentral]

what's stopping you?

Knowledge

Just looking at the 4068 data sheet, I'm pretty sure it could be used in this circuit for example. You'd just have to observe the correct pinout as it differs from the 5672. Use a LM317 (as above) to power the heater @ pin 1. Pin 3 to ground. Pin 2 is the input. Pin 4 is the output. Apply the LFO to pin 5. Pin 1 probably has a red dot to identify it.

[Darkness, Darkness]

oops   too late, Frequency Central seems to have answered quicker  

[frequencycentral]

#1. I suck at pcb layouts - especially when an opamp is involved - anyone wanna whip this up ?

I just bet Valoosj will provide one.

#2. really pushing my luck as Rick just designed a tube tremelo due to my incessant hounding...but......sort out that tube panner dude ! that thing is off the wall...

Damn! I hoped you wouldn't notice. Ah well, back to the breadboard.