This is a 1 watt tube/ss hybrid practice amp design I have been working on for a while... finally reaching a state of completion!
(http://i757.photobucket.com/albums/xx219/nzCdog/025-1.jpg)
(http://i757.photobucket.com/albums/xx219/nzCdog/026.jpg)
(http://i757.photobucket.com/albums/xx219/nzCdog/029.jpg)
(http://i757.photobucket.com/albums/xx219/nzCdog/033.jpg)
12AU7A preamp, LM386 poweramp. Gain and Tone controls, Bright/Fat switch, 12VDC powered.
Cab is 9mm ply open back with 2x3" Philips old stock speakers... they have a great freq response for a guitar amplifier. It's neat fun to play... surprisingly loud too.
Scratched up a quick demo this avo before the camera went flat... 'scuse the noodly-mess playing and obnoxious guitar change halfway through ;D
If anyone is interested I'll put together a project sheet with the schematic and pcb artwork at some stage. :)
Project doc link here (http://www.madbeanpedals.com/forum/index.php?topic=6904.0)
Sounds good! I love the arrangement of hardware.
Is there much bass to it in real life? YT and handycams don't pick up much bass at all...
Thanks Alan :) You definitely get more thump with bigger speakers... I tried it thru a 2x12 and it was very loud.
Cool man!!
That is really nice!
I'd be in for a pcb! hehe! ;D
Awesome, you must make a head cab for it just to finish the look!
Really impressive! :o
With a Send/Return Loop it could be even better!
That thing looks fun. Very cool build.
Quote from: nzCdog on November 03, 2012, 11:23:26 PM
If anyone is interested I'll put together a project sheet with the schematic and pcb artwork at some stage. :)
Um, heck yes? This is something I've been thinking of for a while (combining the tube pre with the 386).
You got two excellent sounds for such a simple amp in that video: The rangemaster (LM386 amps tend to sound dark) and the Les Paul + reverb with the amp dimed. I don't think it handled the Klon as well, though.
Awesome stuff!
Really like these innovative projects!
Very Cool :o Would love to see this as a project or pcb.
Yes! this is so cool :D I would love to see the schem and a layout. I can see a host of micro 2x3" twins in the future.
very cool! sounds great too! ;D
Love this mate, especially the green jewel lamp :) sounds great, all the best, Matt.
Thanks guys! I'll put together a project sheet when I get time over the next few days :)
Quote from: nzCdog on November 03, 2012, 11:23:26 PM
If anyone is interested I'll put together a project sheet with the schematic and pcb artwork at some stage. :)
That's great, Corey! Really nice project! I'm very interested to see your design! Sounds great! ;)
Does this cute thing run on 12V on both stages? Or do you have a voltage multiplier to run the tube on higher voltage? Could the latter be done? Would it work?
Sorry for the questions, but I was starting to search info to design an amp like yours (maybe based on Beavis's Tube Cricket), but I wanted to run the preamp on higher voltage (70 - 80V.. Like your Boobtube! ;))...
Hector
Hey Hector, thanks man!:)
QuoteDoes this cute thing run on 12V on both stages? Or do you have a voltage multiplier to run the tube on higher voltage? Could the latter be done? Would it work?
Sorry for the questions, but I was starting to search info to design an amp like yours (maybe based on Beavis's Tube Cricket), but I wanted to run the preamp on higher voltage (70 - 80V.. Like your Boobtube!
Well the short answers are, Yes it runs on 12VDC right through... and no, you couldn't run the tube plates at a different voltage... well, not on the pcb I made. You'd need a new circuit design tbh.
Project files added here (http://www.madbeanpedals.com/forum/index.php?topic=6904.0)... enjoy! :)
Quote from: nzCdog on November 06, 2012, 12:59:46 AM
Hey Hector, thanks man!:)
QuoteDoes this cute thing run on 12V on both stages? Or do you have a voltage multiplier to run the tube on higher voltage? Could the latter be done? Would it work?
Sorry for the questions, but I was starting to search info to design an amp like yours (maybe based on Beavis's Tube Cricket), but I wanted to run the preamp on higher voltage (70 - 80V.. Like your Boobtube!
