New tube preamp pedal

[electrictabs]

Well I call it a hybrid since I copied two schematics in order to build this one
The Professor Tweed from the guys at R.O.G.(sorry I used your schem, I don’t have any good software for drawing circuits :-)  ) and Aron Nelson’s Shaka Tube (basically I copied the power supply)…
  I tried to build some tube preamps as the shaka tube, tube driver,etc in order to achieve a nice sparkly clean to blues tone but I thought that the sound was too op amp thingie for me. That was because the tube was not creating any of the overdrive the way it was placed just some compression…Some months ago I built the Professor Tweed and I liked the sound so much. It was to close to tube sound . Last night night I thought that if I replace the first two fets with a 12AX7 then the overdrive coming out will be even more tubish (there’s always the fet that contributes to the overdrive).So I did. I kept a fet in the last stage but I replaced it with a J201. You can use the types that Professor Tweed originally used but that’s personal taste…
  The sound is great even at low volumes.You get that tube amp breakup that is great for blues but also clean sounds (if you roll down the volume pot from your guitar or the circuit’s gain/volume pot). It is very sensitive to your playing that’s what I like most…
  If you build it let me know if you like it
  I’m wondering would this sound good at other R.O.G. like simulators???Just like using valves at all stages not fets and at 12V AC

[electrictabs]

here's the schem
http://homepages.pathfinder.gr/mp31/Tweedy%20II%2EGIF

[electrictabs]

oh i forgot right click+save target as

[StephenGiles]

I get "this is not a valid gif file"
Stephen

[electrictabs]

it works ok now

[electrictabs]

note that drain trimpot should be adjusted for V+/2

[petemoore]

I see you kept the 100k trim on the second [tube] stage, but not the first!
 At What voltage are you running the tubes? [not the heaters]
 Looks pretty cool !!!

[electrictabs]

sorry the second trimpot does not exist it is just a 100k resistor
i fixed that in the schematic
V+  =16V
sorry i couldn't put the power suplly in the schem use the shaka tube power supply as stated above

[nero1985]

the tubes need 16v to work???, can i use two 9v batteries in series to make it work??

[Paul Marossy]

can i use two 9v batteries in series to make it work??

Yes, you could, but your batteries would only last a 3-4 hours...

[Peter Snowberg]

Very cool!

That's the first time I've seen a tube used to overdrive a JFET.  

[Marcos - Munky]

Very interesting. Soundclips?

[petemoore]

the tubes need 16v to work???, can i use two 9v batteries in series to make it work??

Find old printers PS's, they often run at 30vdc, which is very convenient, except you have to lug that "Floor Wart"...or shorten and lenghten the DC and AC lines and go chassis mount [large chassis...]or external.

[electrictabs]

thanks guyz soundclips coming soon

[joshwatson]

also some pics of your circuit or the inside of your pedal would be cool, what size enclosure are you using?

[evertonberger]

Hi, I am wondering if I can altered the circuit like flipster of ROG in the same way you do with professor teewd??? sorry my english is bad... but what I want is to put a valve on the 2 first stages of flipstar I can do this copying your style...??
Some help here
Tweedy soundclips???

[petemoore]

  These amp emulators [mostly?/all?] are taken fromtube amp schematics of popular tube preamps, converting them back to tube...but at 'starved plate' voltages should work for any of them, and as always, YMMV.
  I decided to sans the PS and just use a 30-36vdc Wall Wart from a printer for Shaka T builds...quick/easy, seems to work well.

[brett]

Way cool !
How does the sound change with B+ voltage?  Does 30V give extra headroom compared with 16V? 
I still can't quite believe the 16V thing. 
cheers

[RLBJR65]

Looks cool! But I am a bit confussed. The Shaka Tube PS is a dual supply V+  and V- . As I recall with a 12V transformer my Shaka PS is roughly +14 -14 loaded. It was more like +17 - 17 with no load. Are you using just the V+ and ground or maybe a 9V supply?

[evertonberger]

Hi people I again hehehe
I have some questions I can use the first 2 valve stages at High Voltage and the filaments and the rest of the circuit JFETS at 12V?? 
I have to do any modifications in the signal path to do this??
I will begin the project realy son but I use the bassman schematic to do this
HELP wanted
Sorry my english is very bad
but thans for any help