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Thread: Seymore Duncan Twin Tube Classic pedal

  1. #1
    Alf
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    Seymore Duncan Twin Tube Classic pedal

    The Seymour Duncan Twin Tube classic is a new fx pedal with a special type of tube.
    I was really surprised when I read that the 6201 tube is equivalent to an ecc81 which I thought was only used in the PI (Phase inverter) of a tube amp. The samples on their site sound really good.

    Has anybody ever tried any other oddball tubes in a preamp (or booster, distortion) ?

    I myself have experimented with some other rf tubes which aren't bad at all.


    Alf

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    I have a Twin Tube and I have to say for what it is, I like it.

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    Quote Originally Posted by Alf View Post
    Has anybody ever tried any other oddball tubes in a preamp (or booster, distortion) ?
    Most of the popular 12xx7 tubes wind up getting tried in every preamp position at one time or another in search of sonic nirvana. That's why they get referred to as 12xx7 instead of 12AX7, 12AU7, 12AT7 in a lot of discussion.

    The real oddballs are the asymmetrical dual triodes like the 12DW7, which (IIRC) is one 12AU7 triode and one 12AX7 triode ... or something. Handy if you're cloning an SVT, otherwise not so much.

    Hope this helps!

  4. #4
    Senior Member Pedro Vecino's Avatar
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    6201 (12AT7) or
    6021 (subminiature)
    ?

    They are different tubes...

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    Yes it contains two 6021, dual triode sub miniature tubes......I have one...I bought it intending to reverse engineer (trace out) the circuit and draw a schematic...so far....being lazy, and having more projects than time, all I've done is play through it and open it up for a peek. Anybody done the circuit trace yet and have a schematic to post?
    Ekatt

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    Thumbs down

    I have abandoned the unit for now. It seems to have problems developing noise after a few months of use. It happened to Me and a buddy of mine. It sounds like bacon it frying w, but with a vial over it.


    FWIW C Smith

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    Quote Originally Posted by elecktrokatt View Post
    Yes it contains two 6021, dual triode sub miniature tubes......I have one...I bought it intending to reverse engineer (trace out) the circuit and draw a schematic...so far....being lazy, and having more projects than time, all I've done is play through it and open it up for a peek. Anybody done the circuit trace yet and have a schematic to post?
    Ekatt
    Hi,

    have you seen any schematics for the seymour duncan twin tube classic?

    thanks,loz

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    Hi there! I have one too and was completely satisfied with it for about 6 month after I bought it, but then some trouble came in. Just out of the blue it stopped functioning and it still doesn't work, though I've replaced the power supply unit, which I thought was the cause of the problem.
    So I really need the schematics for Twin-Tube!!! I'd be SO grateful if anyone could provide me with it!

  9. #9
    Senior Member Enzo's Avatar
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    So with all these folks looking for this schematic, what does Seymour Duncan say when you ask them for it?
    Education is what you're left with after you have forgotten what you have learned.

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    Well, Seymour says "No way!" Probably, because I live outside the US...Anyway, they just won't share that schematic (I've heard about another guy, who tried to get that information from them, in vain).

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    Hi
    I found this with google a few months ago..
    It is the actual Twin tube classic audio section.

    EDIT: Link in this post is dead. Here is link to Post #37 with good link:

    http://music-electronics-forum.com/s...earchid=137703

    Seymore Duncan Twin Tube Classic pedal
    Attached Files Attached Files
    Last edited by Steve A.; 04-13-2017 at 08:22 AM. Reason: Update dead link

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    Seymore Duncan Twin Tube Classic pedal

    Thanx a lot, man! Happy New Year to you

  13. #13
    daz
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    Not to hijack, but i noticed the pedal has a 2.2M ground reference at the input where most amps have a 1M. is there a reason for this? I realize this is a tube pedal, but still. Why the 2.2M?

  14. #14
    Junior Member Robert8192's Avatar
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    Hi all,
    Me too, I wanna trace the schematic and build one
    right away. Why? Because the tube is so different,
    and so small and so cute. Come on now.

    People are complaining that every 6-7 months their
    pedals start up with the scratching sounds.

