DIY Guitar Amplifier Marshall JCM800 1Watt

[@Tom-th1oy]

I watched this video when you initially posted it, and thought “ It’s nice, but no big deal.. it is just a kit.” I don’t know if I was just in a bad mood, or the taxes were due or something.. Because I just watched it again, realized it wasn’t a kit, the quality of components, the watch like precision of your layout, and the positioning and soldering looks more appropriate in an art museum than the inside of a mere amplifier! Your work is truly stunning!! The only thing that could make it nicer would be switchable rectification (from diodes to say a GZ34 tube) and that’s just an opinion, not a fact. You built it so nice, I’m motivated now to build one myself… So Thank you, Beautiful build

[@crisetmoc7182]

Yes à switchable rectification could be interesting, but it’s too late for me. May be Ez80 in place of Gz34 ? Anyway, thank for your nice comment.

[@MickMod]

Thanks for the great information! That soldering and assembly is probably the best I've ever seen, beats a lot of the equipment I worked on in the navy!

[@crisetmoc7182]

Thanks

[@peteytwofinger]

man oh man , you should be very proud of your hard work and the level of craftsmanship you have displayed is a thing of wonder . Hats off pal .

[@crisetmoc7182]

Thanks a lot You are too kind

[@MrAlanGNR]

It is the most perfect amplifier I have seen, incredible work, congratulations

[@crisetmoc7182]

Thanks !

[@gerardlechevallier5667]

Salut Cris J'ai eu le privilège d'écouter cet ampli Le son qui en sort est juste parfait Marshall est dépassé Genialissime

[@Green_House]

Your build quality is in on a whole other level ! ! ! I have never seen anything like this. 👍👍👍 Congratulations!

[@crisetmoc7182]

Thanks !!!

[@BenState]

I agree, as an ex avionics engineer, this is drool

[@Someguy-ic3mu]

A jcm 800 for the bedroom! Love It!

[@stephenhill8991]

Beautiful internal construction (wire runs, layout + solder job) A+!

[@jamiemascola6614]

Beautiful work. I am unapologetically impressed.

[@crisetmoc7182]

Thanks 🙂👍

[@AuntAlnico4]

That is premium build but let's hear what a guitar sounds like with it 😉

[@crisetmoc7182]

I will reccord a demo soon 👍

[@alexfarmer9051]

@@crisetmoc7182 still making this demo?

[@larrysteinke1839]

great idea to have the internal speaker in a "head" format. at this power it would be easy and useful to add an internal load and line out for silent recording too.

[@rangerdoc1029]

Hmmmm. Wonder what it actually sounds like. ; |

[@Mark_of_the_Bear_Studios]

WHERE CAN I FIND THIS THING?!!!! Your build is a thing of beauty!!!

[@crisetmoc7182]

Thanks

[@worldwide_will]

Brilliant. Just brilliant. Now I want one.

[@crisetmoc7182]

You have just to do it ! ´

[@tarasbou]

@@crisetmoc7182 ok, but comment on fait? is there a moyen to récupère the schématic of the bouzin??

[@crisetmoc7182]

@@tarasbou A la fin de la vidéo je donne l'adresse de 4 sites qui m'ont aidé à réaliser ce bouzin. En fait il s'agit d'un JTM800 dans lequel le push pull de pentodes à été remplacé par un push pull de triodes pour le ramener à 1Watt. Vous pouvez trouver les plans de la version originale sur le site "thetubestore.com/marshall-schematics", la version modifiée 1W sur "robrobinette.com", la grande majorité des composants vient de chez TubeTown.com

[@tarasbou]

@@crisetmoc7182 Merci pour les infos. Et bravo, le résultat est impressionnant

[@qddk9545]

A fantastic build job, but not worth a lot without sound examples. I am very interested in how close one can come to the real deal with low wattage tubes. And the work is almost the same as building a 15 - 50w amp.

