Tube Amp Archive

As a baby boomer I think I was taught a lot of values lost on the younger generations. It's a busy world these days and teaching kids to respect others seems to have been lost in the shuffle. I'm only 38, but I wasn't raised to be as disrespectful as much of our younger generation has become. A lot...

a) the 50+50 in PARALLEL makes 100uF. That pair in SERIE with another pair makes HALF the capacitance so 50uF total b) a bridge recto like that gives 350VCT * 1.41 = 494VAC, so about 480V at the B+. Historically, marshalls used 450 to 500V filter caps which is borderline for a ~500V B+ (especially a...

IMO each amp has it's "favorite" MV and/or attenuation scheme. An attenuator is the most "portable" generally speaking. So one attenuator fits most if not all amps while a MV must be designed to fir within the "tone recipe" of a given amp. The trainwrecks are quite stage to stage interactive so powe...

Ooooooo. Definitly going in my next build

I think that mustard indeed are polyester but for express it's polypropelene that should be used if I'm not mistaken.

Read Randall Aiken Tech page about the schmitt splitter. I think he even has the original article on his website.

novosibir wrote:

Jack wrote:And still, for the price these devices are, you can afford to hook them backward

Impossible with tubes... they won't fit upside down into the socket

Larry

Well with an old broken NOS socket, anything is possible

Do you concord owner perfer the fast or the grad mode?

For 6.3V DC, the simplest approach is to use a 10A bridge and a 1000-10000uF cap. The voltage gain by rectification is compensated by the voltage loss in the diodes and the filtercap. On the marshall JCM900 SLX, that's what they do and it gives a 6.27 V IIRC. If you worry about regulation, get a fu...

Dumb questions:

Do you have a hi-cut control?

When you mean clean power and drity preamp, do you mean unscaled preamp and scaled power amp?

Buzz/fizz is usually due to too much gain in the highs and squarewaving.

For 6.3V DC, the simplest approach is to use a 10A bridge and a 1000-10000uF cap. The voltage gain by rectification is compensated by the voltage loss in the diodes and the filtercap. On the marshall JCM900 SLX, that's what they do and it gives a 6.27 V IIRC. If you worry about regulation, get a fur...

mhuss wrote:[
Good point -- it doesn't really matter, except for the confusion around those confounded diode and transistor arrows.

--mark

And still, for the price these devices are, you can afford to hook them backward

In the post above the one you quote, I explain what happen in the DC case.

At the end of the wire, the electron leaves the wire to the next component (a solder pad, another wire, etc) replaced by a new one that enters at the other end (DC case).

Additionnal technical precision: The electrons do not actually leave their "orbits" since the "orbit" is an hybridized orbit involving all the atoms. So in a sense, they leave "their atom" but not the "orbit" which, in a metal or semi conductor, is rather called a "band". They do not leave the band ...

I have these vague recollections about all of this: Benjamin Franklin was the idiot who decided that the election would have negative charge. In conductors and semiconductors, electrons don't actually flow. It's more like they wiggle and are not stripped away from their nucleus's. Yes, they do. An ...