"It's not a bomb!"
Moderator: Beowulf
"It's not a bomb!"
One of my recurring dreams is coming home to find a SWAT team and bomb squad camped out in my appartment because someone mistook my audio gear for a bomb...
aerius: I'll vote for you if you sleep with me.
Lusankya: Deal!
Say, do you want it to be a threesome with your wife? Or a foursome with your wife and sister-in-law? I'm up for either.
Lusankya: Deal!
Say, do you want it to be a threesome with your wife? Or a foursome with your wife and sister-in-law? I'm up for either.
So what the hell is it?
EBC|Fucking Metal|Artist|Androgynous Sexfiend|Gozer Kvltist|
Listen to my music! http://www.soundclick.com/nihilanth
"America is, now, the most powerful and economically prosperous nation in the country." - Master of Ossus
Listen to my music! http://www.soundclick.com/nihilanth
"America is, now, the most powerful and economically prosperous nation in the country." - Master of Ossus
- kheegster
- Jedi Council Member
- Posts: 2397
- Joined: 2002-09-14 02:29am
- Location: An oasis in the wastelands of NJ
Looks like containers of nitroglycerine with an attached timer to me....
Articles, opinions and rants from an astrophysicist: Cosmic Journeys
-
- Sith Marauder
- Posts: 4901
- Joined: 2004-07-19 11:20am
- Bertie Wooster
- Jedi Council Member
- Posts: 1830
- Joined: 2003-10-07 04:38pm
- Location: reposed at the bosom of Nyx on the shores of Formentera
- Contact:
That's nothing. This guy I know has his house filled with gigantic transistor radios. The living room has about a dozen, the den has about a dozen, and the basement has several dozen. And these radios are huge; like the size of small refrigerators.Mrs Kendall wrote:What a messy looking home stereo system
I truly feel for J and muse who have to look at that everyday.
Imagine how that guy's wife deals with a house full of transistor radios.
- TheBlackCat
- Padawan Learner
- Posts: 412
- Joined: 2006-02-11 01:01pm
- Contact:
Looks like a bunch of massive capacitors and a few big-ass inductors wired to a circuit board and bolted to a piece of a table.Rye wrote:So what the hell is it?
When two opposite points of view are expressed with equal intensity, the truth does not necessarily lie exactly halfway between them. It is possible for one side to be simply wrong.
-Richard Dawkins
-Richard Dawkins
- Isolder74
- Official SD.Net Ace of Cakes
- Posts: 6762
- Joined: 2002-07-10 01:16am
- Location: Weber State of Construction University
- Contact:
yep. and those capaciters have a very real possibility to go bang if wired wrong. It may not be a bomb but man put that thin in a box! If only to cover all those bare wires!TheBlackCat wrote:Looks like a bunch of massive capacitors and a few big-ass inductors wired to a circuit board and bolted to a piece of a table.Rye wrote:So what the hell is it?
Hapan Battle Dragons Rule!
When you want peace prepare for war! --Confusious
That was disapointing ..Should we show this Federation how to build a ship so we may have worthy foes? Typhonis 1
The Prince of The Writer's Guild|HAB Spacewolf Tank General| God Bless America!
When you want peace prepare for war! --Confusious
That was disapointing ..Should we show this Federation how to build a ship so we may have worthy foes? Typhonis 1
The Prince of The Writer's Guild|HAB Spacewolf Tank General| God Bless America!
It's a vacuum tube headphone and speaker amplifier.Rye wrote:So what the hell is it?
Amp schematicBraedley wrote:Can I have the schematics for that?
Power supply schematic
The 2.3k resistor on the cathode of the ECC40 is actually a 5k resistor in parallel with a 5k 20-turn trimpot. This lets you adjust the left-right balance in case the tubes don't quite match. Use a straight 2.2k for the prototype build. The output transformer was stolen from another amplifier kit so I have no idea what it is. Look for an audio output transformer that's rated for an 8 Ohm output with a 7200 Ohm primary impedance and a ~10W power rating. The tube filament voltage is 6V, I forgot to put that on the schematic.
The cheapskate method is to order a toroidal power transformer from Digikey (part# 62031), wire together purple & black for the centre tap and put the secondaries in series for the output. Doesn't sound as good but it works.
The capacitors are Aerovox motor run capacitors, but you can use generic electrolytic ones. Just make sure they're rated for at least 250V and don't put them in backwards.
If you want to drive speakers, use a 6BL7 or 6BX7 instead of the 6SN7. Should be good for 3-5W.
BTW, good luck finding a socket for the ECC40 tube. You could use a 6CG7, 6FQ7, 6SN7, or 12AU7, sockets for those are easily available, but the tube pinouts are different so adjust schematic to match. Pinout for the ECC40 can be found here.