[@crisetmoc7182]

I will try to make a clip, many people ask me for that. It s true it s a lot of work for few watts. But it was an esthetic exercise during the covid time in 2020.

[@I_Medvedev]

Cable management porn right there! amazing job!

[@sweetmusicmedicine]

I"ve built a Champ amp 5 watt and Princeton Reverb, 12 watt and I'm bitten by the bug. Where do I find the schematic and perhaps a chassis layout?

[@crisetmoc7182]

Send me your email at ccomte78 at gmail.com. I will send you schematic and layout.

[@wigzme2717]

can i ask how much all the electrical parts cost? thanks, awesome looking thing!

[@eldark2b]

bonjour merci pour la vidéo !quelle magnifique construction ouaou!merci beaucoup pour la vidéo

[@crisetmoc7182]

Merci, c est très gentil de votre part, c est un plaisir pour moi.

[@eldark2b]

c est le clone 1watt marshall qui était sorti pour l anniversaire?ou c'est le robrobinet 1watt? pack depuis que j ai vu votre vidéo je le veux mdrrrr donc je me documente!j ai du voir la vidéo une bonne dizaine de fois mdrrr bonne journée à vous

[@eldark2b]

@@crisetmoc7182 bonjour monsieur depuis l autre jours je regarde sans cesse la vidéo pourriez vous svp partager le layout?

[@crisetmoc7182]

Bonjour, qu’ appeler vous le layout, le schéma ? Le probleme c est que je n ai pas de blog, mais si vous me donné vos coordonnées e-mail je peux vous l envoyer. Il s’agit vraiment du JTM800 avec un push-pull de triodes à la place des pentodes. D’où la modification des charges d anodes et de cathodes de celles ci. Autres motifs, le passe haut, le passe bas, les 3 positions de clipper et le master volume. Je reste à votre disposition, dite moi comment vous l envoyer.

[@crisetmoc7182]

Pour répondre à l autres question, ce n est pas le Marshall anniversaire 1w, c est plutôt le Rob Robinette

[@thywarhag1131]

Sweet 👌👌👌

[@AndewKu]

Красивый монтаж 👍🏻👍🏻👍🏻

[@crisetmoc7182]

Thanks, but I dont understand 😳😁

[@jernejkurincic9050]

@@crisetmoc7182 Something in the lines of "great assembly", i just google translated it myself. Beau montage, if the google is not wrong.

[@jernejkurincic9050]

I am totally astounded! Such beauty and mastery! Been just thinking those days about running heater wire on top of chassis (I write wire because I thought of making it DC and running just the positive on wire and negative through the chassis). And the "curtain" between the power and signal section ... Still I wonder: why just 1W? Isn't that an original PT? And why so much heater wiring?

[@jernejkurincic9050]

Another note: All the tubes you use have a 12,6V heater. You could use 12,6 heater and so the wiring can be much thinner

[@crisetmoc7182]

Continuous heating is a great idea. In this case, it is not even necessary to remove the "wire" from the outside of the chassis. I have many amps from 40W to 5W, the 1W was missing in the collection : +) ... and 1W is really efficient in my home. I wanted everything to be perfectly accessible and clear. For reasons of space, the star distribution of the 6.3 is off-center, hence the idea of ​​the cable duct for the heating. I really enjoyed making this amp during the first confinement in the spring of 2020. I don't understand "Isn't that a PT"?

[@crisetmoc7182]

​@@jernejkurincic9050 It is true in this case I had only to feed through pins 4 and 5 and a single drilling of the chassis would have been enough. But the radiation is proportional to the voltage :+) !

[@jernejkurincic9050]

@@crisetmoc7182 PT stands for "power transformer", opposed to OT, which is "output transformer". I was just trying to say you have wasted a looot of power for atiny little amp, but now I get it.

[@possumcode]

Great video!

[@jasonkirkham550]

Nice job !

