The Amp Garage

In. Should be some interesting reading.

But now I can't click on those links and read the thread. you get the below image correct? if so you can just copy past the link in the body, annoying but is what it is. the google warning pretty much screams run away, anyone new searching google will do just that. I'm guessing we all pretty much g...

Me and the site's search engine are just not good friends. It seems searching from google with a TAG tag produced better results. But now I can't click on those links and read the thread.

sepulchre wrote:Still getting the warning from Google. I haven't been here in a long while (insane work hours) and wondered what was up. Hope you guys get that warning down.

I get a warning anytime I click on a link to TAG from google. I don't even have the option to go anyways.

Ah, thanks Roberto.

Wouldn't all three be a local feedback circuit then? And I assume they would be negative feedback, right?

I tried to search but wasn't sure what they are called, so nothing came up. This was posted in the fender forum, and I've seen them in other circuits as well. http://ampgarage.com/forum/download/file.php?id=41581 V1B, V4A and V4B all have resistors (rather large value) and capacitors bypassing the g...

from "Design and Construction of Tube Guitar Amplifiers" by Robert Megantz, on page 85-86 for anyone that has the book. It is discussing the reverb driver circuit of a typical fender type reverb. The parallel 12at7, transformer coupled (22.8k primary), 2.2k cathode resistor. It has a picture of the...

Yeah, Blencowe's book has so far been the standard to which others are compared. I really wish he'd do a power amp book. I'd buy two. I'm just reading all I can get my hands on now. Megantz is the current one. It's not bad, but not "complete". There's been a few times I've had to stop and say, "wait...

Ah, right. The working load line wouldn't be as steep a slope because the AC impedance would be greater. Thanks! So what is Megantz's reasoning for just shifting the original load line straight up by 3.7mA and keeping operating point right at the supply voltage? I wished he would have went into more...

Thanks Martin. That makes a little more sense and that method for finding the operating point is the one I'm familiar with from the Merlin book. The final result from the Megantz book has the second load line ending at 415V at 3.7mA, with the operating point being there at -8V. I couldn't figure out...

Sorry guys, I guess I've not been clear. The 3.7mA and -8V are unknown values. The known quantities are 415V supply, the 2.2k cathode resistor, and the 22.8k primary. He draws a load line at 0 mA 415V and 18.2 mA 0V. He then states the tube isn't operated a max dissipation so has to find the "actual...

Thanks Phil

How did he come to the conclusion 3.7mA was what was flowing through the tube (and thus the cathode resistor)? This is where I'm confused. He just states it and didn't go into detail how he arrived at that conclusion.

from "Design and Construction of Tube Guitar Amplifiers" by Robert Megantz, on page 85-86 for anyone that has the book. It is discussing the reverb driver circuit of a typical fender type reverb. The parallel 12at7, transformer coupled (22.8k primary), 2.2k cathode resistor. It has a picture of the ...

The 1x2 is the length of the baffle, (or longer). The corners I cut, and fold the side over. Once the top-bottom is tensioned, and stapled, all that is needed is to tighen the sides enough to remove any slack. I'm going to try it again this weekend. I've cut another baffle...I'll just use whichever...

Thanks Bill. Is that 1x2 a long piece that covers the length of the baffle? I thought about doing something like that, but then wasn't sure how to get the sides tensioned up that way. What techniques do you use for the corners? Two cuts parallel to each edge at the end of the board? I've got black g...