Greatest circuit ever (or weirdest)

[Michael Koster]

Originally posted by Wavebourn
I have nothing to brag;
just an ordinary pentode on MOSFET steroids:

http://www.diyaudio.com/forums/attac...amp=1241463993

Great! You could probably use a variation of the garter balancer with that.

What happens with screen current?

Michael

[Wavebourn]

Originally posted by Michael Koster


Great! You could probably use a variation of the garter balancer with that.

What is garter balancer?

What happens with screen current?

As usual, I use it in an opto-compressor.

That thingy drawn gave me 300W with 170V B+ driven by a plain and easy Concertina splitter.

[Wavebourn]

Originally posted by Zen Mod



Papa patented that

One more path in the forest had been named, and a fee paid to protect it from free usage by other people.

[Michael Koster]

"That thingy drawn gave me 300W with 170V B+ driven by a plain and easy Concertina splitter."

Oh, class AB. Yeah, these things work fine in class AB. But the balancer
is for class A I think. Maybe the balancer plus the cathode clamp...

"One more path in the forest had been named, and a fee paid to protect it from free usage by other people."

One more piece of poop legally documented, labeled, and classified! Watch
out!

A patent used to be a good thing, protecting the poor inventor from being
ripped off and exploited by bigger playground bullies. Now the bullies have
taken over the patent system and use them as sticks. You have to get
patents in your own defense.

I say it should go like trademarks, use it or lose it. Except no 100 year
extensions like the one they did for Mickey Mouse.

[Zen Mod]

boyz , I didn't wrote Monster ...... I wrote Papa ;

that's big difference , in all areas .....

[Wavebourn]

Honestly, I am glad that the poo...sorry, patent had been granted to Nelson, a smart experimenter.

Could be worse...

[Michael Koster]

So in this case it is protecting the inventor from corporate bullies,
and the invention is being used in the inventor's products.

Also without a citation it was hard to tell... I'd like to look it up.


Michael

[Zen Mod]

Originally posted by Michael Koster
So in this case it is protecting the inventor from corporate bullies,
and the invention is being used in the inventor's products.

Also without a citation it was hard to tell... I'd like to look it up.


Michael

go here : http://www.pat2pdf.org/

look for 5343166

[Michael Koster]

Originally posted by Zen Mod



go here : http://www.pat2pdf.org/

look for 5343166

Interesting!

But the only things in common with the circuit I published are it's
use of a cascode and a parallel circuit path for bias current.

I should explain the circuit operation a bit more.

The device above is an active current mirror for the current in the
vacuum tube, and optionally provides a fixed elevated cathode bias.
The circuit has 1/2 the Rp of the tube alone and 2X the gm for
equivalent mu.

The objective of the circuit above is to enable the use of high
impedance tubes like the 801A with "reasonable" output iron,
and resulting in a "reasonable" damping factor. It's basically
a substitute for 2 tubes in parallel.

I don't know of a circuit just like that one, but it wouldn't surprise
me if it had been done in the 1960s.

Cheers,

Michael

[Wavebourn]

Originally posted by ErikdeBest
Hi Anatoly!

Go, switch on the barracuda!!

Just to see if I got it: current through the 12L6 will develop a voltage over R6. Substract the voltage drop of the mosfet (about 4V?) from the voltage over R6, and divide the obtained value through the amount of current desired through the mosfet, to determine R8.

R5 is used to provide the cathode-bias, R7 to measure standing current...

You got it right, Erik.

Also, R7 is needed for better stability of idle current.

Now, guess why 170?

Edit: no, it was not Barracuda I was afraid to switch om... It was a Pyramid 7 modified. As I was afraid of, it started oscillating on 300 Khz, and I am going to revert it back...