“Vintage Vibe” Low Voltage 6111 Submini Tube Vibrato

[biggy boy]

Found this site
It's a simple all tube phase shift osilator (tube vibrato) He's running it at a high voltage.
Not sure if it would work at 12-24 volts?

http://terrydownsmusic.com/technotes/vibratocircuits/vibrato_circuits.htm


Glen

[frequencycentral]

Found this site
It's a simple all tube phase shift osilator (tube vibrato) He's running it at a high voltage.
Not sure if it would work at 12-24 volts?

http://terrydownsmusic.com/technotes/vibratocircuits/vibrato_circuits.htm


Glen

Tube PSO's don't work at low voltage.    It's no real loss, as a transistor PSO sounds the same as a tube PSO, ie neither are in the signal path.

Though it might be do-able using a tapered PSO: http://www.freewebs.com/valvewizard2/TaperedPhaseShiftOscillators.pdf

[nordine]

didn't have 6111, so i tried it using some 12au7s

got nothing resembling vibrato or something of that sort

did you try this on other tubes, freq?

[frequencycentral]

didn't have 6111, so i tried it using some 12au7s

got nothing resembling vibrato or something of that sort

did you try this on other tubes, freq?

I've tried both 6111 and 7327 subminis with success. I can't see any reason why it should not work with two 12AU7. You just need to ensure that the two cathodyne phase inverters are giving out signals at the plate and cathode that when mixed cancel each other out.


EDIT: With 12AU7 you may also need to change to plate and cathode resistors on the first and last stages to achieve unity wit the bypassed signal, as those tubes have different gain to the ones I used.

[svstee]

Would anyone be interested in a Vero layout for this? I want to build it, but if I'm just makeing one for myself I'll use the Perf one that frequencycentral generously did. If anyone else thinks they might find a Vero layout useful, however, I'll give it a shot, and I prefer
Vero over Perf anyways.

[Br4d13y]

i would like a vero

now that smallbear supplies 6111's i can jump on all these tube projects

[letterbeacon]

I seem to have most of the parts for this project in my parts box except the 6111s and the LDRs.  Is there a UK or European supplier of 6111s at all?  I've never bought LDRs before, what kind of specs should I look for when I'm browsing Rapid or Maplin?

Thanks a lot!

[frequencycentral]

I used these LDR's:

http://cgi.ebay.co.uk/5-x-LDR-Miniature-Light-Dependant-Resistor_W0QQitemZ120048292522QQcmdZViewItemQQptZUK_BOI_Electrical_Components_Supplies_ET?hash=item1bf36f92aa

I buy my 6111 from this guy:

http://cgi.ebay.co.uk/4-NOS-Raytheon-6111-submini-Vacuum-Tubes_W0QQitemZ200394265207QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item2ea86dd277

[letterbeacon]

Brilliant - thanks a lot!

[letterbeacon]

frequencycentral - did you get your stompbox enclosure from Maplin?  If so, do you have an order code for it?

Thanks!

[frequencycentral]

frequencycentral - did you get your stompbox enclosure from Maplin?  If so, do you have an order code for it?

Thanks!

Alloy Box 111 x 60 x 27 N89BQ  £3.79  http://www.maplin.co.uk/module.aspx?moduleno=43713

.....but I get mine from Rapid: EDDYSTONE CASE 111 X 60 X 27MM (RC)   30-1532 £2.95   http://www.rapidonline.com/productinfo.aspx?&tier1=Tools%2c+Fasteners+%26+Production+Equipment&tier2=Cases&tier3=Metal+Cases&tier4=Eddystone+series+diecast+aluminium+enclosures&moduleno=71713&catref=30-1532&kw=30-1532

[Jimmy-H]

Hi Rick!

It's been a while since I've been active here.
But I have seen all your work, and it's great to see so much stuff you've done!

And I have a question about the Vibe.
I'm in a build of one right now.
But there is a lot of loss in the heights ( especially when the led is bright ).
Is this normal?

And keep on doing all that great stuff Rick!

[frequencycentral]

Hi Jimmy, long time no see!

I'd agree there's loss of highs at maximum depth, should be ok around 2 or 3 o'clock though. I was happy enough not to worry about it when the depth is maxed out - it's kind of a different effect. I usually have my depth set at around halfway. This would definately depend on the luminosity of the LED you're using. You could try increasing the 6k8 resistor before the depth pot to suit where you want maximum luminosity to be.

[Michal_R]

Hi, is it possible to add 5mm LED, which behave in a similar way as the main LED? I would like to put it on the outside, as a status LED.

[duck_arse]

if you mean as a rate indicator, then, yes you can. look here:

http://www.diystompboxes.com/smfforum/index.php?topic=90809.msg772915#msg772915

this vibe also uses a phase-shift oscillator. you should be able to work it out .......

[edit:] and now I look at frequency central's circuit, I remember he uses a buffer transistor in his osc. I have built, and prefer his setup, and have fiddled a rate led into it, but it is on the other machine, so it will take me a few days.

[edit again:] probably just insert the led between the 10k to positive and the base of the top transistor. can't hurt.

[dileobass]

Hello guys, just signed up been lurking for a long time. I'm new at pedal building but have had years of practice as my dad is an electrical technician.

This was my first tube project. If anyone can help out here, maybe rick is out there I've built the vintage vibe a few months ago its one of my all time favs! Only thing is now it seems I've lost 50% of my volume and gain, tube heaters still light up well but I'm guessing one has died. Any thing else I could look at before I dig out the two tubes? Would the ldr cause a loss of volume if one fails, maybe wishful thinking.
These tubes really need sockets of some sort, maybe screw in wire terminals.
Stay well!

[frequencycentral]

Hello guys, just signed up been lurking for a long time. I'm new at pedal building but have had years of practice as my dad is an electrical technician.

This was my first tube project. If anyone can help out here, maybe rick is out there I've built the vintage vibe a few months ago its one of my all time favs! Only thing is now it seems I've lost 50% of my volume and gain, tube heaters still light up well but I'm guessing one has died. Any thing else I could look at before I dig out the two tubes? Would the ldr cause a loss of volume if one fails, maybe wishful thinking.
These tubes really need sockets of some sort, maybe screw in wire terminals.
Stay well!

I doubt an LDR has died, in any case it wouldn't cause loss of volume. More likely a tube stage, or maybe even a dry joint. It would be worth overflowing all the soldering.

[dileobass]

Hey thanks for the reply Rick, love your work BTW
I will have a look at the joints and see where there may be a dry one, i can find, on one tube, the affect from the LED in relation to resistance, however the other tube shows no affect.

Anyway I'll order some more tubes if i can fix it then i have some spares to play with!   

[dileobass]

All done and swapped a tube over which was reading some high resistance, i took more a guess on it also. Working well again.

when i figure out how to post pics I'll add one in.

Cheers

[Mgt280y]

Sorry I know this is old now but trying to source ldr for this and can't find anything that matches the specs there is any old eBay link but it has expired anyone know where I can get them?