Good Job... Very well done! Care to share the schemaitcs? I would love to build it with a 12AX7 and a EL84. I would use Edcor transformers in that beautiful blue color... Comon share the schematics!
@chisleu Yes class A , 2x 5watts . See the EL84 and ECC81 on each channel. This project is known by everyone, I just made some improvements on feedback , used metal film and polypropylene capacitors at all points except at power source where I used common "Epcos" capacitors.
@00187500 well it sounds wonderful. I would like to have something similar. I have a mono tube guitar amp with an attenuator w/ headphone output. It sounds great through the headphones (surprisingly)
@serfabr I've seen anything from 10 to 18 watts from 2 EL84's in the power section. Are you a musician by chance? Able to try it with an electric guitar?
@smoss469 Boogie just created a new record on that, the "Trans-Atlantic". In full-power mode it pumps 25 watts RMS with a pair of EL84's in P/P, but this guy's amp appears to be two separate (left and right channels) single-ended EL84 output sections. With high PV and the right output transformers you can push up to 7 watts per side this way, though I wouldn't recommend more than 5 watts for HiFi use.......for guitar on the other hand, CRANK IT UP!
@AdamRainStopper I had a look at MesaBoogie's site and its true, 25 watts from the amp, however it doesn't say how they achieve this. The anode dissipation of an EL84 is 5.5w and running Class A/B would reduce output markedly. Going from SE to PP operation requires different output transformers so I'm inclined to believe they are lying! Maybe its a valve amp with MOSFET assistance?
@3Deity It is possible, I think it's just more likely we missed some fine print........like "25 watts peak" and then in really tiny letters, "18 watts RMS". . . . .you CAN get up to the mid-20's from a pair of L84s in PP, but if you run it on that 25 watt setting frequently, I'm sure it will need to be retubed 3 or 4 times as often as a typical PP EL84 amp, and really, being 25 watts instead of 20 or 18 won't make a noticeable volume difference anyway.
@AdamRainStopper Peak would be voltage, not current. You need four EL84s to get 22 watts. There was some idiot on a forum getting 10w from a SE EL84, the anode was almost yellow, he said "Some of the vintage RCAs and Mullard last almost 10 minutes." People on the forum where trying to find his address so they could kill him! I'll recheck Mesa's site but its probably DIN and not RMS - you know, like PC speakers that claim 400w which is a theoretical limit of the chipset, not the PSU! :o)
@3Deity I understand that, but companies DO put X-amounts of watts "peak", Y-amount of watts "musical power", and then the real number of watts RMS....like Pyramid. They have a 1x8" combo that advertises itself as a "400 watt guitar amp", then in fine print it says 400 peak, 250 musical power, and 22 watts rms. The kind of person who buys a pyramid amp is either not going to understand any of that (and they are technically not lying, because they aren't actually saying anything) or doesn't care.
@AdamRainStopper Too true! Gods, could you imagine what, say, the Chord SPM 1200 power amp COULD be billed as? Its a 1200 watt lattice Class A which only uses a tiny amount of that potential power in reality, but it can do it - and thats a 20 year old amp! They did an SPM 1000000 or something for the anniversary and drew straw for what unfortunate was to switch it on! :o)
@3Deity I played a place in New London CT called the "El 'N' Gee club" a few months ago. They have 4 PA cabinets with 2x15" and 2 horns each, entire drum kit mic'ed, and our bassist uses a 2x15 and a 400 watt MOSFET amp. I am the only guitarist, and my peavey classic 30 through a pair of pine 2x12s with T-75's and V-30's was more than loud enough. That amp is 30 watts RMS. I had the gain and master set about 2/3 of the way up.
@AdamRainStopper 20 years ago I was in a rehearsal room and they asked me to turn it up - 60w mosfet 1x12" and within seconds they where begging me to turn it down. Conversely, I've played on a stage with a Marshall 100w head and 4x12" and couldn't hear myself. Acoustics are a strange thing. Steve Morse turns his angled cabs through 90 degrees to get good spread.
