The best Jfet clean preamp?

[meffcio]

Well guys, here's the story. I'm building a DIY solid-state 2-channel amplifier. It will contain Dr Boogie as the heavy channel, B.Blender or ROG Splitter-Blend as an fx loop (btw. which one of those two is better?), and of course a clean channel. But wait... which one? I was thinking of using Fet-2B (alembic), but it is meant to be used mostly for bass guitar. I was also thinking of using Professor Tweed, but it has only one tone control. Are there any other and maybe even better possibilites?
Thanks in advance,
Meff.

[Quackzed]

you could add a full fender tone stack to the professor tweed... or even find a shem where someone added one to their own build if that is the only reason against..
how clean do you want to be able to get?
if you want a lot of headroom (so you can use pedals in front of it) you might go with a clean boost like a mini booster or any circuit that has little to no distortion untill you really slam it with a booster or overdrive stompbox.
if it has a bit of overdrive with a strat at low settings on its own, youll never het a clean sound out of it with hot humbucker equipped guitar...

[anti-idiot]

This one maybe:



http://www.redcircuits.com/Page120.htm


Or this other one:



Soundclips:

http://diyfactory.ru/images/stories/files/Clean1.rar
http://diyfactory.ru/images/stories/files/Clean2.rar
http://diyfactory.ru/images/stories/files/Clean3.rar

The source (i hope u know russian)

http://diyfactory.ru/index.php?option=com_content&task=view&id=89&Itemid=47

[arawn]

Damn that fet twin sounds really good to bad I can't deciper the cyrrilic stuff on the scheme

[anti-idiot]

Damn that fet twin sounds really good to bad I can't deciper the cyrrilic stuff on the scheme

Basically:

use 24v (or at least 18v)

http://babelfish.yahoo.com/translate_url?doit=done&tt=url&intl=1&fr=bf-home&trurl=http://diyfactory.ru/index.php%3Foption%3Dcom_content%26task%3Dview%26id%3D89%26Itemid%3D47&lp=ru_en&btnTrUrl=Translate

http://freestompboxes.org/viewtopic.php?f=28&t=6462

[meffcio]

you could add a full fender tone stack to the professor tweed... or even find a shem where someone added one to their own build if that is the only reason against..

Well, I'm pretty sure I saw Prof. Tweed with 3 band tonestack somewhere, but I think this layout was old and unverified, and somebody said he'll check it sometime. But yesterday after starting this topic I thought that I don't need 3 band tonestack that much. It would be REALLY nice, but it isn't necessary. But there goes another problem..

how clean do you want to be able to get?
if you want a lot of headroom (so you can use pedals in front of it) you might go with a clean boost like a mini booster or any circuit that has little to no distortion untill you really slam it with a booster or overdrive stompbox.
if it has a bit of overdrive with a strat at low settings on its own, youll never het a clean sound out of it with hot humbucker equipped guitar...

I want to be able to get clean tones. If there's a possibility - clean to crunch. And hearing the PrT samples - it sounds really ovedriven, but it's used before other amp's clean channel, BUT it's recorded with a strat, and I have humbs. PrT has a power tube also 'jfeted' in it... But using it not before a normal amplifier, but only a poweramp, I think I could get what I want?
I'd also like to use Red Ranger Booster or Distortus Maximus (unity gain) before the preamp sometimes.

This one maybe:
http://www.redcircuits.com/Page120.htm

Or this other one:
The source (i hope u know russian)
http://diyfactory.ru/index.php?option=com_content&task=view&id=89&Itemid=47

Well, in fact I was the person to mention them in the topic on the other forum But I forgot to mention them here. Anyway, too big voltages. I want to use 9 - 12V, because I already have a power transformer which I'll be using.
The second problem, about first cheme - I suck if it's about making PCBs from the schematics. I just can't do it.
And nope - I don't know russian.

Damn that fet twin sounds really good to bad I can't deciper the cyrrilic stuff on the scheme

Sry for advertising..
http://....org/viewtopic.php?f=28&t=6462
There's a PCB out there, and some informations.

[EDIT]
What about this?
http://i24.photobucket.com/albums/c22/umafloresta/FX/RunoffGroove/SuperBassmanumble.png
It's umble made to recreate the bassman specs.

[Auke Haarsma]

Anyway, too big voltages. I want to use 9 - 12V, because I already have a power transformer which I'll be using.

you could use a simple voltage doubler to get 20V+ out of your 9-12V.

[meffcio]

you could use a simple voltage doubler to get 20V+ out of your 9-12V.

Example? I know about the MAX1044 IC, but it's unavilable here in Poland.. Oh no, wait, it is avilable. One guy an allegro (kinda polish e-bay) sells it for enormous price..

[jimosity]

Sry for advertising..
http://....org/viewtopic.php?f=28&t=6462
There's a PCB out there, and some informations.

Are you referring to a PCB for the FET Twin??
Your link here doesn't work - can you fix it or PM it to me - I'm really interested in the FET Twin and if a PCB already exists, that'd save me a lot of trouble.

[bobp1339]

f r e e s t o m p b o x e s .org

You can use the BF245 FET in place of the Russian FETs... I use the BF245 in my clean boost and my distortion pedal and they provide a nice sound...

[jimosity]

Would the 'Double Chip Doubler' get it enough voltage to work?
I would hate to have something other than a 9vdc power supply for this guy.

[meffcio]

Are you referring to a PCB for the FET Twin??
Your link here doesn't work - can you fix it or PM it to me - I'm really interested in the FET Twin and if a PCB already exists, that'd save me a lot of trouble.

As bobp1339 said, it's http://www. f r e e s t o m p b o x e s .org/viewtopic.php?f=28&t=6462
Yes, censorship sucks.

Anyway, anybody knows is Professor Tweed or Umble with bassman mods capable of clean tones as a preamp?

[MikeH]

Most of those ROG preamp type designs are designed to provide nice distortion, not necessarily clean tones.  Somewhere there was a schem floating around of a FET design based on an Orange 100 which would was said to be really clean.

[meffcio]

Most of those ROG preamp type designs are designed to provide nice distortion, not necessarily clean tones.  Somewhere there was a schem floating around of a FET design based on an Orange 100 which would was said to be really clean.

Actually couldn't find it, only some fuzz pedal based on one of Orange's amps..

[solderman]

you could use a simple voltage doubler to get 20V+ out of your 9-12V.

Example? I know about the MAX1044 IC, but it's unavilable here in Poland.. Oh no, wait, it is avilable. One guy an allegro (kinda polish e-bay) sells it for enormous price..

Here's a good site with a lot of tone stacks http://amps.zugster.net/articles/tone-stacks
MAX1044 are available at http://www.banzaieffects.com/ for 3.15 €

[ELS122]

Damn that fet twin sounds really good to bad I can't deciper the cyrrilic stuff on the scheme

well basically the transistors are KP303G and in the output KP303A

if you still care 10 years later...