No prob.  :tu:

Here's a place that sells them. http://uk.farnell.com/semelab/alf08np16v5/mosfet-audio-np-ch-160v-8a-to-247/dp/1856771?Ntt=ALF08NP16V

I think their ALFET line is pretty new and not widely distributed yet. There site, http://www.semelab.com/magnatec/alfet.shtml , actually says the single package version is still in devolpment. I wish I could just look these up on Mouser and order. (and I wish my wife wouldn't give me sh*t about spending $$$ on my hobbies)

The only prices I can find are in British currency.

N and P channel lateral power mosfets in a single package.

http://www.semelab.com/pdf/magnatec/ALF08NP16V5%20ALF08NP20V5.pdf

Ok, I take back the "preaching to the choir" thing. You're retelling why the drain biasing scheme is lazy is still interesting, and you've added a little extra insight. Good stuff.

Quote from: J M Fahey on February 11, 2011, 07:32:12 AM
Dear Rowdy.
I'd love to clarify my position.
Let me use your Sports analogy, which I find interesting.
I do not see myself as a Pro Football player laughing at a High School team; that would be a totally useless (and childish) attitude and would not help them at all.
Rather consider me an old, grumpy, seasoned Trainer, yelling "c'mon guys ... faster .... faster ... catch that ball ...  run ... show your training ... don't be lazy !!"  :trouble and so on.
The drain trimpot "solution" *is* being lazy, there's no other way to put it.

Ok, that's fair. Sorry for taking it the wrong way. As for the rest of the post, it's preaching to the choir.  :tu:

Absolutely agree. One of my favorite circuits, the Dr. Boogey, sounds pretty good, but I hate how it too uses a trim pot for the drain resistor to adjust the bias. This makes the problem with variation in FETs even worse. I've been toying with a variation using trimpots for the source resistor instead. Don't know if it will be much better, but doing so might give more consistent results. Obviously still not as cool as your biasing scheme, but with my time and resources, I've got to stick to simple.  Simple might be ok for the Dr. Boogie concept anyway. I don't know that it is as critical in that circuit that the jfets clip just like tubes.

Some time in the future, though, I might try to build one of your designs. The sound samples sound bad ass!!!

Quote from: J M Fahey on February 08, 2011, 12:03:54 AM
I am not quite loved in some Forums because...

I hope you're not confusing disagreement with dislike.  Of course, I can only speak for myself in saying I do not dislike you at all. I think you pretty much rock.

Quote
I always state that the ROG approach of taking a "Famous" circuit , ....

I've always agreed about your criticism of ROG and others FET biasing schemes. It just seems to come across as a bit smug when you do so rather than as giving constructive criticism. Of course, I could be totally misreading the attitude in your criticism. You're obviously an electronics bad ass. I think the guys at ROG definitely know a lot more than your average hobbiest, but they're certainly not in the same league as you or KMG or Teemuk, etc. So when you're hard on the ROG guys, it almost sounds like a professional athlete talking trash about how a high school football team sucks. Or maybe a physicist telling an elementary school kid that he sucks at math. Once again, I might be totally misreading the intent behind your criticism.

I've thought about doing silk screening, but I've never needed to do enough boards to justify it.

Quote from: joecool85 on February 08, 2011, 02:18:21 PM
I always hear people recommending to use Press 'N Peel blue.  You can get it from SmallBearElec.com for only $2 a sheet.

Since you asked for a homemade solution, I would recommend using paper from a magazine.  Not the covers, but the thin inside sheets.  I haven't tried it myself, but evidently is transfers the toner very well.  You just soak it in water after the ironing to get the paper off and you're done.

Press-n-Peel blue works pretty well for me.

Quote from: mensur on March 05, 2008, 01:20:03 PM
I found that too guys few days ago, but we will see.Can we make Jackhammer PCB?Lets ask someone who has it, to picture th PCB(from both sides).And than make the MG PA.

Are you still interested in the Jackhammer PCB images? If so, I'll try to take some pics tomorrow, but it probably really doesn't sound any better tan the GV-2. In fact, I really don't like the sound that much without putting an eq in front of the Jackhammer.

Quote from: Steve Conner on February 04, 2011, 11:00:48 AM
No. It does it on purpose, because I stuck some resistors from drain to gate.

See this article for why I put the resistors there: http://www.radiomuseum.org/forum/the_trioderizer_a_solid_state_triode.html

They also help the LND150 to bias up hotter than it otherwise would, especially since it needs resistance in its source to bring its gm down in line with a 12AX7.

Duh!! I thought you were talking about leakage through the gate.  :duh

Quote from: Steve Conner on February 04, 2011, 10:34:33 AM
The major drawback is that it leaks DC out of its "grid".

Do you think the gate insulator might be damaged?

Wow, I like the sound samples.