@AdamRainStopper Heheeeee! If thats true then let me say your secret is safe *and* you're dad is a genuis and the only true guitar player I've seen in nearly 30 years playing! :o)
@3Deity Ever heard of a guy named Ken Nash? ("The New Johnny Five") He's my go to guy when I can't "diy" something. Very skilled luthier, and local to us. He's known my dad for a few hundred years now........ If you're ever in New London CT or Westerly RI or any of the surrounding areas, stop by his shop. He has this strat in there (a 70's model that originally had tiny frets) that he refretted with stainless steel super-jumbo. You play this strat, you'll want stainless refrets on everything.
@AdamRainStopper Ken Nash rings a bell actually, I live in Brighton, UK, (I saw a band here once, Deep Moave or something..) but I know people in CT. I used to know a genius luthier in Kent called Steve Acworth, he made guitars for Floyd, the Stones and local Jeff Beck. Always handy to know these oddball characters as you bounce your ideas off them to get twenty back - like shining light into a crystal Stainless frets? I'll have to try that! Stainless strings are ace on vintage style strats.
@3Deity Not quiet at all. My Classic 30 with a pair of 2x12sis probably 90% as loud as a 100 watt 6L6 amp. That's the thing about tube amps, a 5 watt amp is loud for the bedroom, a 10 watt amp is a little bit louder (nowhere near twice as loud as the 5 though) and there's very little volume difference between a 30 watt quad-EL84 amp and a 100 watt quad-EL34 amp. A 50 watt JCM800 and a 100 watt JCM800 with the same cabinet are almost the same volume when cranked, only 3 or 4 decibels difference.
@AdamRainStopper Totally, between 25w and 50w is where the tone is generally - enough to kick the speaker into proper breakup. JCM800 - Its a similar thing with super cars, to go from 200 to 230mph requires twice the power. I have a 1970 Super Bass Head, take two EL34s out and run it in 8 ohms for monster ampage, well, I would do but its so damn noisy and it is completely mint so I can't gig it ever! Glad to talk, I'm going to make a guitar amp but have been hung up on the output stage.
@3Deity My new thing is 6AQ5's. They are similar electrically to 6V6s, but in a smaller bottle. They sound good at low volumes and they sound good pushed to their breaking point too. With a high-gain pre and a post PI master volume, you can get studio volumes, high-gain, and the power amp cleanly and clearly reproduces the voice of the cascaded preamp stages, with lots of tight punch. These are 6AQ5's, not 6BQ5's (EL84's). A pair can make a nice 12-15 watt PP amp for studio use.
@smoss469 This amplifier is HIFI and has two channels with a maximum 5 watts each channel, single-ended configuration. To get to 10 or 12 watts has to be push-pull with two EL84.
I am not a musician although I like music very much especially the guitar solos
See, I wrote that 15Watts is another project that am initiating using the valve 19BG6. With EL84 in A Class do not leave more than 5~6 Watts certainly.
@serfabr I realize that this is an audiofile rule by which you are working, but try 7189s. They are rated for higher voltages, but even without, they can produce more output and have more headroom, and a MUCH higher fidelity sound. They can be used as drop-in replacements. I put one in my single ended EL84 guitar amp, and it improved the sound by 1,000%.
@serfabr I noticed much greater definition, more clarity, and more headroom. I have a single ended pentode preamp, so I don't need to overdrive my amp in order to get single ended harmonic distortion and compression, and for clean tones, the 7189s are unparalleled. They have a much clearer, more accurate sound. They also seem to have a much broader spectrum of response, but a lot of that also depends on your output tranny. But yes, more definition, clarity, & power. A multi-dimensional sound.
@punkeratheart So the 7189s sound really good, eh? How much does it cost to put it together and can you send me a schematic and parts list (I'll pay you for it)? Have you tried higher output tubes?
Many thanks. It went to my first attempt in class A with valves and I liked the result. I begin to project other class A with the valves 19BG6GA, 15 watts / channels we are going to see the result.
Certainlyit will not be energy safe but it will have an excellent sound.