    This is a pedal with HV on the plates!! Of coarse the
    tubes will burn out- DUH! Quit complaining about the
    pedal and buy new tubes off Ebay already and fix
    the darn thing. Or are you too lazy - or too stupid.

    This pedal sounds great when it it working- That's because
    these tubes are built to much higher tolerances and with
    better chemical treatment and metal composition that
    the good old 12XX7 Line we use. They will still break down though.

    I see the 2.2M resistor in the input to ground also, TWICE..
    Thats probably to make the input even more impedance friendly.

    That's all that is.

    Hopefully my rant did not offend, but as I see it, this
    complaining about this pedal was sort of uncalled for.
    People read this stuff, then they dont buy the pedal, or worse,
    dont build a copy of the pedal. You could modify this
    little preamp for any number of killer apps,

    Robert.

  15. #15
    Senior Member Guitarist's Avatar
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    I commend Seymour Duncan for making these pedals with mini tubes, it's about time someone did! I hope it isn't the tubes, they should be lasting.
    To test, you might just run a aligator clip/cap'd --->guitar chord off of plate V1 and see if your guitar made it through the tube.

    I want the SD Mayhem.

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    My TT Classic also started to crackle after a year or so. Called SD and they recommended to change the tubes. Actually I changed them to 6111's and for my use (bluesish) I like it better now (generally lower gain) Now it can go from a very warm clean to a pretty compressed tube-distortion. Does anyone of you guys have a suggestion of how to voice the thing more "fenderish"? It sounds quite "marshall" now, a bit dark...

    Oivind

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    I wonder if the heater voltages are too high in the SD pedals. For their all rather cool designs in the past, sometimes they get voltage details wrong.
    eg. 9 volts bias on cathode-bias el84s.

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    Quote Originally Posted by xvsop View Post
    My TT Classic also started to crackle after a year or so. Called SD and they recommended to change the tubes. Actually I changed them to 6111's and for my use (bluesish) I like it better now (generally lower gain) Now it can go from a very warm clean to a pretty compressed tube-distortion. Does anyone of you guys have a suggestion of how to voice the thing more "fenderish"? It sounds quite "marshall" now, a bit dark...

    Oivind
    i am also looking to brighten the sound a bit, a bit more treble/bite perhaps.
    any ideas if decreasing the 220 pfcap at input would help or perhaps changing the 4.7 uf bypass caps to 3.3 uf or even 2.2 uf would brighten the tone.

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    Anyone know what the "tonehunter" is doing to modify this pedal?

    Tonehunter - Guitar Tone Customizing & Repair

    Seymour Duncan Twin Tube - Mod 89,-
    More dynamics, better attack, finer gain, more tube tone!

  20. #20
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    I have one too, I LOVE it. it has gotten noisy with time as well. Most likely culprit in tube circuits? tubes. change 'em.

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    Quote Originally Posted by daz View Post
    Not to hijack, but i noticed the pedal has a 2.2M ground reference at the input where most amps have a 1M. is there a reason for this? I realize this is a tube pedal, but still. Why the 2.2M?
    Why not ? 1M is typical and recomended for electric guitar, more is maybe a little better and 2.2M is just maximum for 12AX7 self bias mode.

  22. #22
    Old Timer J M Fahey's Avatar
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    I hope it isn't the tubes, they should be lasting.
    I neither believe in that.
    For God's sake!! they are NOS Raytheon tubes, made for military equipment. Did you see the impact, vibration and G tests and ratings?
    No civilian tube needs to specify that.
    Yea, I know, Korean War vintage, probably.
    What I *do* suspect is that those original connecting wires got somewhat
    corroded in storage and they are not getting *really* soldered, but solder simply cools around them in the solder pad, and sort of crimps (poorly) the wire.
    In a real soldered joint, there is no discontinuity , on one side you have solder (tin/lead), on the other side a different metal (copper, silver, gold, iron, whatever) and between them an alloy is formed, even if microns thick.
    Those pins come "factory tinned" ...... 50 years ago.
    Today I can't solder 1976 vintage MPSA10 transistors or 1986 tinned iron contacts jacks.
    Tin plating doesn't hold well; yet vintage nickel plated jacks *can* be soldered without much trouble.
    I think replacing tubes does simply "refresh" that poor connection .... which won't last long.
    I would "polish" those tube wires with some steel wool or for the real daring, 600 grit wet/dry paper before soldering, and solder them at once.

