Sounds amazing! The schemo OTOH looks like a mace...
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Show posts MenuQuote from: J M Fahey on December 29, 2010, 04:10:16 PM
Hi tchrist.
I'm not "clashing" with our friend teemu's opinion (far from it), because I simply didn't even *look* at the "small" Fet amp, just went straight to the "big" one, where I saw no curve bending, bias shifting, etc. at all, at least in the scope images posted by the author.
All I saw there is a little top rounding, *very* easy to get by far simpler means.
And the "tube artifacts" are generated in a far better way by the excellent Transtube circuit.
Maybe driving a real world speaker things change.
Differences of *opinion*?
Sometimes yes, and that's good, or the World would be quite boring.
If you can get that transformer wound for such a low price, and build the amplifier, go for it, and post results here.
Happy Xmas and New Year to everybody, y felices fiestas para ti.
Quote from: J M Fahey on December 29, 2010, 05:31:52 AM
Hi tchrist.
Those are interesting ideas, very experimental and quite far from a finished product.
Not bad as a concept, but the waveforms he shows are SS type , not tube type, so the main object of getting so complex and expensive (just ask for a quotation on his output transformers) is not achieved.
No te rompas la cabeza contra una pared.
Just build a tried and true chip amp, from 5 to 150W; *or* a real tube one; again from 5W to 100W, and experiment with the preamp, stomp boxes, etc.
Good luck.
Quote from: phatt on December 29, 2010, 07:52:50 AM
Hello tchrist,
Not sure where your heading but I agree with JM Fahey's last post. 8|
That stuff is Way to complex for little benifit as a tube power stage will still be better.
I did have a listen to the clip, Turning the knobs did little to effect any real change in sound.
Also a servere lack of bass but that's a matter of taste.
A note on tube preamps ,, it's a dog chase tail thing as the real benifit of Valves is in the power stage not in the preamp stages.
So if you want to throw money at something then build a Valve power stage and leave all the tricky complex preamp stuff for SS. Cheaper and Easier to fault find for the hobby types.
These days anything with an AX7 inside a preamp will sell.
IME, Complex valve preamps are no better than what can be done with transistor/chip circuits.
Sure if money is no object then go nuts but the cost is significantly higher with Valves.
Phil.
Quote from: teemuk on December 29, 2010, 07:34:19 AM
I don't know... to me at least the MicroPA output looks pretty much like one coming from a generic tube amp: somewhat rounding up on the clipping onset and it even features the same type of crossover/blocking distortion mechanism due to shifting bias point. But, I think those scoped waveforms are either from running to a resistive load or the amplifier's response stays fairly linear regardless of load impedance. So the mechanism where amp's gain interacts with a reactive load is not showing up in there. Otherwise, it pretty much nails the "PP tube power amp thing".
Quote from: Krank on March 03, 2010, 01:06:19 PM
I knew that but I've tried really hard and can't find that schematic anywhere, could you please help me?
Quote from: Zappacat on October 28, 2009, 01:37:16 AMQuote from: THChrist on October 11, 2009, 01:20:48 PM
Hello everybody!
I wanted to bla bla bla
I was really excited about seeing this schematic until I got to the "page not found error" on photobucket. Why not post it here?
Quote from: J M Fahey on June 26, 2009, 01:17:01 AM
Hi THChrist. Good for you. You can upgrade your amp anyday you like. Start with something good and simple, enjoy it, and in the future add what you want. The problem with speakers is that most available (besides expensive specialized guitar speakers) are built as Hi Fi woofers, or even worse, Car Audio. Low efficiency, muddy sound, the works. ¿What do you have available in Peru? You should look for "extended range" speakers, nor woofers or worse, subwoofers, no rubber or foam borders but plain paper ones, etc. Maybe the Selenium 12PW3 is available there, it´s acceptable as a guitar speaker.