My Denon sounds cleaner and louder :)
yourbro81 1 day ago
that sounds beautiful.
jbbrwockye 3 months ago
whats the name of this song??
marcosfriendmisty 6 months ago
i think this one got less power than the normal one
kamil3985 7 months ago
Nice!
engineer21261 7 months ago
Is the music FLAC or Mp3 ? best input for best output, the camera doesnt do it justice i think, but it looks really sweet :)
gnialf 7 months ago
@gnialf Is not FLAC , in the movie is a simple MP3 player with the file recorded in WMA.
Now is plugged into my computer where I usually play WMAL, a few hours ago I was listening Bob Mintzer Big Band, very good.
I will find out more about FLAC.
Many thanks for the comments.
00187500 7 months ago
What kind of output transformers does it use? :)
JedClampettJr 11 months ago
Good Job... Very well done! Care to share the schemaitcs? I would love to build it with a 12AX7 and a EL84. I would use Edcor transformers in that beautiful blue color... Comon share the schematics!
ccronn 11 months ago
Share the schematics? I am building one now...
ccronn 1 year ago
Whats the name of the song?
camflex66 1 year ago
@camflex66 Sorry the late reply, this sound is of Diana Krall "I`ve grown accustomed to his face ". A wonderful voice into a beautiful woman
00187500 1 year ago
this thing sounds like crap
jackillac92 1 year ago 2
nice but what happens when someone trips on its cord!
killllshot 1 year ago
@killllshot yehhh, MP3 cable is too long and had to curl, it was only an experiment. But the idea is good, I can make a trap too .... hehehehe
serfabr 1 year ago
very good!!
electrically 'simple', good looking and not tons of useless watts but musically powerful!!!!
GigiAO28 1 year ago
Nice layout, bet it sounds great.
joralebedev 1 year ago
Looks like a very nice build, do you have shematics/layout for this amp?
barrycasebeer 2 years ago
This is single ended el84. Should be capable of 3 watts per channel. Plenty for efficient speakers in a small room.
ethorii 2 years ago
Sorry I dont know so this am. is AB I thing so only A
svarcpatrik96 2 years ago
cool!
TurboDieselRabbit 2 years ago
Yes, with 2X EL84 push pull. I think that should give a power of 10Watts correct? I did in Class A only as experience.
serfabr 2 years ago
galleazzi - about 14-17 watts
GalleazziAntonio 1 year ago
@serfabr if it is push pull, then it is class A-B not class A, and 2x EL84's in push pull would be 15watts.
Yours is a stereo Class A though correct?
chisleu 1 year ago
@chisleu Yes class A , 2x 5watts . See the EL84 and ECC81 on each channel. This project is known by everyone, I just made some improvements on feedback , used metal film and polypropylene capacitors at all points except at power source where I used common "Epcos" capacitors.
00187500 1 year ago
@00187500 well it sounds wonderful. I would like to have something similar. I have a mono tube guitar amp with an attenuator w/ headphone output. It sounds great through the headphones (surprisingly)
chisleu 1 year ago
@serfabr jup that will work nicely . 10w is kinda pessimistic . i guess 12 would be possible .
florickwar2 1 year ago
@serfabr I've seen anything from 10 to 18 watts from 2 EL84's in the power section. Are you a musician by chance? Able to try it with an electric guitar?
smoss469 1 year ago
@smoss469 Boogie just created a new record on that, the "Trans-Atlantic". In full-power mode it pumps 25 watts RMS with a pair of EL84's in P/P, but this guy's amp appears to be two separate (left and right channels) single-ended EL84 output sections. With high PV and the right output transformers you can push up to 7 watts per side this way, though I wouldn't recommend more than 5 watts for HiFi use.......for guitar on the other hand, CRANK IT UP!
AdamRainStopper 11 months ago
@AdamRainStopper I had a look at MesaBoogie's site and its true, 25 watts from the amp, however it doesn't say how they achieve this. The anode dissipation of an EL84 is 5.5w and running Class A/B would reduce output markedly. Going from SE to PP operation requires different output transformers so I'm inclined to believe they are lying! Maybe its a valve amp with MOSFET assistance?
3Deity 8 months ago
@3Deity It is possible, I think it's just more likely we missed some fine print........like "25 watts peak" and then in really tiny letters, "18 watts RMS". . . . .you CAN get up to the mid-20's from a pair of L84s in PP, but if you run it on that 25 watt setting frequently, I'm sure it will need to be retubed 3 or 4 times as often as a typical PP EL84 amp, and really, being 25 watts instead of 20 or 18 won't make a noticeable volume difference anyway.