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    twin tube pop

    I too have a seymour duncan twin tube
    it sounds great on the front end of my fender bandmaster
    when i bought it new, it always bothered me that engaging the high gain channel resulted in a large pop
    i opened it up and found one of the tubes had a lead that was connected
    but had never been soldered, after soldering no more problem.

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    Hey Robert,

    I am playing this with a Fender American Strat. On the Lead setting my Twin Tube buzzes to a very objectionable level when volume and gain are turned up past 5 which is unacceptably loud. I am asking Seymour Duncan for another power supply, but is there another possibility for this problem? Seems to be OK on Bypass and Rhythm settings.
    Thanks in advance for your time,
    Chris

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    My Twin Tube Classic started to do tricks. Both vol pots on the Rhythm channel and on the Lead Channel stopped working. The let the sound through foggy even when rolled to zero.

    When I tweak the Rhythm vol pot to zero with a bit force, it lets all the noice thru. And when I knock the Lead vol pot's knob, it lets all the noice thru, too.

    Obviously I have to change the pots (?). I opened the box and checked them and I surprised: they are not standard looking pots with three connectors but six!

    I have read the schematics but did not figure out, what is the model and type of the mystery pots. Does anyone know it?

  26. #26
    Old Timer J M Fahey's Avatar
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    Post the schematic and a couple pictures; also look at them with glasses (if necessary) and under a good light and post everything is written on them, even if it does not make sense.
    "God helps those who help themselves" .... or something like that.

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    I'm very sad. My entire Pedalboard was stolen outta my car trunk... and my TTC was in there. I will surely be buying another one at some point. I never did fix the noise issue though. Soldering the tube pins did not help and the replacement tubes I bought ended up having short pins for sockets. Never did find where to get replacements... but didn't contact SD either.

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    Quote Originally Posted by J M Fahey View Post
    Post the schematic and a couple pictures; also look at them with glasses (if necessary) and under a good light and post everything is written on them, even if it does not make sense.
    "God helps those who help themselves" .... or something like that.
    ...and the repairman does the rest!

    Next person asking the pots is my repairman if he does not figure them out.

    Thanks.

  29. #29
    Supporting Member Steve A.'s Avatar
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    Thanks for posting the schematic here! I bought one of these several years ago at one of GC's "list events" with it going for about half of list price. When I tried it out in the store I thought that it was a little too aggressive for me but figured what the heck I will just change out the 12AX7's when I got it home. Only to discover that the tubes were subminiature suckers soldered in. Arghh!

    When the TT Blue came out I saw that different tubes were used so I special ordered some from a tube shop in the UK and finally got around to putting them in (after dreading it for quite some time). It was easy as pi the way that SD had the leads splayed out. I liked that the gain was lower but was hoping to run across a schematic so that I might fine tune the circuit a little bit.

    So thanks for posting it!

    Steve Ahola

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    I too would like to see a schematic for the twin tube blue, i wonder if they just changed the tubes or if the circuit has any differences.

    Ive been useing an overdrive pedal to push my twin tube into over drive, i find with a the contour control on my marshall pedal i can dial in a better sound. Any issues to on tube life or circuit problems by not using the gain control of the pedal?

  31. #31
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    Lowell, sorry to hear about your loss there. If you wire up those mini tubes to some power you might have a BETTER sounding pedal. Are you good as fixing pedals? I have a couple here you can have to alleviate your vacuum — a couple Boss that succumbed to Keeley-style modding

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    Really? I'll take what I can get.

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    Yes, of course. Where would you like the barely functioning MIJ Boss Compressor and Distortion sent?

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    I have given up the unit now. This seems to have problems a few months after development and utilization of the noise. It happened to me and one of my partners. It sounds like it fried bacon watts, but the top of a vial...
    Charming Ladies black leather Platform Shoes and that's really beautiful

  35. #35
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    Hello Steve, do you still have a copy of the schematic for the twin tube classic? The link on this forum doesn't seem to work anymore. Thanks

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