[@crisetmoc7182]

Thanks

[@crisetmoc7182]

Thanks

[@antonix_81]

great build ! i love the layout! in my next build i want to use 2 ecc82 in the power section , parallel/push pull , maybe it will be around 2/3 watts 😁😁

[@crisetmoc7182]

Thanks, your push pull project with two ecc82 is interesting. What kind of dephasor you will use. Keep me informed 👍

[@antonix_81]

@@crisetmoc7182 do you mean phase inverter? ecc83/12ax7 , i depends what circuit i will build , probably i'm using a cathodyne if i'm building a small 5e3 , or something like a princeton (still have to think what to do with the extra triode) , otherwise a ltp and probably it will be like a small marshall lite, kind of another good option are small pentodes like el91 , but it's difficult to find proper power transformer

[@zbaby82]

I would have liked to have heard it. And beware of those IC capacitors.

[@crisetmoc7182]

@Zack Baines What experience have you with these capacitors IC ?

[@pahaahv]

You could probably substitute the clipper switch with a 50K pot?

[@crisetmoc7182]

Be care, the DC would be present on the potentiometer and its power could be critical. It will be better to use a variable power resistor with a least a power of 2watts. Be care also to big noises « CRACKS » in the loudspeaker.

[@pahaahv]

@@crisetmoc7182 Ahh, then a better solution still is the switch. Obvious! Thank you!

[@trefwoordpunk2225]

Cracking music. And that amp looks amazing, very nice clean build, just a shame its only 1 watt. This quiet revolution is NOT for me! I thought we'd have 1000 watt guitar amps by now! 100 watt amps were too quiet in the 70s

[@larrysteinke1839]

we have PAs for that these days. 20 or 30 watts is plenty enough for most situations and 1 "good" watt is plenty enough for home and studio. you can also slave the output of such a low watt amp to some other "house" amp stack set on clean.

[@larrysteinke1839]

mind you, for almost the same cost and effort i would have used a bigger OT like 125D or 125E because the 270DX PT should support EL84s to give 15 watts. then add some power scaling or built in attenuator load to give an option for 1 watt, then you have some more flexibility.

[@crisetmoc7182]

It is true that there was the possibility of doing more economical. But for me this construction is an exercise in style and I really enjoyed myself. Thanks for your comments

[@larrysteinke1839]

@@crisetmoc7182 yes, very nice work. 👍

[@peteytwofinger]

@@larrysteinke1839 my music teacher in 4th grade was Mr Steinke - he would play piano and got angry that the kids didnt sing . He was great , very old . i remember this kid steve and i had a crawfish race on his desk as the guy was kind of old and couldnt see very well . He saw those lobsties and picked steve up off his chair by the EAR ! steve was grabbing his arm but still . they fired him for that . old steinke , i missed him , he used to let us bring records in and play a few songs . Some kid brought in KISS and wow me AND steinkey didnt care for that at all . another kid brought in pink floyd and Steinkey loved it , he had his ear crammed up by the speaker listening for sound efffects , talking about "elements of music concrete" . so cool . anyway when ever i see someone with your name i always grin and remember "red river valley" , that guy was a true american classic old Steinke .

[@mobicus1]

Incredible!

[@psyolent.]

Cris awesome work mate and video, where did this kit come from please?

[@crisetmoc7182]

Thanks Greg, it is not a commercial kit, it is a personal work. I can send you the schematics and the overlay if you give me your e-mai.

[@russellesimonetta3835]

Yeah I had to watch. 1 watt marshall 800? I knew RobRobbinett had someting to do with it!

[@crisetmoc7182]

Yes ! Robrobinette had something to do this it, I saw a lot of time robrobinette.com, it is a very clear tutorial for valves amplifier. Do you have valve project ?

[@rangerdoc1029]

I'm dying to make his micro SLO.

[@alexfarmer9051]

please can you make a sound clip, im sure there are lots of people who will appreciate it :)

[@crisetmoc7182]

Yes, I will try to do that, thanks for your suggestion

[@alexfarmer9051]

How’s it coming along

[@neolllllllll5137]

Wow c'est superbe !!!😍😍😍

[@crisetmoc7182]

T es musicienne ?