Well the short answers are, Yes it runs on 12VDC right through... and no, you couldn't run the tube plates at a different voltage... well, not on the pcb I made. You'd need a new circuit design tbh.
Yes, I didn't mean if I could run the tube on higher voltages on your design. What I meant is if someone could make a hybrid amp like yours and run only the tube preamp on voltages, which would give higher headroom, and still run the heaters and the 386 power amp on 12V? :)
Sorry if I go off-topic..
Hector
Really enjoy the sounds coming out of your custom rig! I'd been meaning to do a noisy cricket for sometime but I think I'll just go with one of these! Finally something to run my 6x10 that's been idle for much too long.
Quote from: Ettore_M on November 06, 2012, 04:03:13 AM
Quote from: nzCdog on November 06, 2012, 12:59:46 AM
Hey Hector, thanks man!:)
QuoteDoes this cute thing run on 12V on both stages? Or do you have a voltage multiplier to run the tube on higher voltage? Could the latter be done? Would it work?
Sorry for the questions, but I was starting to search info to design an amp like yours (maybe based on Beavis's Tube Cricket), but I wanted to run the preamp on higher voltage (70 - 80V.. Like your Boobtube!
Well the short answers are, Yes it runs on 12VDC right through... and no, you couldn't run the tube plates at a different voltage... well, not on the pcb I made. You'd need a new circuit design tbh.
Yes, I didn't mean if I could run the tube on higher voltages on your design. What I meant is if someone could make a hybrid amp like yours and run only the tube preamp on voltages, which would give higher headroom, and still run the heaters and the 386 power amp on 12V? :)
Sorry if I go off-topic..
Hector
Anything is possible! But it would require an entire new circuit design. The tubes sound different at different voltages, so if you were going to do that you might as well even choose a better power amp and be able get some pristine cleans from a higher wattage IC... the footprint would increase and there'd be lots more parts neccesary to boost the plate voltage. So original the simplicity of this circuit would be out the window right away. To be honest I'm looking forward to what Brian comes up with from his submini tube expeditions ;D
Quote from: bigmufffuzzwizz on November 06, 2012, 12:29:16 PM
Really enjoy the sounds coming out of your custom rig! I'd been meaning to do a noisy cricket for sometime but I think I'll just go with one of these! Finally something to run my 6x10 that's been idle for much too long.
Thanks bro, I definitely want to hear your cab in action if you get this built! 8)
Agreed! Sure thing is what I'm thinking will be more complex than this and simplicity is not the first I want. What I'm after is the "hugeness" I got when playing with an Orange Micro Terror, but without the dirt, in which it depends.
Good recommendation on better power amp! Some weeks ago, I found some LM and TDA amps, that are better quality and have bigger output wattage (some going even to 20W!)..
I guess it's time to get my breadboard ready and start experimenting!
Thanks, Corey!
Hector
That's a super-cool looking cab, too.
Quote from: midwayfair on November 04, 2012, 05:30:06 AM
Quote from: nzCdog on November 03, 2012, 11:23:26 PM
If anyone is interested I'll put together a project sheet with the schematic and pcb artwork at some stage. :)
Um, heck yes? This is something I've been thinking of for a while (combining the tube pre with the 386).
And you'll probably squeeze it in a 1590A... ;)
Sounds great! Thanks for the video. I would love to build one of these..
Just to dam cool really. beans forums are just burying me with "must build" projects :-)
Thanks for the project. Cab is wicked.
Thanks guys... :)
if it were me, id find a old school radio like a cathedral radio and mount the whole thing inside it
It is you. Do it and post pics! 8)
have any boards?
i think im going to do it :o
Hmmmmmm
http://thetubestore.com/ehx12au7g.html
Maybe talk to Haberdasher (http://www.madbeanpedals.com/forum/index.php?topic=2038.0) about etching you one... or ask around, there's bound to be someone else who can do a board for you. :)
I may do a fabbed board at a later stage if there's enough interest
I'd Be interested in a fabbed board!!!!
"B"
and the tube / tube socket has arrived ! ! ! ;D
BTW i got a decent ribbon cable from mouser
Im in the middle of building the Watter, C2 & C4 call for 27n all that Mammoth had was .022uf
will this work, or should i get the right ones from mouser?
