MASantos Posted April 22, 2009 Report Posted April 22, 2009 Looks great! Too bad I won't listen to any of these new amps before 2011...
Dusty Chalk Posted April 22, 2009 Report Posted April 22, 2009 (edited) Ponzi scheme?I mean, easier, legal way that doesn't require loss of domicile and acquisitions. And more patience than I have. Besides, I thought it was Ray's amps that burned things down, not Mikhail's...?Fling crack rock. Crap I mean sling.That's okay, I didn't understand either one....trust Dusty...Thanks, there's my slogan right there... Edited April 22, 2009 by Dusty Chalk
kevin gilmore Posted April 22, 2009 Report Posted April 22, 2009 Why use the 6CA7 again? I don't follow. not the PA42, but stumbled upon plenty of these for beans: http://focus.ti.com/lit/ds/symlink/3583.pdf I was more curious on how it compares to the AC coupled amplifier. If you are going thru all the trouble to make an all dc coupled all tube amp, then you might as well scale up the output tubes to handle more voltage and power. Those 3583's went out of production 10 years ago.(probably more than 10 years) If you can find them dirt cheap, then give it a go. You will need sockets for those parts which may be hard to find. You might actually have better luck using DHT's for the outputs, as the gate voltage will be much less... Also remember that this lifts the output voltage to +300 dc. Which means the bias is is now +850 dc. Some people seem to get a bit nervous with that...
Jon L Posted April 22, 2009 Report Posted April 22, 2009 the two power switches are for each side, left and right channels??? also he should take the glass off and use it like a shield for on the tube sockets like the b52 has, Looks like one power switch is for "stand-by" mode, and the glass is removable. ----------------------- * Removalbe glass panel * More to come... * From a cold start, the dual power switch protects the tubes from a high current surge. Turning on just one of the power switches provides low voltage to the heaters while the unit remains in stand-by mode. Turning on both power switches allows the unit to function properly. ------------------------ I'm kind of digging the side view. Did Jack confirm this amp will make it to CanJam?
luvdunhill Posted April 22, 2009 Report Posted April 22, 2009 (edited) Also remember that this lifts the output voltage to +300 dc. Which means the bias is is now +850 dc. Some people seem to get a bit nervous with that... interesting idea. Seems that you'd be running the opamp very close to its limit. Here's another interesting one: http://www.mskennedy.com/client_images/catalog19680/pages/files/131r-.pdf Even lists electrostatic transducers as a typical application. Datasheet is prelim though, but at least it's a new production device. Wonder if I can get "samples". Looks to be a pretty impressive little device. Edited April 22, 2009 by luvdunhill
spritzer Posted April 22, 2009 Report Posted April 22, 2009 I just realized something, this amp looks a lot like the first Stax SRM-T2 prototype: LOL @ "arcy sparky". That's simply brilliant! Perhaps the Stax mafia should change it's name to the Arcy Sparky brigade. Ps. This brings back ford memories of yesterday afternoon when I watched 2000uf@350v explode a few inches in front of my face, messing up my vision a bit and burning a hole in my table. Also remember that this lifts the output voltage to +300 dc. Which means the bias is is now +850 dc. Some people seem to get a bit nervous with that... Blah, wimps!! Just replace the air inside the drivers with some of the stuff Dayton-Wright used and we'll be fine.
kevin gilmore Posted April 22, 2009 Report Posted April 22, 2009 Blah, wimps!! Just replace the air inside the drivers with some of the stuff Dayton-Wright used and we'll be fine. AH HA... stink gas... sulfur hexafluoride I had a pair of those a long time back. motorola piezo tweeters inside the air bags. As i remember the gas gave about a 5db gain boost. mskennedy... you kidding right.... those are military boys. their prices are 3 times that of apex...
spritzer Posted April 22, 2009 Report Posted April 22, 2009 They were really ahead of their time with that gas idea. Soundlab is just catching up with their teflon coated diaphragms. So.... if we used those chips then the amp would be mil-spec? Sounds like a plan!!