[@neolllllllll5137]

@@crisetmoc7182 Non je suis pas musicienne !!

[@dumitrubaluta7058]

very beautiful

[@crisetmoc7182]

Thanks

[@zhou_sei]

do you have any sound clips?

[@DemonKingOFFICIAL]

Amazing work. It’s a piece of art. Did you design the circuit as well? Sure it’s a JCM800… but there are clear differences in the preamp as well as the output section, of course.

[@crisetmoc7182]

The design of the mod is inspired by robrobinette.com The mod in the preamp is optional with three switches: "Loudness", "Bright" and "Clipper". But each switch has a conventionnel position which respect the schematic of the JCM800 Effectively for the output section the ECC82 replaces the 2 EL34.

[@joerivera3222]

Where do I get the board from

[@zks-dr3oi]

hola estimado me gusto el diseño quiero armar algo así para ensayar en mi dormitorio. Como puedo obtener el diagrama..

[@crisetmoc7182]

Donnez moi votre adresse e-mail , je vous le enverrai

[@zks-dr3oi]

@@crisetmoc7182 hola estimado revise mi correo y aun no me ha enviado el diagrama...disculpe por molestar pero se lo agradecería. Saludos

[@crisetmoc7182]

@@zks-dr3oi Give me your email

[@zks-dr3oi]

@@crisetmoc7182 gracias master por los archivos...

[@pacquetman]

Awesome workmanship, Cris! Where might someone find that schematic?!

[@crisetmoc7182]

You can find the schematic in « robrobinette.com »

[@2bad4unme]

Would it be a big change to modify this design to a 5 watt version?

[@crisetmoc7182]

Yes it be a big change cause the 1w is obtain by one double triode push pull. I don’t know a triode allowing to obtain 2 x 2,5W. It necessary to have one tube more (one more hole in the chassis) But PT and OT allows 15W

[@crisetmoc7182]

Or to find a double triode 2 x 5 watts

[@crisetmoc7182]

Ecc99 allows to obtain 5w with very few modifications. Maybe I will try to see

[@patrickdesalmand4942]

beau travail, pourrais-je avoir le plan svp

[@crisetmoc7182]

Bonjour, bien sûr Donnez moi vos coordonnés

[@crisetmoc7182]

Utilisez « at » à la place de l arobase

[@kristopher6031]

Beautiful

[@fonshoamps]

Deseo armar uno, puedes compartir el archivo por favor?

[@crisetmoc7182]

Give me your email and I will send it

[@juanh9350]

What did you separate with the brass plate ?

[@crisetmoc7182]

The power suply radiats 50 or 60Hz in audio and induce rumble. A shield is welcome between this two parts. For the same reason the heating 6.3V is wiring upper the chassis.

[@TheChadPad]

@@crisetmoc7182 Would this benefit at all a traditionally built super lead amp? Or is it set up in a way that it's unnecessary? Building one and wondered if this trick would help

[@crisetmoc7182]

@@TheChadPad Regarding the shielding plate and the external path for the heating? It's true that for me building this amp was an exercise in style. But I didn't do anything for free. The separation of the 6.3v AC power and heating part from the preamp part is very effective against 50Hz or 60Hz hum. In the past some guitar amps were built with two separate chassis, one for the audio part and another for the power supply part. Nowadays some manufacturers supply the heaters of the preamp tubes with DC

[@renemikkers6404]

Very strange to see your turret board location on top of the chassis

[@crisetmoc7182]

This turret board is the HT power. It’s better to separate it from the audio signal amplifier because the hum

[@nerddujugement8334]

that needs to change some "composant" values - on voit les Français xD

[@ViaticalTree]

All that and we don’t even get to hear what it sounds like. 🤦‍♂️

[@crisetmoc7182]

I will do that.