Oh btw, im gonna get the MOD 8" for this bad-doggie ! ;D
Woo! You can use 22n or 33n, but it will sound slightly different... I tried lots of different values when designing it. You could use 22n in parallel with 4n7 to get approximately 27n if you prefer... :)
hi
It´s possible to add bass and treble?
on the video that you post and after the rangemaster you are using a OD klone.
What was it?
Thx
Well feel free to experiement! There is a bright/fat switch in the design which alters the frequency response, as well as some suggestions for Cap subsitutes in the build doc ...
The pedals in the video were a HBE Germania, and Madbean Sunking :)
Hi , Have enjoyed following this build and the end product looks and sounds great.
I was wondering if it would be possible to power this project with a RoadRage???
I just realised the RoadRage would not be able to deliver 200ma duh!!! Anyway it will still stay on the wish list :)
Quote from: fendman on January 05, 2013, 03:47:17 PM
Hi , Have enjoyed following this build and the end product looks and sounds great.
Thanks! :)
QuoteI was wondering if it would be possible to power this project with a RoadRage???
No... the tube heater draws too much current for the roadrage. For this project you need a regulated 12VDC power supply capable of at least 250mA depending on the tube you use.
Learned about this through a post on DIYstompboxes...will definitely check it out! THANKS! Larry
Welcome to mad bean !
i think it was me that sent you here ;D
...finnishing my lil watter up here... causing a bump on this thread:)
Foolproof question (statement?): There isnt any black magic going on, right? So: I dont need to connect pin 9 from the tube socket to the board.
***
Another thought, even though i think we play safe: As we are dealing with pretty much more power (and current; 1W in 4Ohms means 0.5A) here, than in "the average stompbox", did you calculate the correct pcb trace width concerning this?
***
Well... ill be back pretty soon with the finnished build:)
Cheers
*** EDIT: Hmm, my intention was to write this post in the "member projects... Lil Watter thread", and i guess i was doublereading while posting... Well, here it is anyway :)
Quote from: midwayfair on November 04, 2012, 05:30:06 AM
Quote from: nzCdog on November 03, 2012, 11:23:26 PM
If anyone is interested I'll put together a project sheet with the schematic and pcb artwork at some stage. :)
Um, heck yes? This is something I've been thinking of for a while (combining the tube pre with the 386).
You got two excellent sounds for such a simple amp in that video: The rangemaster (LM386 amps tend to sound dark) and the Les Paul + reverb with the amp dimed. I don't think it handled the Klon as well, though.
Agreed.. I would love to see this also.
Well I had forgotten about this little fella...6 months ago!!! :o I just have so many builds to do. I will get round to it.
Mike
Quote from: fendman on June 29, 2013, 03:39:20 PM
Well I had forgotten about this little fella...6 months ago!!! :o I just have so many builds to do. I will get round to it.
Mike
Do it Mike! ;D
Quote from: Vallhagen on June 29, 2013, 06:42:44 AM
Foolproof question (statement?): There isnt any black magic going on, right? So: I dont need to connect pin 9 from the tube socket to the board.
Hey Bengt :) No black magic, I promise. It's a completely meaningless solder pad just added for completeness. Ignore it if you wish
QuoteAnother thought, even though i think we play safe: As we are dealing with pretty much more power (and current; 1W in 4Ohms means 0.5A) here, than in "the average stompbox", did you calculate the correct pcb trace width concerning this?
Good question... the pcb traces are plenty big enough for the currents flowing in this circuit... fyi here's a handy calculator (http://circuitcalculator.com/wordpress/?p=25/)
QuoteWell... ill be back pretty soon with the finnished build:)
Awesome, can't wait to see the build pics! 8)
Quote from: nzCdog on June 30, 2013, 01:09:50 AM
Hey Bengt :) No black magic, I promise. It's a completely meaningless solder pad just added for completeness. Ignore it if you wish
Done, ignored:)
Quote from: nzCdog on June 30, 2013, 01:09:50 AM
Good question... the pcb traces are plenty big enough for the currents flowing in this circuit... fyi here's a handy calculator (http://circuitcalculator.com/wordpress/?p=25/)
Ah great, you looked over it allready.