AdamRainStopper 8 months ago
@AdamRainStopper Peak would be voltage, not current. You need four EL84s to get 22 watts. There was some idiot on a forum getting 10w from a SE EL84, the anode was almost yellow, he said "Some of the vintage RCAs and Mullard last almost 10 minutes." People on the forum where trying to find his address so they could kill him! I'll recheck Mesa's site but its probably DIN and not RMS - you know, like PC speakers that claim 400w which is a theoretical limit of the chipset, not the PSU! :o)
3Deity 8 months ago
@3Deity I understand that, but companies DO put X-amounts of watts "peak", Y-amount of watts "musical power", and then the real number of watts RMS....like Pyramid. They have a 1x8" combo that advertises itself as a "400 watt guitar amp", then in fine print it says 400 peak, 250 musical power, and 22 watts rms. The kind of person who buys a pyramid amp is either not going to understand any of that (and they are technically not lying, because they aren't actually saying anything) or doesn't care.
AdamRainStopper 8 months ago
@AdamRainStopper Too true! Gods, could you imagine what, say, the Chord SPM 1200 power amp COULD be billed as? Its a 1200 watt lattice Class A which only uses a tiny amount of that potential power in reality, but it can do it - and thats a 20 year old amp! They did an SPM 1000000 or something for the anniversary and drew straw for what unfortunate was to switch it on! :o)
3Deity 8 months ago
@3Deity I played a place in New London CT called the "El 'N' Gee club" a few months ago. They have 4 PA cabinets with 2x15" and 2 horns each, entire drum kit mic'ed, and our bassist uses a 2x15 and a 400 watt MOSFET amp. I am the only guitarist, and my peavey classic 30 through a pair of pine 2x12s with T-75's and V-30's was more than loud enough. That amp is 30 watts RMS. I had the gain and master set about 2/3 of the way up.
AdamRainStopper 8 months ago
@AdamRainStopper 20 years ago I was in a rehearsal room and they asked me to turn it up - 60w mosfet 1x12" and within seconds they where begging me to turn it down. Conversely, I've played on a stage with a Marshall 100w head and 4x12" and couldn't hear myself. Acoustics are a strange thing. Steve Morse turns his angled cabs through 90 degrees to get good spread.
3Deity 8 months ago
@3Deity So does his kid, Adam Morse. . . aka "adamrainstopper";-)
AdamRainStopper 8 months ago
@AdamRainStopper Heheeeee! If thats true then let me say your secret is safe *and* you're dad is a genuis and the only true guitar player I've seen in nearly 30 years playing! :o)
3Deity 8 months ago
@3Deity Ever heard of a guy named Ken Nash? ("The New Johnny Five") He's my go to guy when I can't "diy" something. Very skilled luthier, and local to us. He's known my dad for a few hundred years now........ If you're ever in New London CT or Westerly RI or any of the surrounding areas, stop by his shop. He has this strat in there (a 70's model that originally had tiny frets) that he refretted with stainless steel super-jumbo. You play this strat, you'll want stainless refrets on everything.
AdamRainStopper 8 months ago
@AdamRainStopper Ken Nash rings a bell actually, I live in Brighton, UK, (I saw a band here once, Deep Moave or something..) but I know people in CT. I used to know a genius luthier in Kent called Steve Acworth, he made guitars for Floyd, the Stones and local Jeff Beck. Always handy to know these oddball characters as you bounce your ideas off them to get twenty back - like shining light into a crystal Stainless frets? I'll have to try that! Stainless strings are ace on vintage style strats.
3Deity 8 months ago
@AdamRainStopper That must have been a very quiet gig? That would have been about 4,000w but must have been down low.
3Deity 8 months ago
@3Deity Not quiet at all. My Classic 30 with a pair of 2x12sis probably 90% as loud as a 100 watt 6L6 amp. That's the thing about tube amps, a 5 watt amp is loud for the bedroom, a 10 watt amp is a little bit louder (nowhere near twice as loud as the 5 though) and there's very little volume difference between a 30 watt quad-EL84 amp and a 100 watt quad-EL34 amp. A 50 watt JCM800 and a 100 watt JCM800 with the same cabinet are almost the same volume when cranked, only 3 or 4 decibels difference.
