FET emulation of EL34A power amp section

[lenwood]

Does anyone have any ideas as to how this can be done? or have any further info. I understand the emulation of tube amp preamps. just looking for some more that would be benefit others here also.

thanks in advance guys.

[Alpha579]

Well, you could just use a couple of J201's in a push pull stage, following a phase splitter...What i was wondering, is there a way to condition these Jfets to mimic there valve counterparts better?

[Paul Marossy]

I personally think it would be hard to convincingly imitate a tube power section because of the differences in the levels of harmonic distortion between a tube and a SS device. It would probably be close enough that the average Joe wouldn't know, or probably even the average musician.  

[petemoore]

There was a recent thread about this.
 Other things mentioned in addition to..
 Highly variable ohmage/Speaker influence on loading  the amps output section.

[Paul Marossy]

One other thing I forgot to mention: "warmth".
As I mentioned earlier, one of the biggest factors cited for tubes sounding different than SS devices is caused the amount of harmonic distortion in each even and odd order. What people call "warm" is actually harmonic distortion at many different levels - for example, 2nd order, 3rd order, 4th, 5th, 6th, 7th, and on and on. The other big difference between tubes and SS devices is that tubes is that tubes have a very strong 2nd order and 3rd order harmonic in comparison to a transistor which has predominantly 3rd order and very little of anything else. Tubes have more going on in the even and odd orders. All of this contributes to what the human ear perceives as sounding warmer. So, that being the case, I guess I like harmonic distortion!

If this is interesting, read more here: http://www.dwfearn.com/tvst1.htm
This is a very interesting article comparing tubes to SS.

[Travis]

With something like the 12AL8 available (at 2 bucks and change), not to mention those really low output 12V power tubes, I don't see why you would need the FET emulation for this.  

I've built a couple of pedals and amps around some of these, and the sound is HUGE.
(drawn from list originally posted by Peter Snowberg)

Check:
12AL8    triode/SC tetrode 40 mW
12DK7   twin diode, power tetrode, 10mW      
12DL8   like a 12K5 + dual diode      
12DV8    dual diode + AF tetrode 5 milliwatts      
12EM6   tetrode + diode, 10mW !      
12FR8   triode + diode + pentode      
12J8   dual diode + power tetrode, 20mW!      
12K5   35-40 mW SC tetrode !      

I think that's all of them.

The 12AL8 is my favorite right now.  It can drive a speaker at conversational volume, and sounds like a stack on the verge of breakup when mic'ed properly.  

I've been experimenting with different ways of setting up the output in pedal form, and the best sound (for me) still comes with a transformer.  I would love to find something a bit more cost effective.  
   
http://www.diystompboxes.com/sboxforum/viewtopic.php?t=22194&start=0&postdays=0&postorder=asc&highlight=12v
And
http://www.sopht.ca/index.php?s=26

edit: Maybe the low end isn't as important when not driving a speaker.  I need to try this with one of those wee Radioshack trannies.

[Paul Marossy]

I've been hearing so much about these mini tubes lately. I ought give it a try...

[petemoore]

6AU'x'  [6?]...I have one of these, can't read the last cenomination character...wondering about this one...any ideas what it is or could be used for?
 12at7's
 12AU7...
 I found these in a box, the AT, and AU, I believe they'd plug in where a 12AX7 would,