Oh yeah, forgot about the power supply notes in case anyone wants to build it. What I have is a complete overkill power supply. For size and practicality purposes, a CRCRCRCRC power supply will do. About 330uF for the first C, 220uF for the next 2, and 100uF for the last 2. Resistors should be about 500 Ohm to 1k, take the power for the output stage off the 3rd C and the input off the final one. The voltage will probably be a bit over 250V, but that's fine.
Last edited by aerius on 2006-04-08 10:24pm, edited 1 time in total.
aerius: I'll vote for you if you sleep with me.
Lusankya: Deal!
Say, do you want it to be a threesome with your wife? Or a foursome with your wife and sister-in-law? I'm up for either.
Lusankya: Deal!
Say, do you want it to be a threesome with your wife? Or a foursome with your wife and sister-in-law? I'm up for either.
- Ford Prefect
- Emperor's Hand
- Posts: 8254
- Joined: 2005-05-16 04:08am
- Location: The real number domain
- Crossroads Inc.
- Emperor's Hand
- Posts: 9233
- Joined: 2005-03-20 06:26pm
- Location: Defending Sparkeling Bishonen
- Contact:
Vac-Vacuume tubes? Wow, WOW! My respect for you just soraed, seriously where does one even get Vacuume tubes these days?
Praying is another way of doing nothing helpful
"Congratulations, you get a cookie. You almost got a fundamental English word correct." Pick
"Outlaw star has spaceships that punch eachother" Joviwan
Read "Tales From The Crossroads"!
Read "One Wrong Turn"!
"Congratulations, you get a cookie. You almost got a fundamental English word correct." Pick
"Outlaw star has spaceships that punch eachother" Joviwan
Read "Tales From The Crossroads"!
Read "One Wrong Turn"!
- Singular Quartet
- Sith Marauder
- Posts: 3896
- Joined: 2002-07-04 05:33pm
- Location: This is sky. It is made of FUCKING and LIMIT.
- Spanky The Dolphin
- Mammy Two-Shoes
- Posts: 30776
- Joined: 2002-07-05 05:45pm
- Location: Reykjavík, Iceland (not really)
Vacuum tubes are actually still widely used in many applications, particularly with high-end audio equipment. They're somewhat easy to get.Crossroads Inc. wrote:Vac-Vacuume tubes? Wow, WOW! My respect for you just soraed, seriously where does one even get Vacuume tubes these days?
Plus, my guitar amp has vacuum tubes in it. A digital electric guitar is virtual heresy.
Gee-wiz, Fluke Starbucker!!
I believe in a sign of Zeta.
[BOTM|WG|JL|Mecha Maniacs|Pax Cybertronia|Veteran of the Psychic Wars|Eva Expert]
"And besides, who cares if a monster destroys Australia?"
Crossroads Inc. wrote:seriously where does one even get Vacuume tubes these days?
From VacuumTubes.net of course, and my local electronics surplus stores.Singular Quartet wrote:That's a good question, actually. I'd like to now, since it interests me to actually build a new amplifier, rather than use the pieces of shit I have now...
aerius: I'll vote for you if you sleep with me.
Lusankya: Deal!
Say, do you want it to be a threesome with your wife? Or a foursome with your wife and sister-in-law? I'm up for either.
Lusankya: Deal!
Say, do you want it to be a threesome with your wife? Or a foursome with your wife and sister-in-law? I'm up for either.
- Wicked Pilot
- Moderator Emeritus
- Posts: 8972
- Joined: 2002-07-05 05:45pm
- Spanky The Dolphin
- Mammy Two-Shoes
- Posts: 30776
- Joined: 2002-07-05 05:45pm
- Location: Reykjavík, Iceland (not really)
I have those too. The circuit board near the top is a Kevin Gilmore headphone amp, and there's another one of those inside the box. But tubes glow in the dark and look cooler.phongn wrote:Ya'know, we have these magic things called transistors now
aerius: I'll vote for you if you sleep with me.
Lusankya: Deal!
Say, do you want it to be a threesome with your wife? Or a foursome with your wife and sister-in-law? I'm up for either.
Lusankya: Deal!
Say, do you want it to be a threesome with your wife? Or a foursome with your wife and sister-in-law? I'm up for either.
He says he'll eventually stop tweaking it and build a pretty case for it, unfortunately I don't see that happening anytime soon. I have to admit though, it does sound great.Mrs Kendall wrote:What a messy looking home stereo system
I truly feel for J and muse who have to look at that everyday.
This post is a 100% natural organic product.