AdamRainStopper 8 months ago
@AdamRainStopper Totally, between 25w and 50w is where the tone is generally - enough to kick the speaker into proper breakup. JCM800 - Its a similar thing with super cars, to go from 200 to 230mph requires twice the power. I have a 1970 Super Bass Head, take two EL34s out and run it in 8 ohms for monster ampage, well, I would do but its so damn noisy and it is completely mint so I can't gig it ever! Glad to talk, I'm going to make a guitar amp but have been hung up on the output stage.
3Deity 8 months ago
@3Deity My new thing is 6AQ5's. They are similar electrically to 6V6s, but in a smaller bottle. They sound good at low volumes and they sound good pushed to their breaking point too. With a high-gain pre and a post PI master volume, you can get studio volumes, high-gain, and the power amp cleanly and clearly reproduces the voice of the cascaded preamp stages, with lots of tight punch. These are 6AQ5's, not 6BQ5's (EL84's). A pair can make a nice 12-15 watt PP amp for studio use.
AdamRainStopper 8 months ago
@AdamRainStopper Dude, I sent you a personal mail, check your YouTube inbox too! :o) Very apt you should mention this tube.
3Deity 8 months ago
@smoss469 This amplifier is HIFI and has two channels with a maximum 5 watts each channel, single-ended configuration. To get to 10 or 12 watts has to be push-pull with two EL84.
I am not a musician although I like music very much especially the guitar solos
00187500 11 months ago
@00187500 No, you can get 10-12w by running PSE. There is no excuse for PP ever.
3Deity 8 months ago
hhhhhhh 15W hhhhhhh There amp. has got only 5W EL84. But nice construction
svarcpatrik96 2 years ago
See, I wrote that 15Watts is another project that am initiating using the valve 19BG6. With EL84 in A Class do not leave more than 5~6 Watts certainly.
serfabr 2 years ago
@serfabr I realize that this is an audiofile rule by which you are working, but try 7189s. They are rated for higher voltages, but even without, they can produce more output and have more headroom, and a MUCH higher fidelity sound. They can be used as drop-in replacements. I put one in my single ended EL84 guitar amp, and it improved the sound by 1,000%.
punkeratheart 1 year ago
@punkeratheart OK, the datasheets are almost equal, but I was curious what you noticed in the sound? Greater definition? increase in power?
Tks for the return
serfabr 1 year ago
@serfabr I noticed much greater definition, more clarity, and more headroom. I have a single ended pentode preamp, so I don't need to overdrive my amp in order to get single ended harmonic distortion and compression, and for clean tones, the 7189s are unparalleled. They have a much clearer, more accurate sound. They also seem to have a much broader spectrum of response, but a lot of that also depends on your output tranny. But yes, more definition, clarity, & power. A multi-dimensional sound.
punkeratheart 1 year ago
@punkeratheart So the 7189s sound really good, eh? How much does it cost to put it together and can you send me a schematic and parts list (I'll pay you for it)? Have you tried higher output tubes?
49kasey 1 year ago
@punkeratheart And why do you need a pentode preamp instead of a triode?
49kasey 1 year ago
@49kasey ECC81 is a double triode , not pentode.
Triode has lower distortion though less amplification
00187500 1 year ago
WOW, what a fabulous work of art !
Let me put in a order for one ?
kimbalxyz 2 years ago
Unfortunately mine present work requires that I travels a lot and now I am without time for develop and mount amplifiers but many thanks.
serfabr 2 years ago
Very nice - Congrats! :o)
3Deity 2 years ago
Many thanks. It went to my first attempt in class A with valves and I liked the result. I begin to project other class A with the valves 19BG6GA, 15 watts / channels we are going to see the result.
Certainlyit will not be energy safe but it will have an excellent sound.
serfabr 2 years ago
Hi! I really liked this sound! Do you have schematics? pictures of construction?
phildas 2 years ago