Quote from: nzCdog on June 30, 2013, 01:09:50 AM
Awesome, can't wait to see the build pics! 8)
...youll find it all - including soundclip n stuff - under the "june contest" board:) Edit: Link: http://www.madbeanpedals.com/forum/index.php?topic=10415.0 (http://www.madbeanpedals.com/forum/index.php?topic=10415.0)
***
... and to come back to our earlier discussion; i use the N-4 version of the LM386, and it works just fine. I think you can update your build doc with that recommendation (if not allready done? I havent followed all development about this watter the last months).
Cheers mate! Thanx for a great circuit!
Looks great Bengt, nice build!
I'm glad you like the amp, I've uploaded a new project doc mentioning the N-4 etc in the project thread (http://www.madbeanpedals.com/forum/index.php?topic=6904.0)
*edit whoops wrong link*
If anyone is making boards... pm me!
Normally i'd be nervous of doing amp work, but something that small seems pretty safe to try out. I'd be up for one if someone fabbed some boards!
Haberdasher just made one for me. Get in touch with him!
Love it!! do you have the pcb layout? I have a spare 1 x 12 cab...sounds like something I might have a use for.
P.S. I clicked the "doNOTclick" , yeah sucked me in for about an hour. Being a dog owner I think I might have experienced most of those instances,lol
Quote from: flanagan0718 on April 01, 2014, 05:01:29 PM
Love it!! do you have the pcb layout? I have a spare 1 x 12 cab...sounds like something I might have a use for.
P.S. I clicked the "doNOTclick" , yeah sucked me in for about an hour. Being a dog owner I think I might have experienced most of those instances,lol
Layout can be easily found in the Members Projects section, if you don't etch, Haderbasher can make it for you ;)
This is seriously an awesome project, kicks the shit out of a noisy cricket!
Quote from: GrindCustoms on April 01, 2014, 05:09:52 PM
Quote from: flanagan0718 on April 01, 2014, 05:01:29 PM
Love it!! do you have the pcb layout? I have a spare 1 x 12 cab...sounds like something I might have a use for.
P.S. I clicked the "doNOTclick" , yeah sucked me in for about an hour. Being a dog owner I think I might have experienced most of those instances,lol
Layout can be easily found in the Members Projects section, if you don't etch, Haderbasher can make it for you ;)
This is seriously an awesome project, kicks the shit out of a noisy cricket!
Yeah the Noisy Cricket seemed lame by all the videos I watched. Maybe i'll etch myself a board.
Quote from: flanagan0718 on April 01, 2014, 05:01:29 PM
Love it!! do you have the pcb layout? I have a spare 1 x 12 cab...sounds like something I might have a use for.
P.S. I clicked the "doNOTclick" , yeah sucked me in for about an hour. Being a dog owner I think I might have experienced most of those instances,lol
Thanks man. Ha! Wondered if anyone had clicked it... hilarious loldogs ftw! ;D
Sir corey,
Just wanted to ask do you think this would work with a MJ2955 transistor amplifier right after the output. with 2 mj2955's power can be raised to 30watts. But i know mj's work as playback amplifiers. what cha think. I really love mine use it alot. But jamming throught a home stereo the amp just can keep up with the output.
hi,i have a question，on the schematic, R1,R2,R12,R13 is 3k3,and at your pcb layout, it change to 1m,why?
Quote from: Chongwen Wang on March 19, 2016, 01:42:11 AM
hi,i have a question，on the schematic, R1,R2,R12,R13 is 3k3,and at your pcb layout, it change to 1m,why?
Not 3k3.... 3M3! You can follow either schematic, but not a mixture of both. :)
I see where the confusion is now, a mistake on the build doc which I will fix and re-upload. They are simply voltage dividing resistors. Please see this link (http://www.madbeanpedals.com/forum/index.php?topic=6904.0) for the latest doc. Thanks, and sorry for the confusion :)
Just came across this little amp, whilst looking at the tube cricket. To my ear this one sounds better. Does anyone have a vero layout or better still a gerber they'd be willing to share?