The slight variations in spelling and grammar enhance its individual character and beauty and in no way are to be considered flaws or defects
I'm not sure why people choose 'To Love is to Bury' as their wedding song...It's about a murder-suicide
- Margo Timmins
When it becomes serious, you have to lie
- Jean-Claude Juncker
The slight variations in spelling and grammar enhance its individual character and beauty and in no way are to be considered flaws or defects
I'm not sure why people choose 'To Love is to Bury' as their wedding song...It's about a murder-suicide
- Margo Timmins
When it becomes serious, you have to lie
- Jean-Claude Juncker
Just like Vynle producers better music then CDs.Spanky The Dolphin wrote:Tansistors are a rape against art for music electronics.phongn wrote:Ya'know, we have these magic things called transistors now
Vacume Tubes produce music that is of less quality then a transistor. A Transistor produces music as close to the real thing as possible. People who prefer vacume tubes are the sort who prefer sloppy listening and can't actualy stand to listen to the real thing. You might prefer vacume tubes, but they produce a technicaly lower copy reproduction.
"If the facts are on your side, pound on the facts. If the law is on your side, pound on the law. If neither is on your side, pound on the table."
"The captain claimed our people violated a 4,000 year old treaty forbidding us to develop hyperspace technology. Extermination of our planet was the consequence. The subject did not survive interrogation."
"The captain claimed our people violated a 4,000 year old treaty forbidding us to develop hyperspace technology. Extermination of our planet was the consequence. The subject did not survive interrogation."
- Spanky The Dolphin
- Mammy Two-Shoes
- Posts: 30776
- Joined: 2002-07-05 05:45pm
- Location: Reykjavík, Iceland (not really)
Frankly I'd never buy a digital electric guitar setup, that's sure as hell for certain. The amp's use of vacuum tubes is a major aspect to their sound.
I believe in a sign of Zeta.
[BOTM|WG|JL|Mecha Maniacs|Pax Cybertronia|Veteran of the Psychic Wars|Eva Expert]
"And besides, who cares if a monster destroys Australia?"
- Darth Wong
- Sith Lord
- Posts: 70028
- Joined: 2002-07-03 12:25am
- Location: Toronto, Canada
- Contact:
Did you know that people have made processing circuits that can duplicate the distortion products of vacuum tubes in transistor amps? Transistor amps only sound really bad when you drive them past their design limits, and in general, you can make a transistor with far more peak power output than a vacuum tube amp.Spanky The Dolphin wrote:Frankly I'd never buy a digital electric guitar setup, that's sure as hell for certain. The amp's use of vacuum tubes is a major aspect to their sound.
"It's not evil for God to do it. Or for someone to do it at God's command."- Jonathan Boyd on baby-killing
"you guys are fascinated with the use of those "rules of logic" to the extent that you don't really want to discussus anything."- GC
"I do not believe Russian Roulette is a stupid act" - Embracer of Darkness
"Viagra commercials appear to save lives" - tharkûn on US health care.
http://www.stardestroyer.net/Mike/RantMode/Blurbs.html
"you guys are fascinated with the use of those "rules of logic" to the extent that you don't really want to discussus anything."- GC
"I do not believe Russian Roulette is a stupid act" - Embracer of Darkness
"Viagra commercials appear to save lives" - tharkûn on US health care.
http://www.stardestroyer.net/Mike/RantMode/Blurbs.html
Depends. At the power levels required for most speakers, you're right. At the levels needed for headphones or pre-amps (fractions of a Watt), vacuum tubes are better because of their superior low-level linearity. You can see this by comparing the plate voltage curves of a tube and the transistor. The former will have parallel and mostly straight lines all the way down to the cutoff, while the latter has curved lines that become non-parallel near cut-off. Which means tubes perform best at low levels while transistors need to be cranked up a bit to work well. The linearity means you can do away with negative feedback altogether, which means better phase margins, slew rates, much reduced high order harmonic distortion and more natural sound.Alyeska wrote:Vacume Tubes produce music that is of less quality then a transistor. A Transistor produces music as close to the real thing as possible. People who prefer vacume tubes are the sort who prefer sloppy listening and can't actualy stand to listen to the real thing. You might prefer vacume tubes, but they produce a technicaly lower copy reproduction.
Problem is none of the big tube amp companies design things right and they end up with mushy tubey sound because the tubes are being driven past specs and soft-clipping, and the output transformers are made for optimum power transfer instead of maximizing bandwidth. Design a tube amp right and you can have 0.05% THD measurements at up to maybe 5W or so.
Plate curves for 6SN7 tube PDF file, page 3.
Curves for transistor
aerius: I'll vote for you if you sleep with me.
Lusankya: Deal!
Say, do you want it to be a threesome with your wife? Or a foursome with your wife and sister-in-law? I'm up for either.
Lusankya: Deal!
Say, do you want it to be a threesome with your wife? Or a foursome with your wife and sister-in-law? I'm up for either.
-
- Sith Marauder
- Posts: 4901
- Joined: 2004-07-19 11:20am
Haha, the empty promises Just kidding Sounds good but looks fugly rightJ wrote:He says he'll eventually stop tweaking it and build a pretty case for it, unfortunately I don't see that happening anytime soon. I have to admit though, it does sound great.Mrs Kendall wrote:What a messy looking home stereo system
I truly feel for J and muse who have to look at that everyday.