bhd812 Posted April 23, 2009 Report Posted April 23, 2009 You're a lolcat, aren't you? Iz part ov teh itteh bitteh kitteh committeh! Looks like one power switch is for "stand-by" mode, and the glass is removable. ----------------------- OMG it has a stand-by switch! thats so money! I remember speaker tube amps having those also..thats badass. keep the bad boy warmed up then full blast only when in use..
luvdunhill Posted April 23, 2009 Report Posted April 23, 2009 mskennedy... you kidding right.... those are military boys. their prices are 3 times that of apex... can you get some?
catscratch Posted April 23, 2009 Report Posted April 23, 2009 Can't comment on any technical aspects of the amp obviously, but I do like the look/design a lot, especially the power supply. It's simple and classy, not overblinged like a certain amp builder's stuff. Now I'm just waiting for (or dreading more likely) the final price.
kevin gilmore Posted April 23, 2009 Report Posted April 23, 2009 can you get some? Certainly. But i'm not giving them to you..
Smeggy Posted April 28, 2009 Report Posted April 28, 2009 I'm not sure I like the bullet proof shields on it, other than that needs more black and gold.
The Monkey Posted April 28, 2009 Report Posted April 28, 2009 I'm not sure I like the bullet baby monkey-proof shields on it, other than that needs more black and gold. Some of us need to protect our amps from those meddling kids.
Smeggy Posted April 28, 2009 Report Posted April 28, 2009 Some of us need to protect our amps from those meddling kids. That's why they invented stair closets
luvdunhill Posted April 29, 2009 Report Posted April 29, 2009 You will need sockets for those parts which may be hard to find. Found some sockets for the Brown Burr op-amps. $27 each though ...
guzziguy Posted April 29, 2009 Report Posted April 29, 2009 Found some sockets for the Brown Burr op-amps. $27 each though ... Ooh, they must be MilSpec! Don't forget the MilSpec red polish for the opamps.
luvdunhill Posted April 29, 2009 Report Posted April 29, 2009 Ooh, they must be MilSpec! Don't forget the MilSpec red polish for the opamps. that's not any red polish, that's conformal coating... ok, nail polish. Anyways, I guess I'm curious to know if: A.) Kevin's new all DHT amp uses HV opamps B.) If the older DC coupled version, perhaps with DHT output, is worth building Obviously, there's only one person who can answer this
pabbi1 Posted April 30, 2009 Report Posted April 30, 2009 (edited) Kevin Gilmore [email address removed pending permission] _might_ work... Edited April 30, 2009 by n_maher
spritzer Posted April 30, 2009 Report Posted April 30, 2009 Wasn't it bad enough that I started a birthday thread for KG but now you are going to fill his inbox with spam?
kevin gilmore Posted April 30, 2009 Report Posted April 30, 2009 that's not any red polish, that's conformal coating... ok, nail polish. Anyways, I guess I'm curious to know if: A.) Kevin's new all DHT amp uses HV opamps B.) If the older DC coupled version, perhaps with DHT output, is worth building Obviously, there's only one person who can answer this A. NOPE. No sand except in the power supply. Power supply could in fact be all tubes. Will show a picture of the ultra isolated multi channel filament supply at some point. Its really cute. B. Its a real bear to build. I only know of 3 total working units. Voltage compliance at the front end is very tight, and you have to pick very well matched input tubes. Kevin Gilmore [[email protected]] _might_ work... STOP IT. I get enough spam as it is. People know how to find me.
The Monkey Posted April 30, 2009 Report Posted April 30, 2009 STOP IT. I get enough spam as it is. People know how to find me. You need a bat signal.
swt61 Posted April 30, 2009 Report Posted April 30, 2009 STOP IT. I get enough spam as it is. People know how to find me. Mmmm, Spam!
pabbi1 Posted April 30, 2009 Report Posted April 30, 2009 STOP IT. I get enough spam as it is. People know how to find me. Jesus, I'll never learn... lo siento.
luvdunhill Posted April 30, 2009 Report Posted April 30, 2009 STOP IT. I get enough spam as it is. People know how to find me. There's only two Texas de Brazil locations in IL, and only one Fogo de Ch
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